High
neon flashing (3rd instance) on Potterton Performa 28i

Your boiler is struggling to confirm it is venting exhaust gases safely, causing the internal fan to run continuously at high speed to try and clear the system.

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 runs at max speed. Air pressure switch proved. Go to section ‘D’.

From this model's manual
Verified against the Potterton/Potterton Performa 28i 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 (3rd instance): 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 34 fault codes on the Performa 28i

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

10232425262728293030 neon flashing30° neon flashing313240 neon flashing40° neon flashing50 neon flashing50° neon flashing60 neon flashing60° neon flashing70 neon flashing80 neon flashingAll neons flashingFault on Fan or FlueFault on Hot Water SensorFlame Failureneon flashingneon flashing (1st instance)neon flashing (2nd instance)neon flashing (4th instance)neon flashing (5th instance)Neon illuminated (Burner)neons flashingPreheat neon flashing

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 →

Yellow or orange flame — CO safety

Safety-critical — turn off, read this.

Read →