Ideal Icos he18

[adwt2004]

Hi there,

I have noticed a fault with my CH in that the grundfoss pump never stops running. It obviously can't be good for it and it's not quiet either and has become very annoying.

I took the cover off the honeywell control box (look likes a junction box with different sections for wiring) and I can see the pump over run terminals have been used and the links you cut to configure have set it for pump over run also. I rang ideal to ask about pump over run and they said the icos doesn't have pump over run and there is no where on their boiler to connect it up anyway. Is that true? If so i'm a bit confuzzled how something has been wired in by means of where on earth do the other end of those wires go?! Anyone give advice on questions above and what i can do. I do have a multimeter.

thanks

 

[shambolic]

No pump overrun or need for bypass as the boiler has a fan overrun ! Please change thread title to pump staying on 24hrs when system switched off.
Probably faulty end switch at one of your motorised valves!

 

[gas4you]

Is this a new installation?

Sounds as though it has been wired wrong at the JB

 

[adwt2004]

There has been a pump overrun wired in and at the top right hand side link six has been cut for a pump over run. It's a year and a half old installation. Installed before i moved in. Should i take a photo of it, would that help?

 

[mickyg]

yeh pictures are always helpful. I'm interested as to if it has an option for a pump overun like you suggest. Surely if its an option it can be used. Maybe our resident Ideal expert can explain.

 

[gas4you]

The Icos, apart from the system version has no option for pump over run.

I assume the pump over run we are talking about is in the Honeywell wiring center, the pcb version that you cut the built in links depending on your system set up.

 

[adwt2004]

Yes that's correct, The pcb has i think five terminals for a pump over run and they are wired in to. also link 6 at the top right hand side has been cut which according to the inside of the honeywell cover is for a pump over run. Ideal confirmed there is no pump over run on the boiler so i guess i need to find out where the wires are going. The pump is wired into another section on the honeywell board labelled pump.

What a mess, i will post a pic

 

[gas4you]

Easiest answer is to buy a new Honeywell wiring center, then wire it properly for your system.

 

[londonboy]

Or turn power off at spur, pull white sleeving off the two sides of the broken link (link 6), and twist the two wires together with pliers.
I've never cut the wrong links

 

[adwt2004]

Been a long time but have to ask whether repairing the link that has been cut is all i need to do? I'm quite happy to sort it out and maybe solder it as access is easy but what about the wires that are in the pump overun terminals, do i just leave them in situ?

I have some wires going into the pump terminals and another cable going into the pump over run terminals and link 6 is cut at present. Pump is contantly pumping but everything heating wise is working ok.

 

[adwt2004]

Here are the images, the black cable comes from my motorised valve and into the pump over run terminals according to the inside of the honeywell white cover. The pump is wired with a white cable to the standard pump terminals. And the links cut are shown. Can anyone help?

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• adwt2004
• 12 Oct 2009
• 3

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• adwt2004
• 12 Oct 2009
• 1

 

[adwt2004]

Just had another look and I believe i have an Y plan system. Three port valve

 

[londonboy]

Cut link L1

 

[adwt2004]

My wiring centre is wired with switched lives as per the diagram below

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• adwt2004
• 13 Oct 2009
• 1

Shouldn't it just be LNE connections? I've taken a look at the boiler manual http://www.idealboilers.com/docs/pdf/icos_he_manual.pdf page 24 and it does have room for 5 wires but i don't know why. Whoever installed it should be shot for doing it wrong, it was checked by a BC officer too, not what they know anything about boilers or controls.

Cutting link 1 refers to a two channel programmer and the boiler always being switched on which it isn't. It's only the pump that keeps chugging away constantly.

 

[londonboy]

Your boiler has 5 terminals only 4 are required.
Permanant live
Neutral
Earth
Switchlive

check connections at boiler and cross check with wiring centre.