Ideal Isar HE24 problems

[GSXRCarlos]

Hi all,

Have done a search and had a read around the subject but no real answers.

Boiler has been working fine until this morning when i tried to have a shower and no hot water.

Turned it off and on again a few times, turned it off at the wall etc but nothing.

It shows error code H9 and sometime L9.

Drained the full system thinking it might be a blockage no change. Have also tried to 'remove' the pump, but the silver bolt in the middle just seems to spin once i've undone it

Any help would be appreciated

Thanks

 

[Agile]

Draining the system is the last thing that you should do!

Now you may get airlocks.

You will also have drained away the inhibitor whihc will need to be replaced.

The central screw may need prising out if its a Grunfoss.

Tony

 

[Bomb]

Sure that is a pump fault the pump seem to stop and start

 

[GSXRCarlos]

Hi,

Thanks for your replies. We've had another look and the pump spins no problem.

Should the control thermistors be showing 0 on an ohm meter when hot or should there be resistance?

 

[dcawkwell]

Hi,

Thanks for your replies. We've had another look and the pump spins no problem.

Should the control thermistors be showing 0 on an ohm meter when hot or should there be resistance?

No they shouldn't.
If you have measured them both and got 0 I think you've done it wrong.

 

[Garfeild]

Hi,

Thanks for your replies. We've had another look and the pump spins no problem.

Should the control thermistors be showing 0 on an ohm meter when hot or should there be resistance?

Thermistors should be roughly 10k at 25 deg. But they are not your
Problem
Generally speaking L9 is lack of circulation/overheating poss pump
Or ilack of system pressure,which I assume you've checked?
Other than that,I recommend you get someone in to fix it

 

[Dan Robinson]

Seen this with the diverter cartridge jammed too.

 

[GSXRCarlos]

Garfield,

Overheating definitely seems to be the problem. That's why I wondered if it was the thermistors. I've got a mate coming to see me but he's been busy with everyone else's problems.

Dan, thanks for that. Might help us out

 

[Agile]

If a boiler is properly set up then overheating is almostly always caused by a lack of flow. Pump or sludge!

Tony

 

[GSXRCarlos]

Agile,

Thanks mate - i've got another plumber coming to see it tonight - the missus has been on at me

I'll let you know what he says

 

[leytonjc]

possibly a blocked heat exchanger, was a service agent for ideal for 3years, came across this fault more than 50 times, heat exchangers changed under warranty.

 

[shambolic]

Does it do it on heat and hw ?
If only on hw possibly plate hex blocked, if oly on heat then possibly a system problem.
On both then pump or main hex.

 

[snb]

l9/h9 can also be caused by blocked aav. Top part of exchanger can be full of air.

Afraid this work is has to be done by gassafe enginer as in combustion area