Vaillant · ecoFIT pure
F.23 boiler fault code
ecoFIT pure combi
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Renting? Report it to your landlord or housing provider first. They are responsible for gas safety and boiler repairs, and the repair should not cost you.
What F.23 means
Safety shutdown: Temperature spread too great (NTC1/NTC2)
Safe check
Note the code shown on the display. Do not open, adjust or repeatedly reset the boiler. Contact a Gas Safe registered engineer.
When to contact an engineer
Note the code shown on the display. Do not open, adjust or repeatedly reset the boiler. Contact a Gas Safe registered engineer.
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
- ecoFIT pure combi Installation and Maintenance Instructions · Appendix D “Overview of fault codes”, p. 44
installation and maintenance instructions
Installation and maintenance instructions 0020230531_07 · 20.10.2020