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Hi. Been trawling through lots of threads but couldn't find anything specifically aligned to my 'problem', as follows:
I had an Ideal Logic 24Kw system boiler installed in late August, all was well until around end of November when I started to notice that the boiler fired up and ran regularly whilst the programme timer was OFF. I put this down to frost protection as temperatures were very low however this has continued since the milder weather and so I have been doing some investigations in the loft. Here's as much info as I can think of:
S Plan layout
2 x Drayton ZA5 motorised valves
Ancient Potterton timer clock
Wiring is an absolute dogs dinner!!
When the programme timer is ON for either or both CH & HW then all works fine, rads are hot, water is hot. M/Valves both move to open position (B).
When programme timer is OFF no heat to rads or tank (pressurised) BUT pump runs and boiler ignites.
M/Valve for HW seems to function as expected i.e. opens when calling for HW and closing when full of HW and thermostat kicks in.
M/Valve for CH also seems to function as expected based i.e. opens when calling for CH and closing when room stat reaches temperature.
I have been able to remove the actuator from the HW motorised valve, valve moves freely around 20 degrees
I cannot release the actuator from the CH motorised valve (Guessing this could be the obvious fault??) - can't test valve for movement
What's concerning me is if I get a replacement valve/actuator fitted am I barking up the right tree - operationally the CH valve appears to functionally do what it's supposed to as in it opens and closes based on programme timer and thermostat.
Is it still possible to have a faulty actuator or micro switch but still have the functionality above?
Many thanks
I had an Ideal Logic 24Kw system boiler installed in late August, all was well until around end of November when I started to notice that the boiler fired up and ran regularly whilst the programme timer was OFF. I put this down to frost protection as temperatures were very low however this has continued since the milder weather and so I have been doing some investigations in the loft. Here's as much info as I can think of:
S Plan layout
2 x Drayton ZA5 motorised valves
Ancient Potterton timer clock
Wiring is an absolute dogs dinner!!
When the programme timer is ON for either or both CH & HW then all works fine, rads are hot, water is hot. M/Valves both move to open position (B).
When programme timer is OFF no heat to rads or tank (pressurised) BUT pump runs and boiler ignites.
M/Valve for HW seems to function as expected i.e. opens when calling for HW and closing when full of HW and thermostat kicks in.
M/Valve for CH also seems to function as expected based i.e. opens when calling for CH and closing when room stat reaches temperature.
I have been able to remove the actuator from the HW motorised valve, valve moves freely around 20 degrees
I cannot release the actuator from the CH motorised valve (Guessing this could be the obvious fault??) - can't test valve for movement
What's concerning me is if I get a replacement valve/actuator fitted am I barking up the right tree - operationally the CH valve appears to functionally do what it's supposed to as in it opens and closes based on programme timer and thermostat.
Is it still possible to have a faulty actuator or micro switch but still have the functionality above?
Many thanks
