Hi All,
I have problem with my heating system. I have Vaillant ecoTEC plus 415 boiler which is connected to Drayton LP822 programmer.
The problem is; boiler is not firing for central heating only. If I want cental heating to turn on, I need to turn the hot water on as well. Hot water only is Ok. Hot water and central heating together is ok as well but central heating only is not working. Our room thermostat and motorized valve has been replaced recently, so I guess they should be fine. When I change the program via Drayton programmer, I see that motorized valve is moving to all three positions without any problem. When I turn on the central heating when hot water is turned off, motorized valve moves to correct position but boiler does not fire up. I played with room thermostat, it clicks but no reaction from the boiler again.
To sum up, hot water is working like a prerequisite for the central heating. Central heating is not working without hot water.
Can you please advise what the problem may be?
I have problem with my heating system. I have Vaillant ecoTEC plus 415 boiler which is connected to Drayton LP822 programmer.
The problem is; boiler is not firing for central heating only. If I want cental heating to turn on, I need to turn the hot water on as well. Hot water only is Ok. Hot water and central heating together is ok as well but central heating only is not working. Our room thermostat and motorized valve has been replaced recently, so I guess they should be fine. When I change the program via Drayton programmer, I see that motorized valve is moving to all three positions without any problem. When I turn on the central heating when hot water is turned off, motorized valve moves to correct position but boiler does not fire up. I played with room thermostat, it clicks but no reaction from the boiler again.
To sum up, hot water is working like a prerequisite for the central heating. Central heating is not working without hot water.
Can you please advise what the problem may be?