I have a Danfoss TP9000 heating & hot water controller which is behaving oddly, I'm hoping someone here can tell me whether it's faulty or not.
When the heating is set to come on according to the timer, the controller does what it should and activates the boiler. The house warms up to the target temperature, and then the controller shuts the boiler down again. All good so far. But then roughly every two to seven minutes, while the house is at the right temperature, the controller will switch the boiler on again for about ten seconds, just long enough for the boiler to fire up, then shut it off. All the while, the room temperature is the same as the target temperature, so I don't think there should be any need for the controller to be calling for heat. To my mind it's just wasting gas and putting the boiler through unnecessary ignition cycles, but I'm not a professional and I've never had this kind of controller before, so maybe it's a feature.
I've taken a video of it, which is here: https://drive.google.com/open?id=1--n_vkLVe6qBH1VjZ9mwFD3p1LhiXMqX
There's a whole lot of nothing happening at the start of the video but if you scroll forward to about 04:45, you'll see the following:
Throughout: target temperature (small number) is the same as actual temperature (big number), so as far as I can tell there should be no need for the controller to call for heat.
04:53: Controller calls for heat
05:20: Boiler can be heard firing up
05:24: Controller shuts the boiler off
It'll carry on doing this every few minutes for the whole time that the heating is set to be on.
The house was built in 2011 and the heating system is original to the house. The boiler is a Potterton Promax 15 SL and the room temperature sensor is a Danfoss TS2.
Any advice gratefully received.
When the heating is set to come on according to the timer, the controller does what it should and activates the boiler. The house warms up to the target temperature, and then the controller shuts the boiler down again. All good so far. But then roughly every two to seven minutes, while the house is at the right temperature, the controller will switch the boiler on again for about ten seconds, just long enough for the boiler to fire up, then shut it off. All the while, the room temperature is the same as the target temperature, so I don't think there should be any need for the controller to be calling for heat. To my mind it's just wasting gas and putting the boiler through unnecessary ignition cycles, but I'm not a professional and I've never had this kind of controller before, so maybe it's a feature.
I've taken a video of it, which is here: https://drive.google.com/open?id=1--n_vkLVe6qBH1VjZ9mwFD3p1LhiXMqX
There's a whole lot of nothing happening at the start of the video but if you scroll forward to about 04:45, you'll see the following:
Throughout: target temperature (small number) is the same as actual temperature (big number), so as far as I can tell there should be no need for the controller to call for heat.
04:53: Controller calls for heat
05:20: Boiler can be heard firing up
05:24: Controller shuts the boiler off
It'll carry on doing this every few minutes for the whole time that the heating is set to be on.
The house was built in 2011 and the heating system is original to the house. The boiler is a Potterton Promax 15 SL and the room temperature sensor is a Danfoss TS2.
Any advice gratefully received.