Bosch Error Code P1
Over-voltage or under-voltage protection
Error Code Summary
| Brand | Bosch |
| Error Code | P1 |
| Meaning | Over-voltage or under-voltage protection |
| Cause | Input voltage or DC bus voltage out of range |
| Recommended Action | Check incoming voltage with multimeter, inspect rectifier and capacitors |
How to Fix Bosch 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 or under-voltage protection. The most common cause is: Input voltage or DC bus voltage out of range.
- 3
Take Corrective Action
Check incoming voltage with multimeter, inspect rectifier and 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 Bosch error code P1 mean?
Bosch error code P1 indicates: Over-voltage or under-voltage protection. This is typically caused by: Input voltage or DC bus voltage out of range.
How do I fix Bosch error code P1?
To fix Bosch error code P1: Check incoming voltage with multimeter, inspect rectifier and capacitors. If the error persists after these steps, contact a qualified HVAC technician.
Is Bosch error code P1 serious?
Error code P1 (Over-voltage or under-voltage protection) should be addressed promptly to prevent further damage to your Bosch system. Always turn off the unit if you notice unusual sounds, smells, or continued malfunction.