A
Axor
My first post and I hope you can help otherwise I will have replaced most of the parts! 
No Hot water
The PRV was stuck open and this must have been dragging a lot of rubbish through the system, the PRV has been replaced and so has the membrane on the
flow switch again this had a fair bit of crud in it, the DHW filter/limiter was also taken out and cleaned at the same time.
All back in place but the problem remains, turn the hot tap on and the system fires up with the water temp rising, then it stops heating the water and the light flashes indicating "Excessive temp on the primary circuit".
Anyone able to point me in the right direction?
Thanks in advance
No Hot water
The PRV was stuck open and this must have been dragging a lot of rubbish through the system, the PRV has been replaced and so has the membrane on the
flow switch again this had a fair bit of crud in it, the DHW filter/limiter was also taken out and cleaned at the same time.
All back in place but the problem remains, turn the hot tap on and the system fires up with the water temp rising, then it stops heating the water and the light flashes indicating "Excessive temp on the primary circuit".
Anyone able to point me in the right direction?
Thanks in advance
