BoilerFaultCodesMain Eco Fault codes & diagnostics
0 fault codes with plain-English explanations, severity ratings, DIY guidance, and repair cost estimates.
Combi Natural Gas 25-30 kW 2005-2012 Discontinued
Replaced by: Main Eco Compact
The Eco range comes in 2 types
Pick the one you have. The fault codes, GC numbers and manual differ by type.
Each model has its own manual
The fault code is already on your display
Note it down before pressing reset — resetting clears the code immediately. How to read fault codes →
Status & diagnostic codes 10 operating states & engineer diagnostics
Not faults — these are normal operating states. Tap to expand.
10 operating states & engineer diagnostics
Not faults — these are normal operating states. Tap to expand.
24 Status Your boiler has stopped working because it cannot light its flame, which is sometimes caused by a blockage in the pipe that drains away waste water. 25 Status Your boiler has detected that it is getting dangerously hot and has automatically shut itself down to prevent damage or fire risk. 26 Status Your boiler is struggling to clear exhaust gases outside, so it has safely shut itself down to prevent any risk of fumes entering your home. 27 Status Your boiler is struggling to circulate water, either because there isn't enough water inside the system or because the internal pump has failed. 28 Status Your boiler is struggling to detect the temperature of the water coming out of your taps, which means it cannot heat your hot water properly. 29 Status Your boiler has stopped working because it is unable to accurately measure the temperature of the water used for your radiators. 30 Status Your boiler is simply performing its normal startup routine after being switched on or restarting after a power cut. 31 Status Your boiler is currently running in hot water mode, which is a standard operating state rather than a breakdown. 32 Status Your boiler is currently stuck in a cycle while trying to heat your radiators, which means your heating and hot water may not work until the issue is cleared. 33 Status Your boiler is operating normally and the burner is currently lit, meaning it is successfully heating your water or radiators.