Heat pump compressor repair in Toronto. Hard starts, tripped breakers, clanking, lukewarm air. Before anyone says “compressor,” we test whether it’s actually the compressor or the inverter board, because boards fail more often and cost less. Compressor work runs $800-$2,500. On an old R410A unit we price replacement alongside so you can decide with real numbers.
Is it really the compressor?
Often not. These failures look the same from the outside:
| Part | Symptoms | Typical fix |
|---|---|---|
| Inverter board | Fault codes, no compressor start | Board replacement |
| Start capacitor (fixed-speed units) | Hum, then breaker trip | Capacitor swap |
| Contactor | Clicking, no start, burnt contacts | Contactor swap |
| Scroll / inverter compressor | Locked rotor, shorted windings, loud mechanical noise | Compressor replacement |
We pull the fault codes, measure winding resistance and insulation to ground, check the board’s output to the compressor and compare running amps to locked rotor amps. Then we know.
Why do compressors fail?
- Short-cycling from an oversized unit, the most common one we see
- Low refrigerant from a slow leak, which overheats the compressor
- Contamination from a rushed original install with no deep vacuum
- Electrical stress from weak start components or loose connections
If the root cause isn’t fixed, the new compressor fails too. Sizing problems get a Manual J review. Leaks get found and fixed. See refrigerant leak repair.
How is a compressor replaced properly?
- Refrigerant recovered
- Old compressor cut out, new OEM compressor set
- Joints brazed under nitrogen to keep scale out of the system
- New filter drier installed
- Nitrogen pressure test, then a vacuum to under 500 microns
- Charge weighed in, startup readings logged
Skip any of these and the new compressor’s life gets shorter.
Will manufacturer parts coverage pay for it?
Maybe. We check the serial number against the registration and the manufacturer’s parts coverage terms. When it applies, we file the claim and you pay labour only. The Mill Pond job on this page was a six-year-old unit tripping its breaker. The inverter compressor was confirmed failed, the part was claimed, and the owner paid $1,450 in labour.
Repair or replace?
On an older R410A unit, put the compressor price next to a new heat pump replacement. If the unit is 12-15+ years old and the repair is a third or more of a new system, replacement usually wins. We write both down.
No heat right now? Call the 24/7 emergency line. Our Toronto heat pump techs run compressor diagnostics across Richmond Hill, Vaughan and the GTA. Or book a diagnostic through our general heat pump repair service.
