Ideal combi heating running constantly

[mutley racers]

A client has sent me a couple of the above boiler. Once the heating comes on, it stays on. Am not sure what boiler it is but you guys will probably tell by the controls. It has a cm927 wireless stat to it. Are there common faults I should be looking for with this boiler? Stuck diverter valve? and so on. Oh, he also mentioned something about the lights showing that the frost protection is constantly on. Is this the case even if the heating is not on? They will be just lit to let you know in case it gets cold.

 

[shaky]

Try linking out external controls to rule them out

 

[mutley racers]

hey mods, can you tell me how to delete images or can you delete the above post as i don't want to display an image on here

 

[mutley racers]

Try linking out external controls to rule them out

What do you mean by linking them out? Take them out and Put a link in where they are connected to the boiler? Like you have to take out a link usually to put external controls in?

 

[IDCHAPPY]

It's an Ideal combi....
Think it's a mini of some description?

 

[IDCHAPPY]

By the looks of the CP it's a mini HE 24/28/32

 

[galaxy_plumbing]

i think it Dell (monitor) or are we talking about the boiler?

 

[mutley racers]

i think it Dell (monitor) or are we talking about the boiler?

10/10 feller

 

[stevetheplumber]

yes just replace the link as it came originally this rules out external controls but just testing for live coming back is as good

 

[mutley racers]

yes just replace the link as it came originally this rules out external controls but just testing for live coming back is as good

Great, thanks steve. This I shall have a go at. So I can just check to see if the switch live is turning on and off with the stat, rather than taking wires out

 

[Ermintrude]

Yes put finger on n and one on s/l get custard to switch on and off.

Or use a multimeter?

Put programmer in to constant CH first.

 

[buckley plumb]

that is the same as a biasi boiler . if the customer said the frost stat warning come on the check there is not an external frost stat fitted if not check the thermistor

 

[arran197]

Ye, Ideal Mini. There's a magnet in the hall effect sensor to switch on the hot water, pop it off the manifold and check to see if that switches the boiler off as you could have 2 faults. A passing diverter valve and a sticking magnet in the hall effect sensor manifold. Other than that it could be as has been said in previous post, an external control that is staying on. You could remove the room stat (easy to do on a Drayton RTS1, just unhook it) and see if that stops it. If it does, you know it's a control.

 

[mutley racers]

Going to this boiler tomorrow and so I was looking up the wiring info. And it say's this 'he switch contacts of any external programmer,room or frost thermostat must be volt free.
Connecting a switched live feed to external controls
terminal block may be dangerous and will result in
serious damage to the boiler'. What does it mean? because when you fit a new wireless stat, the receiver needs a live and a neutral plus the switch wires. But, I am guessing these are volt free?

 

[GrahamM]

Going to this boiler tomorrow and so I was looking up the wiring info. And it say's this 'he switch contacts of any external programmer,room or frost thermostat must be volt free.
Connecting a switched live feed to external controls
terminal block may be dangerous and will result in
serious damage to the boiler'. What does it mean? because when you fit a new wireless stat, the receiver needs a live and a neutral plus the switch wires. But, I am guessing these are volt free?

Volt free stats still have a live/neutral. It is the stat switched contacts that are volt free.

 

[mutley racers]

So chaps, I went to look at this boiler today and my 1st port of call was the wiring. You can see how I found it in the top diagram. It's not how the relay instructions said it should be. Any way, I disconnected this and put the original link in to see if this would help. It didn't. It wasn't flashing as if it was in frost mode any more, but that it was CH mode. But, It still wouldn't turn off using the time clock on the fascia. I thought I may as well wire the receiver in the way it says to in the receiver instructions and again, it would fire up but showing it as the frost protection was on. As soon as I turned the stat down, it would turn off but automatically start up again using the frost protection programme. Can someone please explain how the actuator works on a diaphragm diverter valve? Does water flow through it and force the diaghragm up pushing a spindle and making a contact in the actuator? As I did take the actuator off and the boiler would still fire up and run.

Hope that makes sense.

Cheers fellers

 

[mutley racers]

been trying to research this fault but nothing I have found like it. Am thinking maybe I should try a pcb. A nice reconditioned one. what do you thinks?

 

[mfgs]

On the cm927 B is the switch live, not C so I think you have wired it wrong.

 

[mutley racers]

On the cm927 B is the switch live, not C so I think you have wired it wrong.

Forget that bottom picture it is wrong. My mistake, it is neant to be coming from B in the diagram. And I have wirwd it going from B but it's still going pear shaped

 

[mutley racers]

Volt free stats still have a live/neutral. It is the stat switched contacts that are volt free.

Ah ha, so, the way that I found the wiring in the top picture was actually wired with a live switch then? And it says in the manual that, this can cause damage to the pcb and even be dangerous. So, I am leaning towards the pcb on this boiler too because of that particular reason. I

I did call ideal and they suggested it might be the pcb.

 

[mutley racers]

Are the cm927 wireless room stats switch terminals volt free? I see in the instructions that they are. But today I was arguing with ideal technical as she was saying my fault was that I had wired a live switch live into the boiler.

 

[Ermintrude]

Terminals a and b volt free?

 

[mutley racers]

Isnt that what it says??

 

[Ermintrude]

 

[mutley racers]

So what does it mean in the above sentence I posted? 2 wire volt free connection for combi boiler