Worcester junior 24i tripping out

[arfyarfy]

Hello, I have had this combi boiler for 5yrs now and all been ok but recently when the c/heating comes on & radiators are just getting warm it trips out and switches off with the red reset light flashing. Once I reset it works again but soon as the radiators get up to temperature it trips out again. Now if i turn the rad temp dial on the boiler down to less than halfway it functions fine but the house takes forever to heat up, but then if i turn the rad temp dial up past halfway mark it trips out again? I'm not sure what it could be, hoping somebody on here has some idea? Thanks.

 

[boilerdoktor]

check the condensate isn t blocked at the drain
check your gas is on ( have you a hob?)

failing that you should get worcester or an enginner out as it could be many things........faulty gas valve/pcb/more likely a blcked main heat exchanger

 

[arfyarfy]

Thanks for your info, yes gas is definitely on (gas hob works fine). Where do I check the condensate? Would the heat exchange unit still clogg up if i live in a soft water area? After doing some research it feels like the 'overheat thermostat' is causing the trip out because its only when I increase the radiator temp setting that the boiler switches off. But maybe I'm wrong.... Might need to get an engineer in.

 

[boilerdoktor]

the thermostats do not fail on these. it will be sludge in the system ie inside your radiators.

 

[arfyarfy]

Yes I probably have got sludge in the system as some radiators downstairs stay cool at the bottom 1/5 when running. Might get a powerflush done this summer & get engineer to check the boiler over.