Heat pumps · Error codes · Cool Energy
VF22Cool Energy · ProInverter (R290, 75C)
VF22 on a Cool Energy ProInverter: Driver board fault: Abnormal communication
Short answer
On a Cool Energy heat pump, VF22 means: Driver board fault: Abnormal communication. The heat pump stops until the fault clears or is reset. An engineer is needed to fix the cause.
Reviewed 23 September 2026 · 1 source
What it means
The manual says: Driver board fault: Abnormal communication.
When it shows: Detected after power on; alarm action 'Stop the compressor'.
Likely causes:
- Check the wiring between the control board and driver board.
Is it safe?
| Does the heat pump stop? | Yes |
|---|---|
| Engineer needed? | Yes |
The heat pump stops until the fault clears or is reset.
What you can check
- Read and note the code shown on the controller display, then contact your installer or service engineer.
- Check the heat pump's breaker/isolator at the consumer unit is switched on (do not repeatedly reset if it trips).
What the engineer will check
- Check the wiring between the control board and driver board.
- Check communication cable between controller/PCB/driver board (type, polarity, termination).
- Check power supply to the remote module.
- Replace faulty PCB/controller if wiring is sound.
Who to ask for: heat pump controls / electrical.
Certification: Electrical competence.
What you might notice
Sources
- Cool Energy ProInverter Monoblock Series R290 Heat Pump Water Heaters - Installation and Users Guide v7.0 (2025) ↗ · Version 7.0 · page 45-46 · Reviewed 23 September 2026
A code explains what the controller detected, not a confirmed root cause.
Reviewed: 23 September 2026