E081 on a Trianco heat pump: DC Fan Board 1 Communication Fault
Short answer
On a Trianco heat pump, E081 means: DC Fan Board 1 Communication Fault. The manual does not say whether the heat pump stops. An engineer is needed to fix the cause. The wording differs by model range — each is shown below.
Reviewed 23 September 2026 · 4 sources
What it means
On the Activair Commercial R290 50kW (FG9550)
The manual says: DC Fan Board 1 Communication Fault.
Part involved: controller/PCB communication.
Likely causes:
- Communication of the speed regulation module 1 with main board is abnormal.
On the Activair High Temperature R290 (5/9/15/22kW)
The manual says: Communication failure between PCB and fan drive board.
Part involved: controller/PCB communication.
Likely causes:
- Communication error between PCB and fan drive board.
On the Activair R290 Indoor (3.2kW wall hung / 5kW floor standing)
The manual says: Fan Motor 1 and PCB Communication Fault.
Part involved: controller/PCB communication.
Likely causes:
- Speed control module and main board communication fail.
On the Activair Pro (AI) R290 6/12/17kW
The manual says: Fan Motor 1 and PCB Communication Fault.
Part involved: controller/PCB communication.
Likely causes:
- Speed control module and main board communication fail.
Is it safe?
| Does the heat pump stop? | Not stated |
|---|---|
| Engineer needed? | Yes |
The manual does not say whether the heat pump stops.
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
On the Activair Commercial R290 50kW (FG9550)
- Check the speed regulation module 1 and the main board and if their connections are normal and reliable.
Who to ask for: heat pump controls / electrical.
Certification: Electrical competence (Part P / qualified electrician) for work inside control panels.
On the Activair High Temperature R290 (5/9/15/22kW)
- Check the connection between PCB and fan board (12V-12V, GND-GND, A-A, B-B).
- If connected, power on and measure 12V-GND on fan board.
- if >15V or <7V replace the fan board.
Who to ask for: heat pump controls / electrical.
Certification: Electrical competence (Part P / qualified electrician) for work inside control panels.
On the Activair R290 Indoor (3.2kW wall hung / 5kW floor standing)
- Check the communication connection.
Who to ask for: heat pump controls / electrical.
Certification: Electrical competence (Part P / qualified electrician) for work inside control panels.
On the Activair Pro (AI) R290 6/12/17kW
- Check the communication connection.
Who to ask for: heat pump controls / electrical.
Certification: Electrical competence (Part P / qualified electrician) for work inside control panels.
What you might notice
Sources
- Trianco Activair Commercial High Temperature Air Source Heat Pump (R290 50kW FG9550) - Installation Operation and Service Manual ↗ · 2024-10 · page 39 · Reviewed 23 September 2026
- Trianco Activair High Temperature Air Source Heat Pump (R290 5/9/15/22kW) - Installation Operation and Service Manual ↗ · November 2024 (PDF regenerated 2026-08) · page 35 · Reviewed 23 September 2026
- Trianco Activair R290 High Temperature Indoor Air Source Heat Pump (3.2kW wall hung) - Installation Operation and Service Manual ↗ · 2026-08 · page 33 · Reviewed 23 September 2026
- Trianco Activair Pro Air Source Heat Pump (R290 6/12/17kW) - Installation Operation and Service Manual ↗ · 06/2026 · page 40 · Reviewed 23 September 2026
A code explains what the controller detected, not a confirmed root cause.
Reviewed: 23 September 2026