High
359 on Viessmann Vitodens 100-W B1HF-11

Your boiler is trying to light but cannot get the flame started, so it has stopped and is not providing heating or hot water until a qualified engineer checks the ignition and gas supply.

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

Ignition: No. Check ignition module (control voltage 230 V across plug "X1/54" terminals "L" and "N" on the HBMU). Check the gas supply.

From this model's manual
Verified against the Viessmann/Viessmann Vitodens 100 W B1hf B1kf 6167586 installation & service manual.
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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All 151 fault codes on the Vitodens 100-W B1HF-11

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