ideal isar L9 problem. surprise, surprise! :(

[SimonJohns]

God these boilers are cak
ive got this problem on an isar he30 3 horizontals im looking at this afternoon before anyone asks yes im gsr and can work on boilers problem is im new to diagnostics yes i have done a course but still greener than th hills. if im successful and it works i will be chuffed gonna disconect the dryfire thermistor for 5 mins if that fails try turning the pump manually if that fails i will ask advice from the wiser heads.

For the price of a dry fire thermister. Pick one up and keep it to test with.
They can read good when normal. But when heated they can get a bit erratic

 

[jaguar66]

Thanks i will take your advice and pick one up let you know how i get on.

 

[jaguar66]

Hi just an update the dryfire thermistor being disconected got rid of the problem boiler fired and works fine for the time being anyway . When i opened up the case to get to the thermister it was all wet with like a brown sludgy goo round it what is this ???i dried it and plugged it back in and the boiler fired up ok but im not happy with this brown stuff i know the boilers are cak but they should not ooze it. thanks

 

[GrahamM]

You are spot on in your initial description of these.
If wet inside you will have a bit more work to do.
First I would check/clean sump and condensate trap. You will also need check/replace the turret gasket. Most start leaking at some point.
But if brown sludgy, sounds like you better order up a AAV and gasket kit.

Check the burner, earth pins, electrodes while you are at it.

 

[jaguar66]

Thanks for that Graham its the mother in laws boiler so ive got time to tinker with it but thanks for the explanation of what it is.

 

[Backboiler]

Baldy, was it the head only or the whole pump including the body?

 

[Kewat66]

Made a mistake today by attending a breakdown and forgetting to ask on the phone what was the make and model of the boiler!! Ideal Isar!! A small job turns into a real pain of a job. School boy error"

 

[JAH HEATING]

Rip it out an take it the scrap yard