Possibly a dumbass question which reveals an almighty cock up but here goes . . any advice much appreciated.
<y parents have a Potterton 10/16 boiler with hw cylinder in the loft.
No room stat connected.
An old 2 way zone valve was stuck open as they could never get hot water only.
Other than this the system appeared to be fine.
A couple of thermostatic valves on the downstairs rads started to leak so I drained down the system and changedthem.
At the same time I replaced the old 2 way zone valve, a 20+ year old ACL672ABL1. The new one is a Honeywell V4043.
I haven't wired up the new zone valve as not sure of the connections (waiting on an electrician friend to spare me 30 mins).
As the Honeywell defaults to closed I assumed that if I left the valve on manual both HW and CH would be on all the time (acceptable for a week or so until said mate gets some time).
After I refilled the system the heating worked fine but there was no flow to the hw cylinder. I opened the flow & return to the coil to release any air which may have been trapped.
My father has since discovered that if he puts the zone valve to Auto the hw heats up. On Manual, only ch works. There is no water hammer or knocking pipes whichever position the valve is in.
The old zone valve had no markings on it showing flow direction. The new one did so I fit it with the Auto/Manual switch at the top (same as the ACL one).
Before I drain down and swap over, would a zone valve fitted the wrong way around cause only hw or ch to work when left on manual ? or is something entirely unrelated likely to be the problem.
Thanks very much
<y parents have a Potterton 10/16 boiler with hw cylinder in the loft.
No room stat connected.
An old 2 way zone valve was stuck open as they could never get hot water only.
Other than this the system appeared to be fine.
A couple of thermostatic valves on the downstairs rads started to leak so I drained down the system and changedthem.
At the same time I replaced the old 2 way zone valve, a 20+ year old ACL672ABL1. The new one is a Honeywell V4043.
I haven't wired up the new zone valve as not sure of the connections (waiting on an electrician friend to spare me 30 mins).
As the Honeywell defaults to closed I assumed that if I left the valve on manual both HW and CH would be on all the time (acceptable for a week or so until said mate gets some time).
After I refilled the system the heating worked fine but there was no flow to the hw cylinder. I opened the flow & return to the coil to release any air which may have been trapped.
My father has since discovered that if he puts the zone valve to Auto the hw heats up. On Manual, only ch works. There is no water hammer or knocking pipes whichever position the valve is in.
The old zone valve had no markings on it showing flow direction. The new one did so I fit it with the Auto/Manual switch at the top (same as the ACL one).
Before I drain down and swap over, would a zone valve fitted the wrong way around cause only hw or ch to work when left on manual ? or is something entirely unrelated likely to be the problem.
Thanks very much