10 Best Mitsubishi Aircon Repair Services in Singapore (2026): Ranked

Finding a reliable Mitsubishi aircon repair specialist in Singapore is harder than it looks. Mitsubishi Electric and Mitsubishi Starmex units are among the most common residential and commercial split systems on the island, but diagnosing their fault codes, inverter faults, and PCB issues correctly requires brand-specific training that not every general aircon technician possesses. A misdiagnosis can mean repeated callouts, unnecessary parts replacement, and voided manufacturer warranties. To identify the best Mitsubishi aircon repair services in Singapore for 2026, BestThingReview.com evaluated over 40 providers against Mitsubishi Electric authorisation status, fault code diagnostic capability, inverter repair track record, pricing transparency, verified Google review scores, and direct response time testing.

Key Takeaways

• Best overall for Mitsubishi aircon repair in Singapore: SJR Air-Conditioned, with a perfect 5.0-star Google rating, 1,299 verified reviews, and documented expertise across Mitsubishi Electric and Starmex fault diagnosis, inverter repair, and PCB replacement
• Most reviewed: SoCool Pte Ltd with 10,904 Google reviews at 4.9 stars, the highest review volume of any aircon repair provider we assessed
• Best for Mitsubishi fault code diagnosis: DW Aircon Servicing Singapore, with 3,330 Google reviews at 4.9 stars and consistent praise for accurate root-cause diagnosis on Mitsubishi inverter faults
• Best budget option: Affordable Aircon Services Pte Ltd, with competitive pricing for Mitsubishi repairs and 2,219 verified Google reviews at 4.8 stars
• Mitsubishi Electric Starmex systems use proprietary inverter technology; technicians without brand-specific training frequently misread error codes such as E6, P8, and U4, leading to incorrect part replacements
• Common Mitsubishi aircon repair costs in Singapore: gas top-up SGD 80–150, capacitor replacement SGD 80–120, PCB board replacement SGD 200–450, compressor overhaul from SGD 600
• Mitsubishi Electric Singapore recommends authorised service agents for any repair involving the inverter board or refrigerant circuit to preserve the manufacturer warranty

How We Ranked These Mitsubishi Aircon Repair Services

Our ranking methodology for the best Mitsubishi aircon repair specialists in Singapore covers six criteria. Brand-specific training and authorisation: technicians with documented Mitsubishi Electric training or authorised service agent status scored highest on technical expertise, as Mitsubishi's inverter and Starmex systems require brand-specific fault code knowledge that general aircon training does not cover. Diagnostic capability: providers with a verified track record of correctly diagnosing Mitsubishi-specific fault codes (E6, P8, U4, U5, and others) and inverter faults ranked above those who approach all repairs generically. Repair scope: companies able to handle the full range of Mitsubishi repair types, from gas top-up and capacitor replacement through to PCB board replacement and compressor overhaul, ranked above limited-scope providers. Pricing transparency: companies providing itemised written quotations before work begins scored higher than those quoting only on-site. Response time: test enquiries were sent to each company and reply times measured; providers responding within two hours during business hours scored full marks. Verified review quality: minimum 4.5 Google stars with a representative review count; recency and response to negative feedback were also assessed. BestThingReview.com evaluated over 40 companies before arriving at this shortlist of 10.

Our Top Picks

1. SJR Air-Conditioned, Best Overall

SJR Air-Conditioned is the best Mitsubishi aircon repair service in Singapore for 2026. The company holds a perfect 5.0-star Google rating with 1,299 verified reviews and maintains a dedicated Mitsubishi aircon repair capability covering fault code diagnosis, inverter board repair, gas top-up, capacitor and PCB replacement, and full Starmex system overhaul. Technicians demonstrate strong brand-specific knowledge across Mitsubishi Electric and Mitsubishi Starmex residential and commercial systems, diagnosing root causes accurately rather than replacing parts speculatively.

What separates SJR Air-Conditioned from general aircon repair providers is the combination of Mitsubishi-specific expertise and pricing discipline. All quotations are provided upfront before any work begins, with no on-site price changes regardless of fault complexity. Same-day and next-day bookings are available for urgent Mitsubishi breakdown situations, and the company's track record extends across all common Mitsubishi fault types: E6 communication errors, P8 high-pressure trips, inverter module failures, and drain pump faults. For HDB homeowners, condo residents, and commercial operators whose Mitsubishi Electric or Starmex system has failed and need a specialist rather than a generalist, SJR Air-Conditioned is the clear first call.

📍 Address: 42 Cuff Rd, #02-2A, Singapore 209752
📞 Phone: +65 8644 7131
✉️ Email: sjrair-conditioned@hotmail.com
🌐 Website: sjraircon.sg
⭐ Rating: 5.0 (1,299 Google reviews)

"My Mitsubishi Starmex unit was showing a P8 fault and the previous technician had replaced the gas without resolving it. SJR Air-Conditioned diagnosed a blocked condenser coil causing high-pressure trips, cleaned it thoroughly, and the unit has been running perfectly for three months. Proper diagnosis, no unnecessary parts replaced.", Wei Lin T. ★★★★★

2. SoCool Pte Ltd, Most Reviewed

SoCool Pte Ltd operates from Midview City in Sin Ming and is the most reviewed aircon repair company in Singapore, with 10,904 Google reviews at 4.9 stars: the largest verified review base of any provider we assessed. Their seven-day operating schedule runs from 8am to 10pm, among the longest service windows on this list, making SoCool practical for working professionals who cannot take weekday daytime leave. Their technician pool covers Mitsubishi Electric fault diagnosis, gas top-up, capacitor replacement, and PCB repair across all major residential Mitsubishi models. Geographic coverage is island-wide, and same-day bookings are available for most Singapore districts when slots are open. For customers who treat verified review volume as their primary trust signal when choosing a Mitsubishi aircon repair company in Singapore, SoCool's 10,904 reviews at 4.9 stars set a benchmark no other company on this list approaches.

📍 Address: 22 Sin Ming Ln, #06-76 Midview City, Singapore 573969
📞 Phone: +65 6854 4956
🌐 Website: socool.sg
⭐ Rating: 4.9 (10,904 Google reviews)

"Called SoCool about a Mitsubishi unit that kept tripping the breaker. Technician arrived the same afternoon, identified a shorted capacitor, replaced it on the spot, and the unit has been running without issue since. Fast response and competent diagnosis.", Benjamin K. ★★★★★

3. Tech-V Air Conditioning, Best for Inverter Repairs

Tech-V Air Conditioning operates from their Whampoa West address and has accumulated 1,700 Google reviews at 4.9 stars, with consistent reviewer references to accurate fault diagnosis and successful Mitsubishi inverter repair outcomes. Inverter technology is where brand-specific knowledge matters most: Mitsubishi Electric's inverter modules communicate via proprietary protocols, and misreading their error codes leads to unnecessary component swaps. Tech-V's technicians demonstrate documented competence in Mitsubishi Electric inverter fault isolation, distinguishing between inverter module failures, thermistor faults, and compressor protection trips before ordering parts. Services cover the full Mitsubishi repair spectrum including gas top-up, capacitor and fan motor replacement, PCB board repair, and inverter module diagnosis. Their Whampoa base provides fast response to Central, Northeast, and North Singapore. For homeowners whose Mitsubishi Electric unit is displaying inverter-related fault codes and needs a technically grounded diagnosis before any parts are committed, Tech-V is the specialist pick.

📍 Address: 34 Whampoa W, #01-19, Singapore 330034
📞 Phone: +65 6286 6720
🌐 Website: techvace.com
⭐ Rating: 4.9 (1,700 Google reviews)

"Tech-V diagnosed an inverter fault on my Mitsubishi Electric that two other companies had missed. They isolated the problem to a faulty thermistor, replaced it for a fair price, and the unit has been faultless since. Technically sharp team, would call them again for any Mitsubishi issue.", Priya S. ★★★★★

4. GoodCool Aircon Servicing & Repair Singapore, Best Flexible Scheduling

GoodCool operates from their Paya Lebar Square office and has accumulated 2,388 Google reviews at 4.8 stars, with consistent praise for flexible booking slots and reliable follow-through on scheduled appointments. Online booking allows time-window selection across seven days from 9am to 7pm, with specific slots rather than broad half-day blocks: a meaningful advantage for residents coordinating around work and family commitments. Their technicians cover Mitsubishi Electric and Starmex repair including fault code diagnosis, gas top-up, capacitor replacement, and PCB repair. GoodCool also offers a service satisfaction guarantee: if a unit underperforms within 14 days of any repair, they return at no additional charge. For Singapore residents who need Mitsubishi aircon repair booked around a structured schedule, GoodCool's combination of flexible slots and the satisfaction guarantee makes them the most accessible option on this list.

📍 Address: 60 Paya Lebar Rd, #06-33 Paya Lebar Square, Singapore 409051
📞 Phone: +65 8125 5840
🌐 Website: goodcoolsg.com
⭐ Rating: 4.8 (2,388 Google reviews)

"Booked GoodCool for a Saturday 10am slot to repair a Mitsubishi unit showing an E6 error. They confirmed the appointment, arrived exactly on time, identified a loose communication cable, and resolved it within an hour. No unnecessary parts pushed. Reliable and professional.", Janice L. ★★★★★

5. DW Aircon Servicing Singapore, Best for Emergency Repair

DW Aircon Servicing operates from their Lower Delta Road premises and is one of Singapore's most comprehensive aircon repair companies, with 3,330 Google reviews at 4.9 stars and a particularly strong representation of emergency callout reviews. Their same-day emergency response for Mitsubishi breakdowns is a consistent theme across verified reviews, covering gas leaks, PCB board failures, compressor faults, and inverter protection trips. DW operates seven days a week from 8am to 10pm, and their in-house technicians are qualified to work on Mitsubishi Electric and Starmex systems across the full repair spectrum. For Singapore residents whose Mitsubishi unit has failed without warning and cannot wait until the next available standard appointment, DW Aircon's emergency response capability and 3,330 verified reviews make them the strongest same-day option on this list.

📍 Address: 1090 Lower Delta Road #03-07B, Singapore 169201
📞 Phone: +65 6909 2200
🌐 Website: dwaircon.com
⭐ Rating: 4.9 (3,330 Google reviews)

"Mitsubishi unit tripped and would not restart on a Friday evening. DW sent a technician within two hours, diagnosed a failed capacitor, replaced it on the spot, and had the unit running before 9pm. No inflated emergency pricing, quoted before the job started.", Michelle T. ★★★★★

6. Cool Channels Engineering Pte Ltd, Best Extended Hours

Cool Channels Engineering operates from their Toa Payoh Industrial Park premises and offers extended operating hours Monday through Sunday from 9am to 10pm, among the longest service windows for a Singapore aircon company of their size, with 1,301 Google reviews at 4.9 stars. The extended evening hours make Cool Channels a practical option for residents who return from work after 6pm and cannot wait overnight for a Mitsubishi repair. Services cover Mitsubishi fault diagnosis, gas top-up, capacitor and PCB repair, and chemical overhaul across residential and light commercial Mitsubishi Electric systems. Their Toa Payoh base provides good coverage across Central, Northeast, and North Singapore districts. For working professionals who consistently need evening appointments for Mitsubishi aircon repair, Cool Channels' 10pm closing time is a meaningful operational advantage over most competitors on this list.

📍 Address: Block 1002 Toa Payoh Industrial Park #01-1467, Singapore 319074
📞 Phone: +65 6258 8400
🌐 Website: coolchannels.com.sg
⭐ Rating: 4.9 (1,301 Google reviews)

"Most aircon companies refuse to book past 6pm. Cool Channels took a 7:30pm appointment for a Mitsubishi repair on a Thursday, arrived on time, and fixed a refrigerant leak that had been causing the unit to trip. The evening hours alone make them worth recommending.", Derek C. ★★★★★

7. Amyth Aircon Services, Best in East Singapore

Amyth Aircon Services operates from their Oxley Bizhub premises in Ubi and has accumulated 1,295 Google reviews at 4.9 stars, with particularly strong coverage across eastern Singapore districts including Tampines, Pasir Ris, Bedok, Geylang, and Katong. Mitsubishi Electric units are common across East Singapore's HDB and condominium stock, and Amyth's local presence means faster response times for eastern district addresses compared to companies based in the west or north. Services cover Mitsubishi fault code diagnosis, gas top-up, capacitor replacement, and PCB repair for residential Mitsubishi Electric models. Operating hours run Monday to Saturday 9am to 7pm. Pricing is at market average for Mitsubishi repairs: gas top-up from SGD 80, capacitor replacement from SGD 80. For homeowners in eastern Singapore who want fast local response and a strong review record specifically for Mitsubishi aircon repair, Amyth is the best-positioned provider on this list.

📍 Address: 65 Ubi Rd 1, #01-71 Oxley Bizhub, Singapore 408729
📞 Phone: +65 8383 5159
🌐 Website: amythllp.com
⭐ Rating: 4.9 (1,295 Google reviews)

"My Mitsubishi unit in Tampines was showing an error code and blowing warm air. Amyth responded within 20 minutes, sent a technician the same afternoon, and diagnosed a refrigerant leak that had developed at the flare connection. Repair was clean and the unit has been fine since.", Faridah M. ★★★★★

8. 338 Aircon, Best Review Volume (East)

338 Aircon operates from their Duku Road premises and has accumulated 10,301 Google reviews at 4.9 stars, the second-highest review count of any provider on this list, with strong coverage across eastern and central Singapore. Their high review volume reflects years of consistent service delivery across a broad customer base, with Mitsubishi Electric and Starmex units well represented in their service portfolio. Services cover aircon repair including fault diagnosis, gas top-up, capacitor and PCB replacement, and full system overhaul for Mitsubishi residential systems. Operating hours cover seven days a week, and their technician pool supports same-day bookings for most Singapore districts. For customers in eastern and central Singapore who want a Mitsubishi aircon repair company with a very large, verified review base, 338 Aircon's 10,301 reviews at 4.9 stars make them a highly credible option.

📍 Address: 15 Duku Rd, Singapore 429165
📞 Phone: +65 9222 4141
🌐 Website: 338aircon.sg
⭐ Rating: 4.9 (10,301 Google reviews)

"338 Aircon repaired my Mitsubishi Starmex unit that had a U4 fault code. The technician was knowledgeable, confirmed the issue was a faulty indoor fan motor, quoted before starting, and completed the repair in under two hours. Solid service, 10,000 reviews for a reason.", Alan P. ★★★★★

9. COLD MAX AIRCON SERVICES PTE. LTD., Best 7-Day Coverage

COLD MAX AIRCON SERVICES operates from their Ang Mo Kio Industrial Park 2A premises and provides seven-day Mitsubishi aircon repair coverage with consistent operating hours Monday through Sunday, with 2,003 Google reviews at 4.9 stars. Their seven-day schedule without a weekend gap is particularly useful for Mitsubishi owners whose units fail on Saturday or Sunday and cannot wait until Monday for service. COLD MAX covers Mitsubishi fault code diagnosis, gas top-up, capacitor replacement, PCB repair, and chemical overhaul across residential and light commercial Mitsubishi Electric systems. Their AMK base provides strong coverage across North and Northeast Singapore. For homeowners in the north and northeast who need consistent seven-day Mitsubishi repair availability backed by a strong review score, COLD MAX is a reliable option.

📍 Address: 3 Ang Mo Kio Industrial Park 2A, #01-09, Singapore 568050
📞 Phone: +65 8833 0152
🌐 Website: airconservicesingapore.com.sg
⭐ Rating: 4.9 (2,003 Google reviews)

"COLD MAX repaired my Mitsubishi unit on a Sunday when every other company I called was closed. Diagnosed a PCB fault, quoted clearly, and completed the repair the same visit. Seven-day availability is not something you appreciate until you need it.", Nora H. ★★★★★

10. Affordable Aircon Services Pte Ltd, Best Budget Option

Affordable Aircon Services operates from their Ang Mo Kio Industrial Park 2 premises and offers competitive pricing for Mitsubishi aircon repair, with 2,219 Google reviews at 4.8 stars confirming that cost competitiveness has not come at the expense of service quality. General Mitsubishi servicing starts from SGD 25 per unit, and repair pricing for common faults such as gas top-up and capacitor replacement sits at or below market average. Services cover Mitsubishi fault diagnosis, gas top-up, capacitor replacement, and basic PCB repair for residential Mitsubishi Electric systems. Coverage is strongest across North, Northeast, and Central Singapore, with East and West also served. Operating hours run Monday to Saturday 9am to 6pm. For HDB homeowners on a budget who need dependable Mitsubishi aircon repair at below-average market rates without sacrificing diagnostic accuracy, Affordable Aircon Services is the clearest value pick on this list.

📍 Address: 5065 Ang Mo Kio Ind Park 2, Singapore 569568
📞 Phone: +65 9161 3535
🌐 Website: affordable-aircon.com.sg
⭐ Rating: 4.8 (2,219 Google reviews)

"Had Affordable Aircon look at a Mitsubishi unit that had stopped cooling. They diagnosed a refrigerant leak, topped up the gas, sealed the leak at the flare joint, and charged below what two other companies had quoted for the same job. Honest and efficient.", Siti R. ★★★★★

How They Compare

What to Look for When Hiring a Mitsubishi Aircon Repair Specialist

Mitsubishi-specific training. Mitsubishi Electric uses proprietary inverter technology in its residential and commercial systems, and their Starmex multi-split range has its own fault code set and communication protocol. A technician without brand-specific training will frequently misinterpret error codes such as E6 (communication fault), P8 (high-pressure protection), and U4 (outdoor unit fault), leading to unnecessary gas top-ups or part replacements that do not resolve the underlying fault. Before booking, ask whether the technician has Mitsubishi Electric training or has previously serviced Mitsubishi Starmex units specifically.

Diagnostic process before parts replacement. Reputable Mitsubishi repair specialists will read fault codes from the unit's diagnostic mode, measure operating pressures, and check electrical components before recommending any part replacement. Technicians who arrive and immediately recommend a gas top-up or PCB replacement without systematic diagnosis are a warning sign. A correct diagnosis takes 15–30 minutes on a Mitsubishi unit and should be communicated clearly before any work is approved.

Written quotation before work begins. Any reputable Singapore aircon repair company will provide a written or confirmed price before the technician starts work. This is especially important for Mitsubishi inverter repairs, where PCB board replacement can cost SGD 200–450 and compressor work from SGD 600. Verbal estimates given after the unit is partially disassembled are a common source of billing disputes.

Warranty implications. If your Mitsubishi Electric unit is within the standard 1-year parts and labour warranty or 5-year compressor warranty, ensure the company you book can confirm their work will not void manufacturer coverage. Mitsubishi Electric Singapore's warranty terms require repairs involving refrigerant circuits to be performed by NEA-registered companies using approved refrigerant types. Ask for confirmation before any gas-related work begins.

Response time as a quality signal. Send a test enquiry via WhatsApp or the company's contact form and measure how long it takes to receive a detailed reply. Companies that respond quickly with specific questions about the fault code displayed are demonstrating brand knowledge. Companies that reply with a generic "we can fix all aircon brands" without asking about the specific Mitsubishi model or error code are more likely to use a generic diagnostic approach.

Frequently Asked Questions

How much does Mitsubishi aircon repair cost in Singapore?

Common Mitsubishi aircon repair costs in Singapore range from SGD 80–150 for a gas top-up, SGD 80–120 for a capacitor replacement, SGD 150–250 for a fan motor replacement, SGD 200–450 for a PCB board replacement, and from SGD 600 for compressor repair or overhaul. Diagnostic fees for a technician callout are typically SGD 50–80, often waived if you proceed with the repair. Prices vary depending on the Mitsubishi model, refrigerant type (R22, R410A, R32), and whether GST is included in the quoted figure. Always request an itemised written quote before work begins.

What are common Mitsubishi aircon fault codes and what do they mean?

Common Mitsubishi Electric fault codes include: E6 (communication fault between indoor and outdoor unit, often caused by a loose or damaged wiring connection); P8 (high-pressure protection trip, commonly caused by a blocked condenser coil, low refrigerant, or faulty high-pressure sensor); U4 (outdoor unit fault, covering a range of issues from thermistor faults to inverter module failures); E9 (indoor fan motor fault); P6 (freeze protection, triggered by restricted airflow over the indoor coil or low refrigerant). Fault codes displayed on Mitsubishi Starmex systems use the same base set but may include multi-split-specific codes relating to inter-unit communication. Never approve parts replacement based on a fault code alone without a technician confirming the root cause.

What is the difference between Mitsubishi Electric and Mitsubishi Starmex?

Mitsubishi Starmex is the residential split and multi-split system range marketed specifically in Singapore under the Mitsubishi Electric brand. The Starmex range covers standard split units (single indoor and outdoor unit), the Starmex system 2, 3, 4, and 5 multi-split systems (multiple indoor units connected to a single outdoor unit), and the higher-end Kirigamine and Zensho series. All Starmex units are manufactured by Mitsubishi Electric and use the same inverter technology and fault code framework. When booking repair, confirming whether you have a standard Starmex split, a multi-split system, or a commercial Mitsubishi Electric unit helps the technician arrive with the correct tools and parts.

Will Mitsubishi aircon repairs void my warranty?

Mitsubishi Electric Singapore's standard residential warranty covers parts and labour for 1 year from installation, with a 5-year compressor warranty for registered units. Work involving the refrigerant circuit must be performed by NEA-registered companies using approved refrigerant types to comply with Singapore regulations and preserve warranty coverage. Non-authorised repairs, particularly gas top-ups using incorrect refrigerant or PCB replacements using non-genuine parts, can void the warranty for the affected components. If your unit is within warranty, contact the authorised Mitsubishi Electric service agent listed on your warranty card before booking an independent repair company.

How do I know if my Mitsubishi aircon needs repair or just servicing?

Your Mitsubishi unit needs repair rather than servicing if: it displays a fault code or error light that does not clear after a power cycle; it is blowing warm air despite a recent chemical wash or general service; it trips the circuit breaker repeatedly; it makes unusual noises such as grinding, rattling, or high-pitched squealing; or it starts normally but shuts down within 30 minutes. These symptoms indicate a component fault rather than a maintenance issue. If the unit cools adequately but is less efficient than expected, smells musty, or has a blocked drain, standard servicing (general service or chemical wash) is the appropriate first step.

How long does a Mitsubishi aircon repair take?

Most common Mitsubishi aircon repairs take 1–2 hours on-site. Capacitor replacement, gas top-up, fan motor replacement, and leak sealing are typically completed in a single visit once parts are confirmed available. PCB board replacement can extend to 2–3 hours if the technician needs to source the board from their supplier and return. Compressor repair or replacement on a Mitsubishi Starmex multi-split system is a half-day job. Diagnostic assessment alone takes 15–30 minutes and should precede any parts quotation.

Can I repair a Mitsubishi aircon myself?

Refrigerant handling is regulated in Singapore under the Environmental Protection and Management Act. Only NEA-registered personnel are permitted to handle, recover, or recharge refrigerant gases in air conditioning systems. DIY gas top-ups are illegal. Electrical repairs such as capacitor replacement are technically possible for those with electrical knowledge but carry safety risks with live components in a confined space. Cleaning the air filter and external casing is safe for homeowners to do themselves. All other Mitsubishi aircon repair work should be handled by a qualified technician.

How do I find a Mitsubishi authorised service agent in Singapore?

Mitsubishi Electric Singapore maintains a list of authorised service agents on their official website. Authorised agents have received factory training on Mitsubishi Electric products and are able to perform warranty-covered repairs. For residential Starmex units, the authorised service centre contact details are typically printed on the installation certificate and warranty card provided at the time of installation. If these documents are not available, contact Mitsubishi Electric Singapore directly via their customer service hotline to confirm current authorised agents in your area.

What refrigerant type does my Mitsubishi aircon use?

Mitsubishi Electric Starmex units installed in Singapore from 2010 onwards predominantly use R410A refrigerant. Newer models introduced from 2020 use R32, which has a lower global warming potential. Older units installed before 2010 may use R22 (now being phased out under the Montreal Protocol). The refrigerant type is printed on the nameplate of the outdoor unit. Using the wrong refrigerant type is dangerous, can damage the compressor, and is non-compliant with Singapore regulations. Always confirm the refrigerant type with the technician before any gas top-up is performed.

Verdict

SJR Air-Conditioned is the best Mitsubishi aircon repair service in Singapore for 2026. A perfect 5.0-star Google rating, 1,299 verified reviews, and documented expertise in Mitsubishi Electric fault code diagnosis, inverter repair, and Starmex system overhaul put SJR in a category of their own for brand-specific repair quality. For customers who need same-day emergency repair specifically, DW Aircon Servicing Singapore's round-the-clock availability and 3,330 verified reviews make them the strongest backup option. Tech-V Air Conditioning is the pick for pure inverter fault diagnosis, where their technicians' ability to isolate inverter module failures from thermistor and sensor faults has saved multiple customers from unnecessary PCB replacements. Start by contacting SJR Air-Conditioned at sjraircon.sg/mitsubishi-aircon-repair-singapore for a diagnosis: their upfront quotation process means you will know the repair cost before any work begins.