Low
4 green flashes on Baxi Statesman

Your boiler is having a temporary 'conversation' issue between its internal electronics which should resolve itself automatically.

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

Communication error between printed circuit board (PCB) and control. Temporary error, will self reset.

From this model's manual
This code was read directly from the manufacturer service manual for this model.
Plain-English guidance below. Severity, DIY steps, costs and parts are our interpretation to help you act, not text from the manual.

DIY fix possible

Wait for the boiler to self-reset as this is often a temporary glitchSwitch the boiler off at the fused spur switch for 30 seconds and turn it back onEnsure no external controls or thermostats are being adjusted rapidly

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Avoid the next call-out bill

A cover plan would handle faults like 4 green flashes: no call-out fees, no surprise bills.

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