HVACopediaBosch · Heat pump · Defrost
Manual (forced) defrost test
What happens, in order
- Make sure there is a call for heat and the system has run at least 8 minutes
- Hold the Force button on the control board for 6 seconds
- Wait about 40 seconds for defrost to begin
- Display shows dF once defrost starts
- Test ends by itself and the display returns to the running speed
- For another test, wait 5 minutes and repeat
Timings and thresholds
| Item | Value |
|---|---|
| Minimum heat run before test | 8 min |
| Button hold | 6 s |
| Start delay | About 40 s |
| Wait between tests | 5 min |
Codes you may see during this
Applies to: Bosch IDS inverter heat pump condensing units
Models
More Bosch heat pump sequences
- Crankcase heater and reversing valve behaviour · Startup
- Demand defrost · Defrost
- Oil return and force (charge) mode · Other
- Operating limits and compressor protections · Other
Related
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Source: Bosch IDS Light (BOVA15, R-454B) installation BTC 762003308 D, 17 System operation; Bosch IDS Premium Connected (BOVA36-60-20) installation BTC 762003301 D, 18 System operation; Bosch IDS 2.0 (BOVA-36-60HDN1) service manual Rev3 07.2021, 10.2 Other operations. Written in our own words; timings can differ by model and software version, so check the manual for your exact unit.
For licensed technicians. Gas, electrical and refrigerant work must be done by a qualified, licensed person. Shut off power and gas before servicing, never bypass a safety control, and follow the manufacturer’s manual for the exact model; it and local codes always take priority. HVACopedia is not affiliated with any manufacturer; brand and model names only identify the equipment.