What does the Heatline d.35 fault code mean?

Your boiler is struggling to switch between heating your radiators and heating your hot water, which usually means a small internal valve is stuck.

How much does it cost to fix Heatline error code d.35?

Typical repair cost for the Heatline d.35 fault is £180-300 including labour.

Manufacturer manual

3 way valve position

Shared across the Capriz Plus range

This code is shared by the boilers in this range, which use the same control board. It may not be printed in this exact variant’s manual.

This is a high severity fault. Stop using the boiler and call a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.

Boiler cover options

A cover plan would handle faults like d.35: no call-out fees, no surprise bills.

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Seeing a different code? Every code this model can display, in one place.

Almost always a stuck diverter valve on a combi.

One cold radiator is usually a stuck valve pin or trapped air.

On a combi it is usually the diverter valve. On a system boiler, the motorised valve.