Radiators randomly came on and wont turn off.

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16 Feb 2014
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Hi guys,
Thermostat is in the OFF position but the boiler is on and the radiators are piping hot.

If i turn the hot water on the boilers light turns on for the RADS but lights up as it should for the HW. If i turn the HW off, the light for HW turns off, as it should but, the radiator light is ON again. Eeek.

Whats going on here? internal fault in the boiler?
 
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Might be Frost protection kicking in which means main thermistor fault, if you turn selector dial to summer mode and boiler stops then frost protection most likely fault.
 
What happens if you move the slider on the programmer from "CONT" to "OFF"?
If I do that then the hot water is back. Radiators aren't on BUT.. if i then turn the thermostat ON, the radiators still don't come on..

What do you think? Faulty thermostat? it doesn't actually feel right when i turn the dial, normally it clicks when you turn it on but now it just click like a button.. its odd, definitely doesn't feel right.
 
Might be Frost protection kicking in which means main thermistor fault, if you turn selector dial to summer mode and boiler stops then frost protection most likely fault.
Which ones summer mode bud? I normally keep it on CONT.
 
Yep, sounds like a faulty thermostat to me. Worth testing with a multimeter before replacing though
 

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