If your unit is running but blowing cool or cold air, follow the steps below to identify the cause and resolve the issue.
Before troubleshooting, confirm the following:
-
Unit is set to HEAT mode
- Set temperature is higher than the room temperature
- Unit has been running for at least 3–5 minutes
- Air filter is clean and not blocked
👉 If all of the above are correct, continue below.
This guide applies to:
- GC42 (42” PTAC)
- GCDM (32” PTAC)
Choose the type of heating your unit uses:
- Heat Pump (Hybrid: Heat Pump + Electric Backup)
- Electric Heat Only
-
Not sure? Click here → How to identify your heating type