ErrorCodePro · Appliance Error CodesRheem AC & Heat Pump Error Codes: Full List & Meanings
Every Rheem ac & heat pump error code we have verified against Rheem's own support pages, with its official meaning. This list covers rp16 heat pump defrost control (led 1 / led 2). Codes vary by model, so confirm in your owner's manual. Support: Rheem dealer (rheem.com).
Codes by system
Power supply
All Rheem ac & heat pump error codes
Codes marked "Reset only" or "Service" have no separate page because the manufacturer publishes no owner fix beyond a reset or a service call.
| Code | Official meaning | System | Owner action |
|---|---|---|---|
| LEDs off | Both LEDs are off: the control board has no power. | Power supply | Owner checks |
| ON / ON | The manufacturer lists ON / ON as: coil sensor failure. A licensed HVAC technician must diagnose this. | Sensors | Service |
| OFF / ON | The manufacturer lists OFF / ON as: ambient sensor failure. A licensed HVAC technician must diagnose this. | Sensors | Service |
| OFF / FLASH | The manufacturer lists OFF / FLASH as: low pressure lockout. A licensed HVAC technician must diagnose this. | Heating | Service |
| FLASH / ON | The manufacturer lists FLASH / ON as: high pressure control open. A licensed HVAC technician must diagnose this. | Heating | Service |
| FLASH / FLASH | Both LEDs flashing means normal operation. | Status / reminder | Service |
| Alternate flashing | The LEDs alternate during the 5-minute anti-short-cycle delay. This is normal. | Status / reminder | Service |
Symptoms
Sources
Last reviewed: October 20, 2026. ErrorCodePro is not affiliated with Rheem.