BoilerFaultCodesYour boiler has reached its set heat limit and has temporarily shut itself down to prevent overheating.
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: Boiler is off after reaching temperature.
What causes this fault?
This occurs when the boiler has successfully heated the water to your desired temperature, causing the burner to turn off temporarily to prevent the system from getting too hot. It is often a sign of normal operation, though it can sometimes happen if the water isn't moving away from the boiler quickly enough due to a pump issue or a blockage. Effectively, the boiler is just taking a break because it has reached its target heat limit.
DIY fix possible
Check that all radiator valves are fully open to allow water to circulateEnsure the system pressure is between 1.0 and 1.5 bar on the gaugeWait for the boiler to cool down naturally, at which point it should restart automatically
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 6 — no call-out fees, no surprises.
Affiliate links — we may earn a commission at no extra cost to you.
Glow-worm Energysaver Combi 2 80 100 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.