The thermostat is basically a switch; turning it to max (or moving the yellow wire to L) keeps the switch closed.
The switch needs to be kept closed, or the Wiser couldn't send it's own call for heat along the wire.
Boiler control change.
- Thread starter koontz
- Start date
The switch needs to be kept closed, or the Wiser couldn't send it's own call for heat along the wire.
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I understand, many thanks for the help.
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