Fd fault on Ideal Heat 15

[Sarah80]

Got fd code on Ideal Logic Heat 15. Had two plumbers out and no joy. It’s had a new water flow sensor, flush with sentinel x800 and refurbished grundfos water pump.
Boiler tries to light and water pump power light comes on but goes off immediately and boiler flashes fd again.
It’s heat only so I have no gauges, tank in airing cupboard. Thank you.

 

[ShaunCorbs]

Might be best to wire the pump temporarily to a plug top and let it run for 5 mins then try turning the boiler on etc

 

[Sarah80]

Might be best to wire the pump temporarily to a plug top and let it run for 5 mins then try turning the boiler on etc

Thanks for your reply, do you mean to wire it to plug top whilst it’s connected to pipes or to remove the head & see if it runs?

 

[ShaunCorbs]

Thanks for your reply, do you mean to wire it to plug top whilst it’s connected to pipes or to remove the head & see if it runs?

While connected to everything least you know if it’s the pump or the boiler then

 

[Sarah80]

While connected to everything least you know if it’s the pump or the boiler then

Thank you. We will try that and I’ll come back to you. Appreciate your help. We are so cold!

 

[Sarah80]

Thank you. We will try that and I’ll come back to you. Appreciate your help. We are so cold!

Ok, wired pump in to plug and ran off the mains. Power lights stays on and pump is running. Turned boiler on and same fd code. Any other suggestions? Thank you

 

[Sarah80]

Ok, wired pump in to plug and ran off the mains. Power lights stays on and pump is running. Turned boiler on and same fd code. Any other suggestions? Thank you

Weird this is but if I tap on the fernox filter above boiler the boiler light comes on and when I stop tapping it, the light goes off again! Its had sentinel x800 flushed through but could it still be a blockage?

 

[ShaunCorbs]

I would say pcb or a sensor as the boiler should fire up best to get a heating engineer out to test

 

[Sarah80]

I would say pcb or a sensor as the boiler should fire up best to get a heating engineer out to test

Had two heating engineers out and they can’t pinpoint it! BUT, although its had a flush the pump wasn’t running so I think maybe put the x800 in whilst the pump is running on mains. Would you try that first? It’s had a new water flow sensor.

 

[ShaunCorbs]

Had two heating engineers out and they can’t pinpoint it! BUT, although its had a flush the pump wasn’t running so I think maybe put the x800 in whilst the pump is running on mains. Would you try that first? It’s had a new water flow sensor.

They haven’t done a flush then