Ideal isar l9 fault.....again

[Sharp Point]

Evening guys and gals, just had a text from a tenant in a house I look after. An L9 fault has now developed( overheat) would this be the pump failing/ failed, non functioning auto air vent or sensor.

Thanks in advance

And yes, I know it needs ripping out.... but you know what landlords are like

 

[ShaunCorbs]

Could be the pump does the boiler run at all ?

 

[Sharp Point]

Won’t know until tomorrow