What does the Viessmann F4 fault code mean?

Your boiler is failing to light because it cannot detect a flame, which means your heating and hot water have stopped working.

How much does it cost to fix Viessmann error code F4?

Typical repair cost for the Viessmann F4 fault is £150-300 including labour.

Viessmann F4 Fault Code: What It Means & How to Fix It

What the manual says

Manufacturer manual

Ignition module, gas train, or ionisation current failure; check the ignition module connection, gas train (230 V control voltage), gas supply pressure, ionisation current, electrode adjustment, condensate drain, and gas line for airlocks

From this model's manual

Verified against the Viessmann/Viessmann Vitodens 050 W Bpjd installation & service manual, page 53.

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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Boiler cover options

Avoid the next call-out bill

A cover plan would handle faults like F4: no call-out fees, no surprise bills.

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All 25 fault codes on the Vitodens 050-W BPJD

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

5A 10 18 30 38 51 52 59 A9 b0 B1 B8 CE E3 E5 F0 F1 F2 F3 F8 F9 FA FC Fd

Your boiler is failing to light because it cannot detect a flame, which means your heating and hot water have stopped working.

What the manual says

Engineer required

Avoid the next call-out bill

All 25 fault codes on the Vitodens 050-W BPJD

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