Low
閃 neon flashing on Baxi Combi 80 Maxflue

Your boiler is currently preheating the internal water to ensure you get hot water quickly when you turn on a tap.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed

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

Preheating function starts (DHW preheating circuit)

From this model's manual
Verified against the Baxi/Baxi Combi 80e 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.

DIY fix possible

No action is required as this is a normal operating function.Wait for the neon light to stop flashing once preheating is complete.If the light never stops flashing or the boiler fails to fire, try a simple reset.

Find a Gas Safe engineer
Search the official register →
Boiler cover options

Avoid the next call-out bill

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

Approved partner
Domestic Appliance Guard
Unlimited call-outs, 24/7 helpline, no price-hike promise
Get a quote →

Affiliate links. We may earn a commission at no extra cost to you.

All 47 fault codes on the Combi 80 Maxflue

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

© neon flashing10111213141522232425262728293031Burner On NeonBurner on neon NOT illuminatedDHW FLOW SWITCHFANFlame Failure (Red Light) ONFlame Failure Neonneon flashingneon flashing (Burner lights)neon flashing (Fan runs)neon flashing (Pump runs)neon flashing (Section D)neon flashing (Section E)neon flashing (Section H & K)neon flashing (Section I)neon flashing (Section J)neon flashing (Spark/Ignition)neon illuminatedPower On NeonPressure of 3 or greaterRed 'Flame Failure' neon litReset neon illuminated (Red)Safety thermostat activated且 neon flashing布 & 皿 neons flashing布 neon flashing毛 neon flashing皿 neon illuminated血 neon illuminated閃 neon illuminated

Related guides you might find useful

No hot water but heating works

Almost always a stuck diverter valve on combis.

Read →

Is boiler cover worth it?

Break-even maths on monthly cover.

Read →

When to replace your boiler

7 signs repair isn't worth it anymore.

Read →