BoilerFaultCodes.com

Ideal Icos HE Fault Codes

Regular Natural Gas 12-24 kW 2005-2012 Discontinued
GC Numbers: 41-409-5441-409-5541-409-5641-409-57

Replaced by: Logic Heat

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

5
Your boiler has detected an issue with the sensor that measures the temperature of the water used for your heating, meaning it cannot operate safely or accurately.
Gas Safe engineer required · £90-160
7
Your boiler has shut down because the internal exhaust gases have reached a temperature that is dangerously high, posing a risk of damage to the unit.
Gas Safe engineer required · £150-450
8
Your boiler has shut down because waste water is unable to drain away, likely due to a frozen or blocked external pipe.
May be DIY safe · £0-120

All 14 fault codes

Code Severity Plain English
5 High Your boiler has detected an issue with the sensor that measures the temperature of the water used for your heating, meaning it cannot operate safely or accurately.
6 Medium Your boiler's hot water sensor has stopped working correctly, which means the system cannot safely tell how hot your water is.
7 High Your boiler has shut down because the internal exhaust gases have reached a temperature that is dangerously high, posing a risk of damage to the unit.
8 High Your boiler has shut down because waste water is unable to drain away, likely due to a frozen or blocked external pipe.
ERROR CODE 1 High Your boiler has failed to ignite or lost its flame and has shut down as a safety precaution.
ERROR CODE 2 High Your boiler has become too hot and has shut itself down as a safety precaution to prevent damage.
ERROR CODE 3 High Your boiler has detected an issue with the air pressure or water flow sensors, preventing it from firing up for safety.
ERROR CODE 4 High Your boiler is having trouble venting exhaust gases safely, which prevents it from firing up to provide heating or hot water.
ERROR CODE 5 High Your boiler has detected a problem with the internal sensor that monitors the temperature of the water for your radiators.
ERROR CODE 6 High Your boiler is having trouble measuring the temperature of your hot water, likely meaning you won't have any hot water available.
ERROR CODE 7 High Your boiler has shut down because it has detected that the exhaust gases are becoming dangerously hot, which usually suggests a serious internal blockage or a lack of water circulation.
ERROR CODE 8 High Your boiler has stopped working because the waste water pipe is likely blocked or frozen, causing water to back up into the unit.
Fault indication light (2) High Your boiler has detected an internal error or has become too hot and has safely shut itself down as a precaution.
red operational light 2 (E) illuminated High Your boiler has failed to ignite several times or has potentially gotten too hot, causing it to shut down for safety.

Ideal Icos HE 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.

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