Vaillant · ecoFIT pure
F.22 boiler fault code
ecoFIT pure combi
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What F.22 means
F.22 indicates low water pressure in the heating installation and the boiler has stopped to protect itself.
Safe check
Read the pressure display without opening the casing. If it is below the range shown in the user manual, use only the manufacturer-described filling procedure.
When to contact an engineer
The pressure will not hold, falls again, rises unexpectedly, or the code returns after the documented reset procedure.
Safety notice
A boiler fault code alone is not a gas or carbon-monoxide emergency. If you smell gas, a CO alarm sounds, anyone feels unwell, or there is an unsafe flame, leave and call 0800 111 999 from outside.
Source and provenance
- Operating instructions ecoFIT pure 0020230532_03
operating instructions
01.08.2019