Ideal ICOS HE12, No CH but have HW

DarrenD · 4 Mar 2007

After the electric tripping out in the week the boiler doesn't stay ignited for the CH at all.

It starts the ignition sequence, ignites for 30 seconds and then displays the code that there is no demand for CH.

The HW is fine, I have bled the system, which didn't help.

Also, it doesn't respond to the Reset function on the front panel of the boiler.

Any ideas?

Agile · 4 Mar 2007

Has water leaked internally on to the display module?

Tony

DarrenD · 4 Mar 2007

No, it seems to be functioning correctly and there is no water residue.

I have examined it closely and there seems no water at all

HarrogateGas · 4 Mar 2007

Being the Icos and just a plain boiler if its heating hot water but not heating id suggest your boiler is fine and the fault lies elsewhere on the system. The boiler fires exactly the same for heating or hotwater.

gas4you · 4 Mar 2007

What code is it that it's displaying?

Agree with harrogategas, are you sure its an Icos and not Isar?

DarrenD · 4 Mar 2007

Where else is system could it be?

The radiators were functioning fine before the power tripped out (this maybe completely unrelated, I realise)

They have individual thermostats, so I understand one could fail, but not all of them.

gas4you · 4 Mar 2007

Do you have a wireless room stat by any chance? If so could need re-locking with base unit.

Have you tried reset button on programmer etc?

DarrenD · 4 Mar 2007

gas4you said:
What code is it that it's displaying?

Agree with harrogategas, are you sure its an Icos and not Isar?

Its definitely an ICOS, unless it has an incorrect front panel on it.

It isn't displaying an error code, its just a 'C' with a flashing LED like it has when its igniting, but there is no noise from the boiler unless I demand Hot Water from it.

Or if there is no demand at all, it displays '0' as normal.

Agile · 4 Mar 2007

Sounds like a faulty microswitch in a motorised valve but that does not sit with your description that the boiler makes some noise on a CH demand!

The boiler does not know where its heat is going to go.

Tony

gas4you · 4 Mar 2007

C is just the boiler in heating demand mode, either hot water or heating. C is for central heating on the combi version as oppsed to d for domestic hot water. Slow flashing light is boiler up to temp and just circulating. Quick flashing light is when ignition sequence starts, constant light is burner alight.

Try resetting at fused spur, leave off for 30 secs then try again.

corgiman · 4 Mar 2007

Just how do you demand hot water

out of interest?

Agile · 4 Mar 2007

Has the PCB been changed as far as you know?

It is the same PCB on both models but the links have to be repositioned according to the type of boiler.

Does anyone know how it responds if a combi set one is put in a heat only version?

Tony

gas4you · 4 Mar 2007

On the Icos you dont get a different code. Just the isar. Ideal have just used the same display etc, so whether it is heating or hot water on at the timer/demand boiler always will display C

DarrenD · 4 Mar 2007

gas4you said:
Do you have a wireless room stat by any chance? If so could need re-locking with base unit.

Have you tried reset button on programmer etc?

I'm not sure if its wireless. As in, I don't know if its linked into the boiler, but there is a seperate unit to the boiler

All I could tell you is that its a Danfoss, and that the system is fairly new, >12 months.

I've just tried the Reset button and so far, so good.

I did try the reset button the other day, and it didn't do anything. I must not have fully depressed it.

If its that simple, I feel somewhat foolish.

gas4you · 4 Mar 2007

Agile said:
Has the PCB been changed as far as you know?

It is the same PCB on both models but the links have to be repositioned according to the type of boiler.

Does anyone know how it responds if a combi set one is put in a heat only version?

Tony

This will be proved at initial turn on. The number displayed in the digi read out is different for each boiler!

What number does it display?

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Ideal ICOS HE12, No CH but have HW

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