Boiler help Potterton Osprey

[sparks55]

Potterton osprey fires up when programmer switched off and both stats isolated
It's running through a Honeywell sundial wiring centre
Can only turn off using mains switch

 

[snowhead]

Frost stat?

 

[Pete999]

Potterton osprey fires up when programmer switched off and both stats isolated
It's running through a Honeywell sundial wiring centre
Can only turn off using mains switch

Talk to "solar savings" he seems to know what he is on about with boilers, as well as other things of course, best be careful what I say my posts can sometimes be taken the wrong way.

 

[Leesparkykent]

Probably a stuck microswitch on one of the valves. Is it an S-plan? Easy to confirm...with programmer off for both heating and hot water there should be no voltage on the brown of each valve. With no voltage on the brown there should be no voltage on the oranges of the valves if there is voltage on the oranges then one of the micro switches is stuck between grey permanent live and the orange. Isolate the supply, disconnect the oranges, make them safe for testing, turn supply on and see what orange is live this is the one with the stuck microswitch. Most valves you can buy a replacement head for and wire it back in like for like.

 

[sparks55]

Probably a stuck microswitch on one of the valves. Is it an S-plan? Easy to confirm...with programmer off for both heating and hot water there should be no voltage on the brown of each valve. With no voltage on the brown there should be no voltage on the oranges of the valves if there is voltage on the oranges then one of the micro switches is stuck between grey permanent live and the orange. Isolate the supply, disconnect the oranges, make them safe for testing, turn supply on and see what orange is live this is the one with the stuck microswitch. Most valves you can buy a replacement head for and wire it back in like for like.

Tried that Lee with everything disconnected apart from the programmer and the boiler it still fired up
Spoke again to the custom seems that someone came to look at the boiler because it wouldn't fire up he fitted a new part then seems that cured the fault but has caused a new one
Told the customer they better get him back to sort it

 

[Leesparkykent]

Tried that Lee with everything disconnected apart from the programmer and the boiler it still fired up
Spoke again to the custom seems that someone came to look at the boiler because it wouldn't fire up he fitted a new part then seems that cured the fault but has caused a new one
Told the customer they better get him back to sort it

Yeah def the best option