Worcester Heatslave 2 , 12-18kw (Combi). Pump does not run on CH

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Hi,
Trying to work out why the circulator pump does not work on CH mode. It works ok on DHW mode but won't go whilst the boiler is on Central Heating. There are 4 separate relays on the board which complicate things greatly, can these be changed or could it be something else?
Remember the burner WORKS in CH mode but pump does not?
*Sorry it was Heatslave 1*
 
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Greenstar ??

I will assume it is.
Is divertor motoring to heating?
Is there voltage on end switch grey wire?
 
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Greenstar ??

I will assume it is.
Is divertor motoring to heating?
Is there voltage on end switch grey wire?
There are so many relays for the power to run through I am getting confused. Not tested all valve terminals, but seem to have live brown and live orange out . A hot wire will run the pump and rads will heat up, so valve must have opened for the heating.
 
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Check motorised valve switch as my previous post!
Brown opens valve
Orange is live.
Grey is switched live!
 
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If valve is opening and no voltage on grey.......then yes!! Part no 87161087230

You can feel the valve opening and closing on the lever underneath.
Drayton actuators often snap bits of plastic inside.
 
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So how do you get the microswitch operation? One live for opening valve and one through microswitch for boiler/ pump operation?.
The brown opens the valve which operates the internal switch and powers the pump.
 

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