ideal isar HF error...

[phil hair]

a customer replaced a couple of valves on his heating system,(under cooker heater) and when he refilled, was greeted with the HF error.

I thought he had probably air locked it, so bled the pump, and it fired up, but only managed LF. then after a couple of resets went back to HF. Sometimes the pump jams, started again with a knock. The fan does not run, but is this because of the HF stopping it, or the fan causing HF? for some reason i didnt check the flame probe was ok. woops

I am at a loss to why draining some water would cause this? apart from the usual pos answer.

any ideas?

thanks

 

[ShaunCorbs]

No flame sens so probes I would say

 

[Sharp Point]

Check the ionisation lead that runs up the left hand side at the front, the black insulating outer cracks all over and shorts to the heat exchanger.