What does the Viessmann 738 fault code mean?

Your boiler has spotted a room controller that is connected but has not been set up properly, so it may not be controlling your heating as intended.

How much does it cost to fix Viessmann error code 738?

Typical repair cost for the Viessmann 738 fault is £60-120 including labour.

Manufacturer manual

OpenTherm remote control connected but not configured

From this model's manual

Verified against the Viessmann/Viessmann Vitodens 100 W B1hf B1kf 6167586 installation & service manual.

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

Boiler cover options

A cover plan would handle faults like 738: no call-out fees, no surprise bills.

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

Change the batteries first, even if the screen still works.

Work through these before the call-out.

Break-even maths on monthly cover.