back boiler issues-advice please

[blurayaddict]

hi guys and girls recently had probs with my pilot light going out on my back boiler but just replaced the thermocouple today and pilot light seems to be staying on,,,,,,,now i have problem with tempertures of the rads they are far to hot and my thermostat on wall is only set at between 15 and 20 and i have tried to turn the temperature dial where my back boiler is but i dont think its working and never has been since i moved in ,,,,,,,,,,,,,now im not sure if when the back bolier is on switched on and heating the rads it does not seem to turn off and on when the water temp cools down it looks as thou its just staying on all the time,,,,,,now this has not always been the case and the rads have been too hot for a few weeks now--sorry to babble on hope it makes sense-----thanks

 

[AWheating]

who replaced the thermocoupler?

 

[Gas Jim]

Hi
Have you checked the thermostat on the the back boiler its self? I had on bbu last week when the thermostat on the boiler failed, overheated and melted the thermostat to the heat exchanger!!

 

[5544]

you need to change the temp control unit / dial regardless. it is really dangerous to suspect that that is not working. do you hear the water boiling in the heat exchanger when it on?

 

[cdgas]

If you changed the thermocouple did you take off the front panel from the bbu? If so did you put the Thermostat Phial back into its pocket in the heat exchanger?