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Andrew Smith
Andrew Smith, Engineer
Category: UK Plumbing
Satisfied Customers: 3623
Experience:  Domestic Gas, Commercial Gas, LPG, Unvented Hot Water, Part P Electrical, Commercial Catering
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Ideal logic + heat 24 boiler appears to be stuck on standby.

Customer Question

Ideal logic + heat 24 boiler appears to be stuck on standby. Can get it going by repeatedly turning it off and on
Submitted: 6 months ago.
Category: UK Plumbing
Customer: replied 6 months ago.
Expert:  Andrew Smith replied 6 months ago.

For hot water and heating?

Customer: replied 6 months ago.
both are "on" on the control panel but neither work. When I turn on and off after several times I hear the water coming through and then it will work, but next day back to same problem!
Expert:  Andrew Smith replied 6 months ago.

For both not to work it could be a few things like the pump, the fan or the pcb.

Are you able to check if the pump is spinning?

Customer: replied 6 months ago.
Not sure what that would be but looking at it and nothing is moving/no sound.
Customer: replied 6 months ago.
Could it be an airlock?
Customer: replied 6 months ago.
Some times when I turn it off and on, when I give pipes a knock, I hear the water coming through pipes and it works, like now just got it going, but like I say, tomorrow will be same problem no doubt
Expert:  Andrew Smith replied 6 months ago.

http://assets.grahamplumbersmerchant.co.uk/product-docs/12512/12512.pdf

Your pump is at the side of the boiler, but the boiler need a flow of water through it to run.

Do you get any strange codes on the front when the boiler is not running?

It could be a sticking motorised valve also preventing the boiler from firing

Expert:  Andrew Smith replied 6 months ago.

Also, if the boiler is sat with a 0 on the screen, then it is not being told to run by the controls.

Customer: replied 6 months ago.
No strange codes, only 0 and then C when I get it working.
Expert:  Andrew Smith replied 6 months ago.

C means it is being told to run.

It sounds like a control fault, rather than the boiler

Customer: replied 6 months ago.
Ok so what's the next step?
Customer: replied 6 months ago.
Buy a new one for £4.99 hopefully! ;)
Expert:  Andrew Smith replied 6 months ago.

Do you have 2 silver boxes on the pipework?

Customer: replied 6 months ago.
Customer: replied 6 months ago.
Both have a slide switch set on auto
Expert:  Andrew Smith replied 6 months ago.

There is a lever on one end.

There will be one for hot water and one for heating.

When you turn on the hot water or heating the lever should go slack and the pump will run along with the boiler.

Can you check this?

Customer: replied 6 months ago.
Both were slack touched first one and boiler fired up
Customer: replied 6 months ago.
One on left
Expert:  Andrew Smith replied 6 months ago.

Up to the cylinder or down to the heating?

Turn the heating or hot water on one at a time and you will find your problem

Expert:  Andrew Smith replied 6 months ago.

Each of the valves has a microswitch built in and the valve must open fully to make the switch and fire the pump and boiler

Customer: replied 6 months ago.
Just tried to turn heating and water on separately on control panel and nothing happened all valves are fully opened, the ones with red handles
Expert:  Andrew Smith replied 6 months ago.

The motorised valves with the levers?

Customer: replied 6 months ago.
The silver ones? The boxes? They are all the way to automatic but beside manual on other side it also says "open"
Expert:  Andrew Smith replied 6 months ago.

They are spring return valves that power open.

I just need to know if they go slack, this means the valve is open internally

Customer: replied 6 months ago.
When I turn heating/water on on control panel neither go slack, I can push them but neither change how hard I have to push
Customer: replied 6 months ago.
Are on*
Expert:  Andrew Smith replied 6 months ago.

The levers on both should both move with a semi hard push across to the open (latched) position behind the stay, and then spring back.

When the valve is open electrically you should be able to wiggle the levers as there will be nothing behind them

Customer: replied 6 months ago.
Both pushed and sprang back, both wiggle once back
Expert:  Andrew Smith replied 6 months ago.

Ok, they should both open electrically unless they have failed?

Are you able to trace the wires back to the junction box and check power to the brown wire on each valve to confirm this?

Customer: replied 6 months ago.
It says turn main power off before removing cover, not sure how to test it other than look at it, should I turn main power off and take cover off?
Expert:  Andrew Smith replied 6 months ago.

You will need a multimeter to carry on any further to check for power to the valves

Customer: replied 6 months ago.
Ah right I don't have one of those my father in law might, can we continue this tomorrow evening? Thanks
Expert:  Andrew Smith replied 6 months ago.

No problem.

You will need to do the test above first.

Customer: replied 6 months ago.
Ok thanks
Expert:  Andrew Smith replied 6 months ago.

No problem - just come back when ready

Customer: replied 6 months ago.
Hello, I have one of those meter things but I have no idea how to work it and I don't want to electricute myself! Got an engineer coming out tomorrow...just got it going again by turning on and off and pump is working, but like I say need it working all the time!
Expert:  Andrew Smith replied 6 months ago.

Ok, they will be able to sort it.

It would be interesting to find out what your particular problem is.

Customer: replied 6 months ago.
Will let you know thanks for your help
Customer: replied 6 months ago.
I was at work. Tells my wife its not working as it is turned off on the control panel...as you can guess he is coming back tomorrow ...
Expert:  Andrew Smith replied 6 months ago.

Did you get this sorted?

Customer: replied 6 months ago.
He is meant to be coming back today
Customer: replied 6 months ago.
It's th control box that is broken, he is off to get one now
Expert:  Andrew Smith replied 6 months ago.

ok, glad you are sorted then

Customer: replied 6 months ago.
Thanks again

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