Low
Burner On (Green) light on on Potterton Performa SL HE 9 2

Your boiler is operating normally and is successfully heating your water or home as requested.

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

Burner flame has established

From this model's manual
Verified against the Potterton/Potterton Performa Sl He 9 2 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 fault requires 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 Burner On (Green) light on: 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 16 fault codes on the Performa SL HE 9 2

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

Air Proving LOCKOUTAPS Stuck FaultBurner On (Green) light flashCasting Thermistor FaultElectrical Supply FaultFalse Flame FaultFlow Thermistor FaultIgnition LOCKOUTLockout (Red) flashingLockout (Red) light flashLockout (Red) light onMains On (Green) light flashOverheat LOCKOUTPCB FaultWater Circulation LOCKOUT

Related guides you might find useful

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 →

New boiler cost 2026

Realistic UK prices for a swap.

Read →