Central heating failed need help

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The actuator heads are easy to replace. You don't even need to mess around it the terminal box if you do what I did. Mount a standand switch patress on wall.Cut existing flexible cable and connect to new cable using choc block, within the patress and fit blanking plate.
Do make sure all power is off, With HW off and CH off the grey is still live (HW OFF wire)

Can't understand how you have 2 'lives'
:rolleyes: :rolleyes:
 
Stripped off the top of the valve and the circuit board is black and burnt
 
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Can anyone recommend new 3 port valve to replace Lifestyle 679H340-3OLO, circuits are burnt out although valve seems to move quite good. Prefer easiest to fix. Thanks! Mick
 

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