Repair of gas boiler - On constantly

Found 13th Mar 2018
A friend of mine has mentioned that their gas boiler is running constantly and the heating in their property is on non-stop. The only way to stop this is to switch off the boiler. Switching it off at the thermostat doesn't work.

The boiler is also giving an error code about an outside sensor fault, but as far as we are aware it doesn't have an outside sensor.

I'm trying to help them find a company who will look at this and fix - I've had a quick look at the usual Homeserve, British Gas, SSE and some others.

Can anyone provide any recommendations ?

Thanks in advance
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Happened to mine also, it's not a Ideal Icos by any chance? Mine has now completely stopped working(no lights or anything on boiler) engineers have stated the PCB is at fault and will need to be replaced! Also another thing it could be the Actuator or 3 way Valve could be sticking.
Mine had this problem and I simply pushed the thermistor back on as it had come loose (sensor on the outside under the housing which detects the water temperature)
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