Potterton Housewarmer Fault Codes

Regular Natural Gas 8.8 kW 1994-2003 Discontinued

GC Numbers: 41-591-1041-591-1341-591-1441-591-1541-591-16

The fault code is already on your display

Note it down before pressing reset — resetting clears the code immediately. How to read fault codes →

Most common fault codes

Code	Severity	Plain English	DIY
LED SHOWING RED LIGHT AFTER APPX 20 SEC	High	Your boiler has failed to light properly and has safety-locked itself to prevent gas buildup.	Yes
Lockout (Red LED)	High	Your boiler has stopped trying to light itself because the small starter flame failed to ignite within the safety time limit.	Yes
LOCKOUT: a	High	Your boiler's small starter flame has become blocked by dust or debris, preventing the main heating system from firing up.	Engineer
LOCKOUT: b	High	Your boiler has switched itself off because it has gotten too hot, likely due to a blockage or a pump issue stopping the water from circulating.	Yes
LOCKOUT: c	Emergency	Your heater has shut down because it cannot pull in enough fresh air to operate safely, which increases the risk of dangerous carbon monoxide buildup.	Yes
LOCKOUT: d	Emergency	Your boiler has shut down because the exhaust fumes are not being cleared away safely through the chimney or flue.	Engineer
Red LED (Overheat)	High	Your boiler has switched itself off because it has gotten too hot, likely due to a circulation problem or a temporary blockage.	Yes

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