commuter Posted October 23, 2007 Share Posted October 23, 2007 thermocouple cost me £25 last time I needed one and took about 20 minutes to fit Link to comment Share on other sites More sharing options...
Complete-Heat Posted October 23, 2007 Share Posted October 23, 2007 could be the thermo coupler It wont be the thermocouple. If that had gone the boiler would not fire up at all. The overheat stat is tripping, maybe due to faulty pump. Could also be a faulty thermister. Difficult to say without knowing the make and model of combi Link to comment Share on other sites More sharing options...
Twiglet Posted October 23, 2007 Share Posted October 23, 2007 It wont be the thermocouple. If that had gone the boiler would not fire up at all. The overheat stat is tripping, maybe due to faulty pump. Could also be a faulty thermister. Difficult to say without knowing the make and model of combi Really? Our pilot was going out several times (I say several, I mean 6-10, pain in the bum) a day and was difficult to re-light but would, we assumed it was the thermocouple. Gas man came out, replaced the thermocouple and it all works fine Link to comment Share on other sites More sharing options...
Gavbriggs Posted October 24, 2007 Share Posted October 24, 2007 thernistor or o/heat stat as any said, would be the first and usual suspects Link to comment Share on other sites More sharing options...
Complete-Heat Posted October 24, 2007 Share Posted October 24, 2007 Really? Our pilot was going out several times (I say several, I mean 6-10, pain in the bum) a day and was difficult to re-light but would, we assumed it was the thermocouple. Gas man came out, replaced the thermocouple and it all works fine All the thermocouple does is generate a small electrical charge when hot. This keeps the gas valve open for the pilot, and also allows the burner to fire on full. When its worn out it gives the symptoms you describe and you have to continually re-light the boiler. Replacing fixes the problem you described. However, 'pfifes' is not having to continually re-light. Her boiler may also not have a thermocouple. Thats why i asked for more info. When 'pfifes' hot water or heating is getting to a certain temp then the boiler is turning itself off. Thats why i suspect either a thermistor or O/H stat. As i said, Boiler make and model would be helpful otherwise the term 'needle in a haystack' comes to mind. Link to comment Share on other sites More sharing options...
Vanos Posted October 24, 2007 Share Posted October 24, 2007 Similar problem with my Worcester Combi. Link to comment Share on other sites More sharing options...
dan2802 Posted October 24, 2007 Share Posted October 24, 2007 i had a similar problem on my glow worm fuel saver II boiler. changing the overheat stat cured it, in fact its never worked so well. pity its so damn expensive to run. Link to comment Share on other sites More sharing options...
moonshadow42 Posted October 27, 2007 Share Posted October 27, 2007 Hi pfifes, absolutely same problem for me buddy . In addition to these, my broiler is taking too much time to cool down .Normally it used to got cooler within 10 minutes earlier. But now that is not the case. Any advice regarding it will be fine. Link to comment Share on other sites More sharing options...
finbaby Posted October 29, 2007 Share Posted October 29, 2007 try switching on! Link to comment Share on other sites More sharing options...
Gavbriggs Posted October 29, 2007 Share Posted October 29, 2007 Hi pfifes, absolutely same problem for me buddy . In addition to these, my broiler is taking too much time to cool down .Normally it used to got cooler within 10 minutes earlier. But now that is not the case. Any advice regarding it will be fine. whats no cooling? the boiler or the radiators. or both? could be the pump that isnt running, can you hear the pump running? try no to confuse this with the fan, if you can see the pump there should be a large screw in the centre, unscrew this, there will be a little water in there, mop up with kitchen tissue and make sure it doesnt go on the electrics. now, place a screwdriver in the hole and turn the pump manually. now run the boiler and carefully put the driver in, you should feel the pump going round. Link to comment Share on other sites More sharing options...
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