I have a Grundfos UPM3 Flex AS pump for my UFH system.
The lights on it are as follows:
LED 1: Flashing green maybe every second
LED 2: off
LED 3: Solid yellow
LED 4: Solid yellow
LED 5: off
I understand the yellow LED's indicate the speed/performance setting it is set to and I can change this by pressing the button on the pump. So it is currently set to medium performance.
What I don't understand is the flashing green LED, I believe this should be solid according to the manual.
Page 2 says the following:
Operation status
– When the operation mode is active, all active LEDs are constantly on in order to differentiate this mode from the select setting mode.
– If the circulator is stopped by an external signal, LED 1 flashes green.
So my understanding of this is that the circulator is stopped in the pump by some external signal.
But what does this actually mean? The floor does heat up but it's not brilliant, the zones were never balanced when it was installed and I wouldn't be surprised if it needs bleeding as well to remove air.
Surely if the circulator is stopped I wouldn't hear the pump running and the floor wouldn't warm up unless my understanding of what a circulator does is wrong.
Next I am unsure what it really means by some external signal. What sort of external signal could be communicating with the pump to stop the circulator and why?
We have a Heatmiser Underfloor Heating Wiring Centre, Heatmiser stats in each room/zone and a Vaillant ecoTec boiler.
The pump LED has been flashing green since we moved in and this property is a new build. I don't have much confidence in the plumbers or electricians that the developer has used and I doubt they will have any clue on this based on my experience with them so far.
Any insight or advice would be greatly appreciated.
The lights on it are as follows:
LED 1: Flashing green maybe every second
LED 2: off
LED 3: Solid yellow
LED 4: Solid yellow
LED 5: off
I understand the yellow LED's indicate the speed/performance setting it is set to and I can change this by pressing the button on the pump. So it is currently set to medium performance.
What I don't understand is the flashing green LED, I believe this should be solid according to the manual.
Page 2 says the following:
Operation status
– When the operation mode is active, all active LEDs are constantly on in order to differentiate this mode from the select setting mode.
– If the circulator is stopped by an external signal, LED 1 flashes green.
So my understanding of this is that the circulator is stopped in the pump by some external signal.
But what does this actually mean? The floor does heat up but it's not brilliant, the zones were never balanced when it was installed and I wouldn't be surprised if it needs bleeding as well to remove air.
Surely if the circulator is stopped I wouldn't hear the pump running and the floor wouldn't warm up unless my understanding of what a circulator does is wrong.
Next I am unsure what it really means by some external signal. What sort of external signal could be communicating with the pump to stop the circulator and why?
We have a Heatmiser Underfloor Heating Wiring Centre, Heatmiser stats in each room/zone and a Vaillant ecoTec boiler.
The pump LED has been flashing green since we moved in and this property is a new build. I don't have much confidence in the plumbers or electricians that the developer has used and I doubt they will have any clue on this based on my experience with them so far.
Any insight or advice would be greatly appreciated.
