Ideal Esprit HE 24 Combi

[griftgalt]

Is not working and cuts out with an L9 code. Will not start again for some time until the heat exchanger cools, which is a good while.

Will fire up if left alone, pressure gauge fluctuates wildly before cutting out. It is overheating on the heat exchanger?

Manual is indicating a thermistor issue? but maybe be the pump or PCB, any ideas?

I would be grateful of the wisdom of the forum can advise

 

[ShaunCorbs]

All radiator trvs open ?

 

[Stu-B]

Circulation problem, maybe pump or blocked hex, need a suitably qualified engineer to take a peek