Vaillant Error F.22: Low water pressure / dry fire
Safety switch-off due to low water pressure in the system (dry fire). The boiler detects insufficient water and shuts down to protect the heat exchanger. We diagnose and repair it across Greater Vancouver — same-day and after-hours.
Safety switch-off due to low water pressure in the system (dry fire). The boiler detects insufficient water and shuts down to protect the heat exchanger.
Vaillant fault codes can vary by model and series. Use this as a guide — the same code can have more than one cause. Our Technical Safety BC–licensed technicians read the code, confirm it against your unit's manual, and diagnose the true cause before any repair.
Likely causes of Vaillant error F.22
- System water pressure has dropped below ~1 bar (slow leak or recent bleeding of radiators)
- Faulty or disconnected water pressure sensor
- Air lock or low circulation in the system
- Pump fault or seized pump preventing flow
- Leak somewhere in the heating circuit
What you can safely check
- Check the pressure gauge on the boiler — it should read roughly 1.0–1.5 bar when the system is cold
- If low, top up using the filling loop per your user guide back to about 1.0–1.5 bar
Beyond these checks, do not open the unit or touch gas/electrical parts — BC law requires a licensed gas fitter. Call us for a proper diagnosis.
Error F.22 usually leaves you without heat or hot water and can indicate a safety-related fault. Don't keep resetting it — call for priority after-hours Vaillant repair.
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Parts often behind Vaillant error F.22
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Vaillant Error F.22 Repair Across Metro Vancouver
Frequently Asked Questions
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