Heat pumps · Error codes · Warmflow
F151Warmflow · Zeno R290 air source heat pump AS01-R290/AS02-R290/AS03-R290
F151 on a Warmflow Zeno R290 air source heat pump AS01-R290/AS02-R290/AS03-R290: Comp. Driver and PCB Communication Fault
Short answer
On a Warmflow heat pump, F151 means: Comp. Driver and PCB Communication Fault. 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: Comp. Driver and PCB Communication Fault.
Part involved: controller/PCB communication.
Likely causes:
- There is a communication error between the DSP and the main 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
- Note the exact code shown on the controller (a photo helps) and report it to your installer or the manufacturer's service line.
- Check the heat pump's supply breaker/isolator at the consumer unit is on (do not open any casing).
- Check the controller display is lit and showing the code.
What the engineer will check
- Check the wiring and connection between the inverter and the main board.
Who to ask for: heat pump controls / electrical.
Certification: Electrical competence (Part P / qualified electrician) for work inside control panels.
What you might notice
What owners and engineers report
1 owner and engineer report mentions this.
- Controller / thermostat problem on the Zeno R290 air source heat pump AS01-R290/AS02-R290/AS03-R290: 1 report
Sources
- Warmflow High Efficiency Variable Speed Air Source Heat Pumps A-Series AS01-R290 / AS02-R290 / AS03-R290 - User, Installation & Service Instructions, Guarantee (9009049 Rev D) ↗ · 9009049 Rev D · page 59 · Reviewed 23 September 2026
A code explains what the controller detected, not a confirmed root cause.
Reviewed: 23 September 2026