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Tony - I don't believe the pump is wired back to the boiler. The service manual for the boiler says "The Pump over-run time switch is not applicable to this boiler" so I guess it doesn't need overrun. Mandate - from what you are saying it sounds like the cut over to CH only is happening as...

Tony - I don't believe the pump is wired back to the boiler. The service manual for the boiler says "The Pump over-run time switch is not applicable to this boiler" so I guess it doesn't need overrun. Mandate - from what you are saying it sounds like the cut over to CH only is happening as...

An update on the piping problem - our plumber has looked at this and agreed that the return from the CH circuit had been connected in to the flow from the boiler. It was a fairly easy fix to hop this over, to connect into the return from the HW cylinder coil where it should be. I'm stumped as...

@mandate – thanks for the info on how the 3 port valve works. I’m going down the track of a pipe work problem so wanted to take wiring out of the troubleshooting as far as possible. What I did was remove the 3 port valve motor head and manually moved the valve spindle over to CH only. This...

We have a Buderus 600 boiler on a y-plan system which replaced the original 1980s boiler. Since it was installed it would only operate on either HW only or CH+HW. If we switched it to CH only then the boiler came up with an error code indicating a circulation problem. I’ve spoken to a...