High
neon flashing (Fan runs) on Baxi Combi 80e

Your boiler has detected that the fan is spinning but not reaching the required speed to safely clear waste gases, preventing the burner from lighting.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed

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

Fan fails to run at maximum speed; refer to Section D.

From this model's manual
Verified against the Combi Instant 80e Current 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.

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 neon flashing (Fan runs): 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.

Related fault codes

Flame failure neonView →

All 12 fault codes on the Combi 80e

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

Burner on neon NOT illuminatedFlame Failure (Red Light) ONneon flashing (Burner lights)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)Red 'Flame Failure' neon litReset neon illuminated (Red)

Related guides you might find useful

Boiler keeps losing pressure

Six most common causes of dropping pressure.

Read →

Banging / kettling / whistling noise

Each noise points to a different fault.

Read →

When to replace your boiler

7 signs repair isn't worth it anymore.

Read →