BoilerFaultCodesVaillant P.06 Fault Code
Also written as P06 — same fault.
The Vaillant P.06 fault code means: your boiler has been manually set to a maintenance mode for filling or draining the system, meaning it is currently paused and will not provide heating or hot water.. It appears on 28 Vaillant models in our database.
Technical description: Filling mode: The prioritising diverter valve is moved to the mid-position. The burner and pump are switched off (to fill or drain the product).
What causes the Vaillant P.06 fault?
This code appears because the boiler has been manually put into a specific service mode by a person interacting with the control panel. It is triggered when someone is intending to fill, drain, or bleed the system, which causes the boiler to pause its normal operation for safety. The boiler hasn't broken; it is simply waiting in a 'standby' state while maintenance tasks are performed.
DIY fix possible
Navigate to the boiler's digital menuExit the 'Check Program' or 'Filling' settingsRestart the boiler to return it to normal operation
Find a Gas Safe engineer
Search the official register for a qualified engineer in your area.
Gas Safe Register →Vaillant models that show the P.06 fault code
Click a model for the full fault code list and model-specific repair notes.
- Atmomax
- Combi Compact 242EB
- Combi Compact 282EB
- ecoFIT pure
- ecoFIT Pure 418
- ecoFIT Pure 425
- ecoFIT Pure 435
- ecoFIT Pure 825
- ecoFIT Pure 830
- ecoFIT Pure 835
- ecoTEC plus
- ecoTEC Plus 615
- ecoTEC Plus 620
- ecoTEC Plus 625
- ecoTEC Plus 630
- ecoTEC Plus 635
- ecoTEC Plus 65
- ecoTEC Plus 832
- ecoTEC Plus 836
- ecoTEC Plus 840
- ecoTEC Plus 938
- ecoTEC plus System
- ecoTEC Pro
- ecoTEC Pro 24
- ecoTEC Pro 28
- ecoTEC Pro 30
- ecoTEC sustain
- Home System
Source
Vaillant P.06 fault code information on this page is sourced and cross-checked against the official Vaillant service / installation manuals for each affected model.
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026