Emergency
Pilot will not light (1) on Chaffoteaux Flexiflame 140

Your boiler is failing to ignite because it is not receiving a flow of gas.

Act immediately

Turn off your boiler and stop using gas appliances. Call a Gas Safe engineer now. This fault can be dangerous if ignored.

What the manual says

Manufacturer manual

Gas supply not turned on.

From this model's manual
Verified against the Chaffoteaux Flexiflame 140 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 emergency severity fault. Stop using the boiler and call a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.

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Avoid the next call-out bill

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