Ideal Isar HE30 - DHW going to CH?

[chaotic_j]

I've took off the diverter valve head, the white lever on the side of it won't move at all - it's stuck facing the rear.

Inside where the spring attached to the white lever rests is a metal spindle, this is covered in a layer of black sludge.

Put the new diverter valve head on and still the same.. no DHW..

 

[casaco]

No, the head comes off without having to drain down, drop the pcb forward, turn diverter head to the left and pull, (see instruction manual). You can then run the boiler briefly on heating then hot water, if pin goes in and out the head is ok. You have to drain down to replace the cartridge though, there are only 4 bolts holding it, you will need a long reach allen key, 4 or 5 mm, can't remember. Sometimes you can free the diverter valve mechanism by washing it, but while you have it in bits might as well replace it, make sure you get the boiler serial number before ordering parts as they will ask you for it.

 

[chaotic_j]

Thanks casaco yeah I managed it after I posted my second to last message, very easy. I pulled the diverter valve pin forwards with a pair of pliers and run the DHW but still the same... rather alarmingly the pressure gauge spun round and 'clicked' so I turned the boiler off then!

The original diverter valve head now seems to be stuck in the opposite position to before i.e. white plastic tab towards the label area..

 

[gasmarc]

Happy days what do you expect from Ideal
Dont forget to get a gas safe registered engineer to check it afterwards as you would not want to be held liable for your actions

 

[casaco]

Thats because the diverter valve is waiting for a signal from the pcb to change back to heating or hot water, if you put the head back on it should move back into position. Now you have freed the pin the valve might operate properly, can't understand why the pressure gauge should have moved though, what is it reading now? Try and get it back to 1 bar when boiler is cold. Did the pin inside the head move in and out?