I'm puzzled about the correct operation of this flow switch (the one which controls the fan, mounted on the heating manifold).
With everything off, the plunger is out [Seems correct]
In CH mode, the plunger retracts when the pump is running, which I think is correct. [The CH seems to function ok.]
In DHW mode, the plunger doesn't retract when the pump runs. Is this correct? [Burner doesn't light in DHW mode.]
With everything off, the plunger is out [Seems correct]
In CH mode, the plunger retracts when the pump is running, which I think is correct. [The CH seems to function ok.]
In DHW mode, the plunger doesn't retract when the pump runs. Is this correct? [Burner doesn't light in DHW mode.]