Heat pumps · Error codes · Intergas
F001Intergas · Xtend hybrid heat pump
F001 on an Intergas Xtend hybrid heat pump: No flow in the CH circuit for at least 30 minutes
Short answer
On an Intergas heat pump, F001 means: No flow in the CH circuit for at least 30 minutes. 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: No flow in the CH circuit for at least 30 minutes.
Part involved: flow switch / circulation pump.
Likely causes:
- Check the CH pump; check the system for leaks; check the system water pressure.
Is it safe?
| Does the heat pump stop? | Partly |
|---|---|
| Severity | Fault — clears by itself when the condition goes |
| 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.
- Check the heating system pressure gauge reads within the range your installer set (typically 1-2 bar) and that the filling loop is closed.
What the engineer will check
- Check the circulation pump runs and the strainer/filter is clean.
- Vent air from the system.
- Check the flow switch/flowmeter and its wiring.
- Check isolation valves are open and minimum flow/volume is met.
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