Low
P.04 on Glow-worm Energy

Your boiler is currently performing a temporary automatic test to ensure it is heating your water and radiators at the correct power levels.

Monitor it

This is a minor fault. Keep an eye on it and mention it at your next annual boiler service. Reset the boiler and see if it clears.

What the manual says

Manufacturer manual

Maximum output function: If there is a hot water request, the product runs in hot water handling mode with maximum heat input. If there is no hot water request, the product runs in heating mode with the heating partial load that is set using diagnostics code d.00. The function is activated for 15 minutes.

Shared across the Energy 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.
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 fault requires 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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