I'm helping out with a heating system which hasn't been used for a while (empty properrty). Hot water works, but no Central Heating. The system is Y plan with timer controlling both HW and CH and stats controlling HW and CH independently. I changed the circulating pump (original leaking and corroded replaced with Grundfos 15/50), still no CH. I changed the 3 way valve (original having no manual over-ride capability with Honeywell V4073A). I now have:
HW when called for,
CH when called for as long as HW is also called for,
No CH when HW not called for.
When the valve should divert to CH only I get a ticking (sound like microswitches being activated/de-activated) and no sign of the circulating pump or boiler turning on. I am able to select CH using the manual setting on the valve.
Could there be a fault with the new 3 way valve, or is there a chance that the wiring was not connected correctly (I have connected like - for - like)?
HW when called for,
CH when called for as long as HW is also called for,
No CH when HW not called for.
When the valve should divert to CH only I get a ticking (sound like microswitches being activated/de-activated) and no sign of the circulating pump or boiler turning on. I am able to select CH using the manual setting on the valve.
Could there be a fault with the new 3 way valve, or is there a chance that the wiring was not connected correctly (I have connected like - for - like)?