E103 on a Trianco heat pump: Fan 1 Thermal Overload Prot
Short answer
On a Trianco heat pump, E103 means: Fan 1 Thermal Overload Prot. 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 · 2 sources
What it means
On the Activair Commercial R290 50kW (FG9550)
The manual says: Fan 1 Thermal Overload Prot.
Part involved: DC fan motor / fan driver board.
Likely causes:
- Fan 1 thermal overload.
On the Activair High Temperature R290 (5/9/15/22kW)
The manual says: Fan motor overload protection.
Part involved: DC fan motor / fan driver board.
Likely causes:
- Fan motor overload.
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 outdoor unit grille/coil is not blocked by leaves, debris or snow (do not open the casing).
What the engineer will check
On the Activair Commercial R290 50kW (FG9550)
- Check if fan 1 is running normally.
Who to ask for: heat pump electrical.
Certification: Electrical competence for work inside the outdoor unit.
On the Activair High Temperature R290 (5/9/15/22kW)
- Check if the fan motor is running.
- Detect the current of fan motor.
- If >1A the motor needs replacing.
- If <1A the motor control module needs replacing.
Who to ask for: heat pump electrical.
Certification: Electrical competence for work inside the outdoor unit.
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
A code explains what the controller detected, not a confirmed root cause.
Reviewed: 23 September 2026