High
Flame loss on Potterton Envoy Plus

Your boiler is attempting to light but is failing to stay on, meaning it cannot provide you with any heating or hot water.

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

Flame loss after initial detection

From this model's manual
Verified against the Potterton/Potterton Envoy installation & service manual, page 25.
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 Flame loss: 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 24 fault codes on the Envoy Plus

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

Case sensorCase temperatureControl failedDisplay not illuminatedDry fireDry fire sensorFan speedFlashingFlow sensorHot Surface IgniterLockoutPulse Red (1 flash)Pulse Red (2 flashes)Pulse Red (3 flashes)Pulse Red (4 flashes)Pulse Red (5 flashes)Pulse Red (6 flashes)Return sensorSensorShorted signalShut downStand-byWiring fault

Related guides you might find useful

No hot water but heating works

Almost always a stuck diverter valve on combis.

Read →

Boiler keeps cutting out

Lockout fault with a reset-needed pattern.

Read →

Pilot light keeps going out

Older boilers — thermocouple, draught, gas supply.

Read →