S.287 on a Glow-worm GeniaAir: Outside of the operating range: Fan 1 rotational speed too high Fan 1 is turning too quickly. The cause is likely to be wind affecting the outdoor unit. It is not possible to start or operate the heat pump
Short answer
On a Glow-worm heat pump, S.287 means: Outside of the operating range: Fan 1 rotational speed too high Fan 1 is turning too quickly. The cause is likely to be wind affecting the outdoor unit. It is not possible to start or operate the heat pump. The heat pump keeps running with some functions stopped.
Reviewed 23 September 2026 · 1 source
What it means
The manual says: Outside of the operating range: Fan 1 rotational speed too high Fan 1 is turning too quickly. The cause is likely to be wind affecting the outdoor unit. It is not possible to start or operate the heat pump.
Part involved: Heat pump control (status/Live Monitor).
When it shows: Outside of the operating range: Fan 1 rotational speed too high Fan 1 is turning too quickly. The cause is likely to be wind affecting the outdoor unit. It is not possible to start or operate the heat pump.
Likely causes:
- Operating status reported by the heat pump control (not a fault in itself).
Is it safe?
| Does the heat pump stop? | Partly |
|---|---|
| Severity | Information only |
| Engineer needed? | No |
The heat pump keeps running with some functions stopped.
Resetting itself: yes - status changes automatically with operating state.
Manual reset: not applicable.
What you can check
- Status only: strong wind is turning the fan before start-up. Check the outdoor unit's air inlet and outlet are not blocked by leaves, debris, snow or ice build-up and clear any loose debris from around it (do not open the casing, poke the fins or use tools).
What the engineer will check
- None required unless heating/hot water is not delivered; then review status history, settings and application limits.
Who to ask for: Vaillant-trained heat pump installer/engineer (MCS-certified installer).
Certification: MCS installer certification; Vaillant product training recommended.
What you might notice
Sources
- GeniaAir Appliance Interface installation and maintenance instructions ↗ · 8000043014_01 · page HPIM 7 8000043014_01 p.28 · Reviewed 23 September 2026
A code explains what the controller detected, not a confirmed root cause.
Reviewed: 23 September 2026