High
F.074 on Vaillant ecoTEC Plus 836

Your boiler is struggling to read how much water is inside the system because the sensor that monitors pressure has lost its electrical connection.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed

Call an engineer soon

Book a Gas Safe engineer within 24 to 48 hours. Your boiler may be unsafe or could break down completely if left.

What the manual says

Manufacturer manual

Fault in the electrical connection for the water pressure sensor. The signal for the water pressure sensor has been interrupted.

From this model's manual
Verified against the Vaillant Ecotec Plus installation & service manual, page 86.
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 is a high severity fault. Stop using the boiler and call a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.

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