Technician diagnosing a fault at an HVAC control panel

AC and HVAC breakdown repair

If your unit has stopped, is showing an alarm or is not cooling, our breakdown line is open 24/7. Diagnosis first, then written approval, then repair.

In shortYOİ Mühendislik repairs PCB, sensor, refrigerant leak, fan, valve and compressor faults in all HVAC equipment, from split air conditioners to chillers. The emergency line is open 24/7; when you send a photo of the fault and the error code via WhatsApp, the team arrives with a preliminary diagnosis and the right parts.
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About breakdown repair

Most faults come from a single part, but the symptom shows up somewhere else. That is why diagnosis is done by measurement: pressure, current, temperature and superheat values are read and the error code is decoded. No repair work starts until you approve the cost.

Scope of service

  • Control board repair and replacement
  • Sensor, thermistor and transducer replacement
  • Refrigerant leak detection and repair
  • Fan motor, capacitor, contactor
  • Compressor testing, overhaul and replacement
  • Expansion valve and valve failures
  • Condensate pump and water leaks
  • Controller and communication faults
YOİ Mühendislik technician diagnosing a fault by measuring pressure on an outdoor unit
Faults are diagnosed by measurement, not guesswork.

From breakdown report to repair

  1. Send us the symptom, fault code and a photo via WhatsApp or phone
  2. The right parts and crew are planned based on a preliminary diagnosis
  3. On-site measurements provide an accurate diagnosis
  4. Repair cost is given in writing; work starts with your approval
  5. Post-repair measurements are reported

Buildings we serve

Home and officeHospitalData centerFactoryHotelShopping mall

Our base is in Ankara Etimesgut. We provide breakdown repair services daily in Ankara, and on a project and contract basis in all 81 provinces of Türkiye, including İstanbul, İzmir, Bursa, Antalya, Konya, Kayseri, Eskişehir, Kocaeli, Adana, Gaziantep, Samsun and Trabzon. See our service areas.

Frequently asked questions

Do you come out for breakdowns at night or on weekends?

Yes. Our emergency line is open 24/7; for critical facilities under contract, an on-call team and a written response time apply.

Is there a charge for fault diagnosis?

If you approve the repair, the diagnostic fee is deducted from the total cost.

Is there a parts warranty?

Replaced parts are subject to the manufacturer's warranty terms; we also provide a separate warranty on workmanship.

From 1 unit to 1,000 units, from a single provider.

Sales, installation, maintenance and repair for all brands and equipment. Nationwide across Türkiye.