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Hi I have an Ideal ISAR m30100 combi boiler, which is about 18 months old. Over the weekend it has decided to keep the radiators on constantly no matter what the thermostat or time clock are switched to. The only way I can cool them is by powering the boiler down completely, but as soon as...

My combi boiler has developed a strange problem in that no matter what setting my time clock or thermostat is on my radiators remain hot. The boiler says it is still on standby, but the only way to get them back cold again is by turning the boiler off totally. Firstly am I going to damage the...