Medium
S.36 on Vaillant Turbomax Plus 828

Your boiler is waiting for a signal from your thermostat or programmer, but it isn't receiving one, so it is staying in standby mode.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed

Book a service

This fault should be looked at by a Gas Safe engineer within the next week or two. It may get worse if left.

What the manual says

Manufacturer manual

No heating demand from low voltage controls

From this model's manual
Verified against the Vaillant Turbomax Plus 824 828e installation & service manual, page 38.
Plain-English guidance below. Severity, DIY steps, costs and parts are our interpretation to help you act, not text from the manual.

DIY fix possible

Check that your room thermostat is turned up higher than the current room temperature.Replace the batteries in your wireless room thermostat or programmer.Ensure your external timer or heating controls are set to an 'ON' period.

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