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  1. J

    CH only works when HW is on

    I fitted the new actuator (Myson ACT322) last night. 10 minute job - CH and HW now working correctly. Thanks :D
  2. J

    CH only works when HW is on

    Thanks for all the replys. New actuator on order - £39. Cheers, James
  3. J

    CH only works when HW is on

    Mandate. I took off the valve head and tried what you suggested. When I turned down the cylinder stat the quadrant didn't move, but stayed in the mid position. Also if I turned off the HW from the programmer, the HW LED went out on top of the valve, but again the quadrant didn't move. I...
  4. J

    CH only works when HW is on

    Homer, I've just tried pulling the manual override switch. The HW LED goes out whilst I'm holding the switch, but as soon as I release it it comes back on again. So I'm stuck with both CH and HW LED's on. The valve is a Potterton MSV322. I guess this meens it needs replacing? Anyone...
  5. J

    CH only works when HW is on

    David, Thanks for your reply. I may not have been using the correct terminology when I stated this was a gravity fed system. I know its not a combi boiler and I have a hot water tank that is fed via gravity from a cold water tank in the loft. If my 3 port valve was stuck in the HW & CH...
  6. J

    CH only works when HW is on

    Hi, Can someone please help me diagnose the following fault. When my CH and HW both come on in the evening, my water and radiators heat up OK. However as soon the HW tank stat reaches temperature and stops demanding HW, my CH also stops. The CH will stay off regardless of the position of...
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