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Discuss Intermittent heat to central heating in the Central Heating Forum area at Plumbers Forums

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F

ftrilby

Hi everybody, before I posted I have checked to see if anyone else has similar issues to what I am experiencing and although some are very close nothing matches. I am not a DI, plumberY BOD, so bare with my rough terminology but would really appreciate any advice you may have. I am just running through the scenario that I experience each day, its a bit descriptive but hopefully it paints a picture of what I do each day!


Each morning I go to airing cupboard turn the CH on (siemens control panel), go downstairs and turn the thermostat up, can see the boiler (BAXI discontinued model) in the kitchen firing up and minutes later the radiators are warming up no problem. When the house is warm enough I turn down the thermostat but leave the CH on.


Later that day the house is cold, I turn the thermostat up but the radiators are not warm, there is hot water but nothing to the radiators. The only way I manage to get the radiator working again is to go to the airing cupboard and turn off the main switch which powers off the control panel and the (ground fos) pump. I can see the lever on the drayton motorised valve go to the right( default position) . I can also freely move it to the left where the catch is and it does reset back so the spring is working. I turn the main switch on and can see the lever move all the way to the left and then the radiators are warming up. I have tried turing the CH off after the house has warmed up and then turn that on when I need the heat and that worked a couple of times but not as consistently as turning the whole system off/on again.


Now from further reading I have done, I am guessing when I turn the thermostat on, a message should be sent to the valve to divert the water to the radiators but also the boiler should fire up. When it the radiators are not warming up but the thermostat is on, the lever on the valve is in the middle but it feels loose if that makes sense.


I don't have much history of the CH setup as I have only been in the house for a month.


Any advice on where I can look or if I am doing something wrong much appreciated.


Ta
 
Could be a number of things on the control system wiring and components. Requires electrical testing of the programmer, thermostat, zone valve, and interlocks, to identify what the problem is.
 
How many motorized valves do you have and which type?

(These may not be identical to yours. Its the number of pipe connections, 2 or 3, which is important)

2 port valve.jpg3 port valve.jpg
 
Last edited:
Sounds like a faulty microswitch. Needs testing so you will need to get an engineer in.
 
Sounds like a faulty microswitch. Needs testing so you will need to get an engineer in.

I googled what you mentioned and I do not know what or were this micro switch? Please advice further!
 
Later that day the house is cold, I turn the thermostat up but the radiators are not warm, there is hot water but nothing to the radiators.
When this happens, is HW On or Off at the programmer?

If ON,

Do the rads heat up if you turn the cylinder stat (on side of HW cylinder) up?
Do they heat up if you turn the cylinder stat down?
 
every morning, you wake up to a cold house. Then have to go to the cylinder cupboard to turn the heating on. Wait till house gets warm, then turn heating off but leave boiler on. Later in the day, you attempt to turn the heating on again but get no heating as radiators ''refuse'' to heat up.

That is a lot of uneccesary back and forth movement. Why not have the whole set-up properly wired and programmed so heating and hot water comes on when needed? Saves you waking up to a cold house. Heating should come on 20-30 mins b4 you wake up to a nice warm and toasty house
 
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