Ideal Isar HE 35 cutting out

[Sandeep89]

Hi Guys,

Customer has a Ideal Isar HE35 when the boiler fires up for ether hot water or heating, there is knocking noise which seem to he coming from inside the flue manifold.

Boiler fires up, knocking noises can be heard from some seconds, after this the boiler cuts out and water squirts out of the AAV. The boiler then re-fires itself after a little while and the same thing happens again.

Any ideas what could be causing this.

Thanks

 

[Deleted member 120897]

Sounds like it’s overheating. Weak pump, faulty pump, blocked hex, et al.

 

[Sandeep]

Sounds like it’s overheating. Weak pump, faulty pump, blocked hex, et al.

Thanks, would this also then be the cause of water slightly squirting out from the AAV.

 

[cjg]

its about time for a new boiler, they where never the best, poss blocked return pipe?

 

[Deleted member 120897]

Thanks, would this also then be the cause of water slightly squirting out from the AAV.

Could be, or could be leaking aav and check the expansion vessel hasn’t lost its charge.

 

[Sandeep]

I also noticed that the pressure gauge is rapidly moving up and down whilst the boiler is working, is it meant to be doing this