Payne PG8MAA Error Code 12: Blower On After Power Up
What Does Code 12 Mean?
Status code 12 on the Payne PG8MAA indicates that the blower motor ran for 90 seconds as a safety precaution because power was restored while the thermostat was actively calling for heat (R-W circuit was closed). This is completely normal and not an error condition.
When the furnace loses power during a heating cycle, residual heat remains in the heat exchanger. The control board is designed to run the blower for 90 seconds upon power-up in this situation to dissipate that residual heat safely before starting a new heating cycle. This same code can also appear if the thermostat's R-W circuit opens during the blower on-delay period.
The furnace will resume normal operation automatically after the 90-second blower cycle completes. If the thermostat is still calling for heat, a normal heating sequence will begin. No action or service is required.
Common Causes
| Cause | Likelihood | DIY? |
|---|---|---|
| Power was restored while the thermostat was calling for heat | Most common | — |
| Brief power outage during a heating cycle | Common | — |
- No professional service is needed for this status code unless it appears repeatedly without any power interruptions
Sources
✓ Verified against manufacturer service manual — March 2026