Heat pumps · Error codes · Intergas
F254Intergas · Xtend hybrid heat pump
F254 on an Intergas Xtend hybrid heat pump: Bypass mode active (heat request forced to the boiler)
Short answer
On an Intergas heat pump, F254 means: Bypass mode active (heat request forced to the boiler). The heat pump keeps running with some functions stopped. An engineer is needed to fix the cause.
Reviewed 24 September 2026 · 1 source
What it means
The manual says: Bypass mode active (heat request forced to the boiler).
Part involved: see manual.
Likely causes:
- Not a fault as such; power off at fused spur, hold control button while restoring power to clear bypass mode.
Is it safe?
| Does the heat pump stop? | Partly |
|---|---|
| Engineer needed? | Yes |
The heat pump keeps running with some functions stopped.
Resetting itself: unknown.
What you can check
- Note the code shown on the controller and the model number on the unit's rating label before contacting your installer.
- Check that the heat pump's isolator and consumer-unit breaker are on; do not open any casing.
- Heating is still provided by the boiler; ask your installer to clear the bypass mode.
What the engineer will check
- Follow the manufacturer's troubleshooting for this code.
Who to ask for: Heat pump engineer.
Certification: Heat pump installer competence; F-gas and flammable-refrigerant (R32/R290) handling competence for any refrigerant-circuit work.
What you might notice
Sources
- Intergas Xtend Monoblock Heating Solutions Installation Instructions V1.2 (88302401w) ↗ · V1.2 · page p.72 · Reviewed 24 September 2026
A code explains what the controller detected, not a confirmed root cause.
Reviewed: 24 September 2026