please help Wickes 50 boiler keeps tripping off

daveaf · 12 Dec 2008

Old balanced flue Wickes 50 (Halstead Boiler).

Everything working perfectly but today I decided to drain it down and put in some cleaner. It was not dirty when i drained it as i only did it a few months back but never added any cleaner.

Now I have refilled it and got rid of ALL the air and bled the pump so its not any of that. I have done this loadsa times before and I know how to bleed my whole system.

The pilot light is quite happily lit when the boiler is turned to off so I know that the thermocouple is ok.(Ive just replaced it).
But everytime I turn the boiler temp on to any number (1-6) the boiler fires up runs quite happily for a few minutes everything starts to warm up so it is circulating but then it just trips out and the pilot goes out. It will relight straight away but then it just does the smae again

Its almost like it thinks the boiler is overheating but its not??

Please help as Im cold and need a bath.

I know its an old boiler but it I do not have the money to change it at the moment.

skowi187 · 12 Dec 2008

sounds like an overheating problem. somehow water is not being dispersed around the system as it was designed to. maybe draining it down shifted some sludge which has now caused a blockage??

daveaf · 12 Dec 2008

I dont think its blocked because when it runs for 5 minutes or so before tripping, everything gets nice and hot (all the rads in the house and the inlet and outlet of the hot water tank??

Im going to leave the boiler off but with the room stat on overnight so it continues to pump around cold.

Any other suggestions?

gas4you · 12 Dec 2008

Turn off all rads except one and turn off the HW. See if this shifts a possible air lock.

Have you bled the HW circuit? Did you set any zone valves to manual when you re-filled the system?

daveaf · 12 Dec 2008

Did not turn any zone valve positions, just turned off the water into the header tank, opened the bottom drain and the rad bleed nipples to drain down the last bit from the rads. Shut it all off, opened up water to header tank, refilled, bled it all ,fired up the boiler and its been tripping ever since

gas4you · 12 Dec 2008

Try what I have posted above, if not I would (sadly in your case) drain down and start re-filling again, opening any zone valves and bleeding the HW circuit as well.

daveaf · 13 Dec 2008

oops double post sorry.

daveaf · 13 Dec 2008

I have tried the above and left it all night, I am happy the system is air free now. I also shorted out the over heat stat temporarily to see if that was causing the problem but it still tripped out.

Surely the only thing that could be causing that to happen now is the pilot thermocouple or could the boiler stat be faulty.

gavinda · 13 Dec 2008

t couple then.

daveaf · 13 Dec 2008

right I have re adjusted the pilot thermocouple position slightly and (All Fingers Crossed) The boiler has cycled happily now for an hour so I think I may have sorted it

daveaf · 13 Dec 2008

Also appeared to have a partial blockage in the pilot gas line so I have removed it and cleaned it out and now the pilot light is far better

Fingers crossed its warming up now.

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please help Wickes 50 boiler keeps tripping off

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