G
gazz27
I am having a problem with the boiler when after running for approx 45mins and the house is approaching temperature that the boler will start cycling (switching off and then back on again after approx 1 min)
I have detailed what is happening and used the Valliant codes. I have a weather compensator fitted as well.
Valliant codes
d0 = range rated setting
d41= return temp
d40= feed temp
When the system is cold, the system fires up, runs at a high setting (I assume d0 related) and brings the flow d40 (feed) up to flow temp target.
At this time d41 (return) will be some way behind d40 approx 20c below.
As d40 is now at target temp the boiler modulates down to maintain d40 at target temp but at the same time d41 is slowly increasingp. As d41 increase the heat requied to maintain d40 falls so the system continues to modulate down.
Now my problem!!!!
As d41 (return) increases, d40 continues to rise unless the system can modulate down to a lower enough output to stop this. My problem appears that it cannot modulate low enough so the system shuts down.
Temp then falls rapidly and about 1-2 mins later system refires at highish output and quickly exceeds target temp and the system gets into a cycle.
I have raised minimum temp (50c) which helps a bit and lowered d0 which helps a bit. I can force it out of the cycles by temporally raising min temp.
Is there anything else I can do. (ecoTEC 418)
Gary
I have detailed what is happening and used the Valliant codes. I have a weather compensator fitted as well.
Valliant codes
d0 = range rated setting
d41= return temp
d40= feed temp
When the system is cold, the system fires up, runs at a high setting (I assume d0 related) and brings the flow d40 (feed) up to flow temp target.
At this time d41 (return) will be some way behind d40 approx 20c below.
As d40 is now at target temp the boiler modulates down to maintain d40 at target temp but at the same time d41 is slowly increasingp. As d41 increase the heat requied to maintain d40 falls so the system continues to modulate down.
Now my problem!!!!
As d41 (return) increases, d40 continues to rise unless the system can modulate down to a lower enough output to stop this. My problem appears that it cannot modulate low enough so the system shuts down.
Temp then falls rapidly and about 1-2 mins later system refires at highish output and quickly exceeds target temp and the system gets into a cycle.
I have raised minimum temp (50c) which helps a bit and lowered d0 which helps a bit. I can force it out of the cycles by temporally raising min temp.
Is there anything else I can do. (ecoTEC 418)
Gary
