- Joined
- 31 Mar 2012
- Messages
- 56
- Reaction score
- 3
- Country
Suddenly lost hot water (Boiler + Hot water tank) - a few days ago it wasn't as hot as we expected so I thought the thermostatic valve in the however this time check a normal tap and nothing.
Turning CH on, boiler runs, pump runs, valve to CH opens, can feel the pipes get hot.
Turning HW on, boiler doesn't start, pump doesn't run, valve to HW doesn't open.
Manually opening HW valve doesn't help since pump isn't running (pump is connected to the boiler, not the honeywell controller).
Next step check the thermostat on the hot water tank - I can hear it click round the 10c mark to show its trying to activate. Check the contacts and I can get continuity (and not) if I turn the dial above and below the current temp - I think this is working okay.
Check the continuity to the Honeywell terminal junction box (to the tank's thermostat) and this is okay.
It's a run of the mill Honeywell ST9400C. The relay for CH and HW both click as I would expect.
I'm guessing the issue is with the timer still?
Turning CH on, boiler runs, pump runs, valve to CH opens, can feel the pipes get hot.
Turning HW on, boiler doesn't start, pump doesn't run, valve to HW doesn't open.
Manually opening HW valve doesn't help since pump isn't running (pump is connected to the boiler, not the honeywell controller).
Next step check the thermostat on the hot water tank - I can hear it click round the 10c mark to show its trying to activate. Check the contacts and I can get continuity (and not) if I turn the dial above and below the current temp - I think this is working okay.
Check the continuity to the Honeywell terminal junction box (to the tank's thermostat) and this is okay.
It's a run of the mill Honeywell ST9400C. The relay for CH and HW both click as I would expect.
I'm guessing the issue is with the timer still?