BoilerFaultCodesYour boiler is simply indicating that power has been restored and it is starting up as normal.
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.
Technical description: Displayed when the main electricity supply is switched ON.
What causes this fault?
This code appears when the boiler receives a fresh flow of electricity after being switched off at the wall or following a power cut. It is an automated notification that the internal control board is performing its initial checks before resuming normal operation. You will see this briefly every time the system is powered up, and it does not indicate a malfunction.
DIY fix possible
Check that the display changes to a temperature or operating mode after a few moments.Ensure your thermostat is calling for heat if the boiler does not start heating.No action is required if the boiler continues to operate normally.
Find a Gas Safe engineer
Search the official register for a qualified engineer in your area.
Gas Safe Register →Protect yourself from future repair bills
A boiler cover plan would cover faults like 0 — no call-out fees, no surprises.
Affiliate links — we may earn a commission at no extra cost to you.
Potterton Envoy System is discontinued — time for a new one?
Parts for discontinued models can be hard to find and expensive. A new A-rated boiler could save you money on both repairs and energy bills.
Affiliate links — we may earn a commission at no extra cost to you.