Vaillant · ecoTEC pro
F.01 boiler fault code
ecoTEC pro combi
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What F.01 means
F.01 indicates return temperature sensor interruption. The manual warns that some shared-table codes may not be visible on every product variant.
Safe check
Read and note the displayed code. Do not open, adjust or reset the boiler. Contact a Gas Safe registered engineer for diagnosis.
When to contact an engineer
The displayed fault remains or returns; arrange diagnosis by 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
- ecoTEC pro 24/28 combi Installation and Maintenance Instructions · 0020244995_05 · Appendix D, F.01, printed p. 47
installation and maintenance instructions
0020244995_05