Rheem Error Code P1
Over-voltage / under-voltage protection
Error Code Summary
| Brand | Rheem |
| Error Code | P1 |
| Meaning | Over-voltage / under-voltage protection |
| Cause | DC bus voltage out of normal operating range |
| Recommended Action | Check input voltage, rectifier circuit, DC bus capacitors |
How to Fix Rheem Error P1
- 1
Power Cycle the Unit
Turn off the unit at the breaker, wait 5 minutes, then restore power. Some errors auto-clear after a restart.
- 2
Identify the Issue
Error P1 means: Over-voltage / under-voltage protection. The most common cause is: DC bus voltage out of normal operating range.
- 3
Take Corrective Action
Check input voltage, rectifier circuit, DC bus capacitors
- 4
Test the System
After completing repairs, run the system and monitor for the error code. If it recurs, the issue may require professional diagnosis.
Safety Notice
Always disconnect power before performing any electrical work. If you're not a certified HVAC technician, contact a qualified professional for repairs involving refrigerant, electrical components, or compressor work.
Frequently Asked Questions
What does Rheem error code P1 mean?
Rheem error code P1 indicates: Over-voltage / under-voltage protection. This is typically caused by: DC bus voltage out of normal operating range.
How do I fix Rheem error code P1?
To fix Rheem error code P1: Check input voltage, rectifier circuit, DC bus capacitors. If the error persists after these steps, contact a qualified HVAC technician.
Is Rheem error code P1 serious?
Error code P1 (Over-voltage / under-voltage protection) should be addressed promptly to prevent further damage to your Rheem system. Always turn off the unit if you notice unusual sounds, smells, or continued malfunction.