Isar HE30 problems?

We have the Ideal DH30 Isar combi heater.
I am having a problem with it recognising the thermostat for the central heating. It is staying in ‘c’ mode all the time. The display reads ‘c’ and the boiler light is not flashing, although before resetting it was flashing.


The shared/loose valves are facing outwards and I haven’t touched these at all


The thermostat we have is Drayton
Digistat RF2 – wireless
This appears to be ok, it shows all the displays so it’s not a battery problem.

At the boiler we have the Drayton pad/display. It is showing the following:
Heating On: green light is on.
Receive ‘Alarm’: red light is on.
The green light comes on when I press the override 2 button.


A few days ago, a hot water tap was left to drip and into locked out the DHW mode, so all was reset at this time and perhaps this is when the problems started??

Just realised that the water pressure is at 4 – has been at 2 prior to this. Maybe my playing with resetting has done something to this??
So I’ve just turned everything off – fearing that it might explode on me!!

I have read the manual and searched the forums but no specific answers to this problem? I know I won’t be replacing this boiler with Ideal when the time comes.
We did have to replace the PCB about 6 months ago.

Any help really appreciated – I don’t want an enormous heating bill and will have to turn off CH manually until this problem is sorted (at least it is better than none at all!!)