Vaillant · ecoTEC exclusive
Communication fault boiler fault code
ecoTEC exclusive combi
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What Communication fault means
The manual lists a communication fault between the display and the PCB in the electronics box. The manual warns that some shared-table codes may not be visible on every product variant.
Safe check
Read and note the displayed message. Do not open or adjust the boiler. Contact a Gas Safe registered engineer for diagnosis.
When to contact an engineer
Arrange a Gas Safe registered engineer to diagnose the communication fault; it involves internal electrical components.
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 exclusive combi Installation and Maintenance Instructions · 0020193968_05 · Appendix E, Communication fault, printed p. 58
installation and maintenance instructions
0020193968_05