Bosch Error Code F3
Discharge temperature sensor T5 fault
Error Code Summary
| Brand | Bosch |
| Error Code | F3 |
| Meaning | Discharge temperature sensor T5 fault |
| Cause | Compressor discharge thermistor open or short circuit |
| Recommended Action | Check sensor on discharge line, replace if resistance out of range |
How to Fix Bosch Error F3
- 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 F3 means: Discharge temperature sensor T5 fault. The most common cause is: Compressor discharge thermistor open or short circuit.
- 3
Take Corrective Action
Check sensor on discharge line, replace if resistance out of range
- 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 F3 mean?
Bosch error code F3 indicates: Discharge temperature sensor T5 fault. This is typically caused by: Compressor discharge thermistor open or short circuit.
How do I fix Bosch error code F3?
To fix Bosch error code F3: Check sensor on discharge line, replace if resistance out of range. If the error persists after these steps, contact a qualified HVAC technician.
Is Bosch error code F3 serious?
Error code F3 (Discharge temperature sensor T5 fault) 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.