Bosch Error Code dF: Defrost in progress (Heat Pump)
Bosch error code dF on a heat pump means: Defrost in progress. It is also called Bosch diagnostic code dF.
Homeowner? What Bosch code dF means for you
Usually minor Your heat pump is reporting: Defrost in progress. This code is usually informational or minor. The safe checks below often clear it; call us if it keeps showing up.
Safe things you can check yourself
- Check the thermostat: right mode (Heat or Cool), set a few degrees past room temperature, and fresh batteries if it uses them.
- Check both breakers and the outdoor disconnect box beside the outdoor unit; all should be ON.
- Look at the air filter. If it is grey and clogged, replace it; a blocked filter causes many shutdowns.
- In winter, keep snow and ice off and away from the outdoor unit. A short defrost cycle with steam is normal.
- Try one reset: turn the power off for 30 seconds, then back on. If the code comes back, stop resetting and call a technician.
Call (647) 657-2977Book a service call
Licensed technicians serving Vaughan, Toronto and the GTA.
What does Bosch error code dF mean?
While the outdoor unit is defrosting, the board display shows dF with no digits after it. The unit leaves defrost on its own when the coil (T3) reaches 64 F for 1 minute or after 8 minutes. After a forced defrost test the display goes back to showing the running speed.
Applies to: BOVA IDS 2.0, IDS Premium Connected and IDS Light heat pumps
Bosch models that use code dF
BOVA-36HDN1-M20GBOVA-60HDN1-M20GBOVA15-24BOVA15-36BOVA15-60BOVA36-20BOVA60-20
Other Bosch Heat Pump codes
All Bosch Heat Pump error codes →
Bosch code dF: homeowner questions
What does Bosch code dF mean?
Defrost in progress. While the outdoor unit is defrosting, the board display shows dF with no digits after it. The unit leaves defrost on its own when the coil (T3) reaches 64 F for 1 minute or after 8 minutes. After a forced defrost test the display goes…
Is it safe to keep using my heat pump with code dF?
Usually yes. Code dF is normally minor, but if it keeps coming back have it checked.
Can I reset Bosch code dF myself?
You can try one reset (power off for 30 seconds, then on). If Bosch code dF comes back, the cause is still there and a licensed technician should check it.
Who can fix Bosch code dF near me?
Aurora Star Tech Inc. repairs Bosch heat pumps in Vaughan, Toronto and across the GTA. Call (647) 657-2977 or book a service call online.
Homeowner help: AC Running But Not Cooling: What to Check · Heat Pump Not Heating or Blowing Cold Air
Troubleshooting guides
- Force cooling for charging with the FORCE button Bosch · Heat Pump
- Pair the gateway by Bluetooth (Connect button) Bosch · Heat Pump
- Read system values with the CHECK button (point check) Bosch · Heat Pump
- Restart the gateway (Reset button) Bosch · Heat Pump
- Run the gateway diagnostic (Factory + Connect buttons) Bosch · Heat Pump
- Start a manual defrost test (hold FORCE 6 s) Bosch · Heat Pump
Source: Bosch IDS Premium Connected BTC 762003301 D (02.2025), 18.4 Defrost Description and 18.9 p.49; IDS Light BTC 762003308 D, 17.9 p.43; IDS 2.0 service Rev3 (07.2021), 10.2.1 Defrost Operation p.31. Written in our own words as a summary; always check the original manual.
General guidance for qualified technicians. The manufacturer's installation and service manual and local codes always take priority. Aurora Star Tech is not affiliated with, endorsed by or sponsored by any equipment manufacturer; brand and model names are used only to identify equipment and belong to their owners.