Vaillant · ecoTEC pro
F.22 boiler fault code
ecoTEC pro 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. The manual notes that some shared-table codes may not be visible on every product variant.
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
- ecoTEC pro 24/28 combi Installation and Maintenance Instructions · 0020244995_05 · Appendix D, F.22, printed p. 47
installation and maintenance instructions
0020244995_05
- Operating instructions ecoTEC pro 0020244996_01
operating instructions
03.08.2017