worcester danesmoor, 20/25 heatslave

[headscratcher1]

hi there,
I have a problem with the above oil combi,
when in c/h mode the burner will fire up & it will run to o/heat, -the pump is not starting !
the boiler operates fine in h/w mode,
I suspect that the honeywell v4044 actuator is at fault,
any ideas ???

 

[cider]

I suspect that the honeywell v4044 actuator is at fault,

 

[wilhelm]

if the boiler is firing, then the mo valve is working.
but, of course there is the pcb and relays ...and that wiring diagram they provide in the manual........does me head in.

Anyway ,strange as it may seem, last heatslave I did with this problem , I changed the pump.
mainly cos i couldnt face changing the pcb.

try changing the pump speed selector when you have ch selected, does it come on intermittently?

fekkin heatslaves..

 

[gasandoilman]

pcb

 

[oilman]

How do yopu know the pump doesn't start in CH mode? It is the same pump taht works in HW mode. Have you bled the air from the three boiler bleed points?

 

[headscratcher1]

if the boiler is firing, then the mo valve is working.
but, of course there is the pcb and relays ...and that wiring diagram they provide in the manual........does me head in.

Anyway ,strange as it may seem, last heatslave I did with this problem , I changed the pump.
mainly cos i couldnt face changing the pcb.

try changing the pump speed selector when you have ch selected, does it come on intermittently?

fekkin heatslaves..

i thought mo valve is only operated when c/h is called for as it only powers open then, also no 240v when in h/w imode ?
pump has been changed but prob still exists,
as for wiring diagram

 

[headscratcher1]

How do yopu know the pump doesn't start in CH mode? It is the same pump taht works in HW mode. Have you bled the air from the three boiler bleed points?

pump don't get 240v,
only 1 pump, system fully bled & pressured correctly

 

[cider]

endswitch in valve feeds pump when in ch mode only

 

[headscratcher1]

pcb

hope not as this seems to be the more expensive option,
but i could be persuaded.
have you come across thi prob before ???

 

[headscratcher1]

endswitch in valve feeds pump when in ch mode only

what feeds 240v to pump when in h/w mode ??

 

[cider]

the hw stat via board

 

[headscratcher1]

the hw stat via board

you've convinced me
I'll get a new powerhead & see how it goes.
watch this space for any updates.