Low
P.5 on Vaillant ecoTEC 65kW

Your boiler is currently running a mandatory internal safety test to ensure its emergency shutdown systems are working correctly.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed

Monitor it

This is a minor fault. Keep an eye on it and mention it at your next annual boiler service. Reset the boiler and see if it clears.

What the manual says

Manufacturer manual

SCO (safety cut-out) check programme: The burner is switched on and the control is switched off so that the product heats up until it reaches the safety cut-out's switch-off temperature of 97°C while avoiding a regular shutdown.

From this model's manual
Verified against the Vaillant Ecotec 65kw installation & service manual, page 17.
Plain-English guidance below. Severity, DIY steps, costs and parts are our interpretation to help you act, not text from the manual.

Engineer required

This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.

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