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Andrew Smith
Andrew Smith, Engineer
Category: UK Plumbing
Satisfied Customers: 3629
Experience:  Domestic Gas, Commercial Gas, LPG, Unvented Hot Water, Part P Electrical, Commercial Catering
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Worcester 24i boiler keeps going out on heater and you can

Customer Question

Worcester b 24i boiler keeps going out on heater and you can hear a ticking noise. When hot tap on boiler lights fine X
Submitted: 1 year ago.
Category: UK Plumbing
Expert:  Andrew Smith replied 1 year ago.

Do you get any fling lights when the heating cuts off?

How long does it stay on for on heating?

Expert:  Andrew Smith replied 1 year ago.

Your boiler has a twin pass heat exchanger which means the hot water and the heating circulate through 2 separate sets of pipes. Your boiler does not have a divertor valve.

The pump only fires for heating, you need to check this spinning as it sounds like it is stuck.

Customer: replied 1 year ago.
Stays lit for 30 secs but I've noticed it will keep lighting and going out ever so often. The radiators do get warm . Also if we run hot water a while then turn off it will stay on for ch. is there anyway to unstuck pump (light tap)
Expert:  Andrew Smith replied 1 year ago.

Inside the front cover is the pump.

On the front of the pump there is a screw in the centre, take this out (put a tub under to catch any water) and give the insides a twist with a mall flat blade screwdriver.

Let me know if this cures it - you can also see the insides of the pump spinning when you leave the screw out.

Customer: replied 1 year ago.
I couldn't turn it as there was nothing to grip on. But the heating was on still when I got home and after draining the water from inside pump and topping up its still running
Expert:  Andrew Smith replied 1 year ago.

Do you have full heating but just slow to heat up as the boiler keeps turning off?

Perhaps it is circulating slowly or the water quality is creating a problem?

Customer: replied 1 year ago.
It's failing to stay lit on heating now
Expert:  Andrew Smith replied 1 year ago.

Is it still ok on hot water?

Customer: replied 1 year ago.
Expert:  Andrew Smith replied 1 year ago.

It sounds like the pump has failed and the boiler is just reaching temperature now.

Are the pipes under the boiler really hot?

Customer: replied 1 year ago.
Expert:  Andrew Smith replied 1 year ago.

Ok, you need to check the pump by removing the front screw.

If you cannot do this then you will need to get someone to check this for you.