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- 15 Feb 2007
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I have an interesting fault on my Danfoss mid-position 3 port valve.
If the valve starts unactivated (DHW position) and there's a call for CH only, then it works every time. So the actuator moves through its full extent and both internal switches work faultlessly.
But if the valve starts from its mid-position (DHW and CH both called for) and the call changes to CH only, then sometimes a fault occurs. The actuator doesn't fire up the boiler.
I have tested the electrical output when the fault occurs and the orange wire is not signalling the boiler to come 'on'. So the second internal switch in the actuator cannot be switching properly. I can 'overcome' the fault by tapping the actuator sharply with my finger tips. This must jog the motor and make the second switch work!
Have other people experienced this problem where the mid-position valve fires up the boiler most times when only CH is called for, but not always because the second internal switch doesn't work occasionally?
If the valve starts unactivated (DHW position) and there's a call for CH only, then it works every time. So the actuator moves through its full extent and both internal switches work faultlessly.
But if the valve starts from its mid-position (DHW and CH both called for) and the call changes to CH only, then sometimes a fault occurs. The actuator doesn't fire up the boiler.
I have tested the electrical output when the fault occurs and the orange wire is not signalling the boiler to come 'on'. So the second internal switch in the actuator cannot be switching properly. I can 'overcome' the fault by tapping the actuator sharply with my finger tips. This must jog the motor and make the second switch work!
Have other people experienced this problem where the mid-position valve fires up the boiler most times when only CH is called for, but not always because the second internal switch doesn't work occasionally?