Ideal Mini C24 No Central Heating

[locosaki1978]

I have been to the above boiler today to recitfy a fault,Now there was no instructions(fault finding guide etc)

The hot water side of this combi works fine but when I ask for C/H I get nothing at all then after waiting for a minute or 2 the boiler will ignite for 10 seconds then cut back out,As I say when I ask for C/H at the time clock I get nothing,No Pump turning No fan,The boiler is just dead !!!

Anyone got any ideas on what might be wrong,I've not had much dealings with these at all

Cheers Guys

 

[shambolic]

Remove the external controls from the wiring harness and put a link in between 1 and 3 this completely takes out ext controls then see it it comes on!

 

[gas4you]

I would hasten to point out, the specific Volt free terminal block.

Someone who is not used to these might not realise this

 

[shambolic]

I would hasten to point out, the specific Volt free terminal block.

Someone who is not used to these might not realise this

The new one with the single board now has 240v on these terminals
Try it next one you are at stick yer meter on the volt free contact terminal and low and behold 240v.
Blooming technical should have told us that before they changed it!
They still ask for volt free contacts though on external controls to protect the pcb although not needed now at all!

 

[gas4you]

When did they change to this

 

[Rob]

If its one of those silly integral digital timers with 20 make sure its on properly.

Best way is to slide red pin to bottom and just use on/off.

 

[locosaki1978]

Thanks for the replys guys,

I did move the red pin on the time clock to bottom and switched to on position.

If it were external controls were at fault surely the boiler would either remain off or stay on,this boiler fires up intermittingly then goes back off again !!!
There also appears to be no heat at the flow coming out of boiler although the flow to the pump does get hot when the boiler fires up for a brief moment.The pump also seems to be free,works fine on H/W anyway !!

As I said I have no instructions for this,Can some give me a brief sequence of operation for this.I.E Calling for heat,Pump runs surely then the flowswitch will activate !!!


Someone I spoke to today said it could be a fault with the domestic flow swith,The one with the red LED light on the left of pump !!

Any thoughts

 

[gas4you]

Check to see if the primary flow switch is making when the pump starts.

Could be the small diaphragm, but these switches are notorious for not making, usually due, I think, to muck in the hydraulic block.

Have fixed a few with a piece of hard rubber inserted into the microswitch, to make up the small distance it fails to travel.

From what one of my local Ideal engineers tells me, they do this to on many occasions.

 

[ChrisR]

Craig you need the manual - the beast has fault codes via LED's inside. SHould be on the Ideal or Biasi site. Biasi Garda, wasn't it?
Better than even bet it's promary flow. CHeck the AAV is open and the pressure's uppish. Fill it very slowly.

 

[Agile]

The pump only runs for about five seconds. If the flow switch is not made then the pump shuts down to prevent dry running.

It sounds as if the pump impeller is blocked with dirt! Did you inspect it?

I think you need some training in combi fault finding.

Not sure if I could recommend Mr Combi though. Not enough people come back singing their praises.

Tony

 

[locosaki1978]

Cheers Guys,The help is much appreciated.

Primary flowswitch,now is this the switch I was refering too with the red led light on it,This is on the left hand side of the pump but to the right of the boiler ??

On the left handside of the boiler I have the actuator that sits on top of the diverter valve and just below that I'm assuming It's the microswitch for domestic H/W (this is in a clear case)

Cheers Craig

 

[locosaki1978]

Hi Tony,

The first thing I did was to inspect the pump,The impeller moves with ease !!

When I run hot water as I say pump fires up and boiler works fine.

Craig

 

[gas4you]

No, you've got the flow switches the wrong way round. HW is the one with the red light on, promary is bottom right of the DV.

It's rare to go, but if the microswitch (clear) isn't making, check the diaphragm.

 

[Agile]

It is rather confusing what you are telling us about the boiler but that may well be explained by your apparent lack of understanding of how the boiler works.

My best guess based on an incomplete description of whats happening is that the diverter valve motor is not depressing the pin during CH delivery.

Have you removed the actuator and seen if it moves?

Have you manually depressed the pin and seen if that produces CH ?

Tony

 

[locosaki1978]

Hi,

I did depress the pin when I removed the actuator and I still got nothing,When I removed the actuator I tried switching boiler on then off but the boiler still deosn't come to life and there was no movement at all at the actuator !!