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Old 10-15-2010, 07:35 PM   #16
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Only 1 thermostat triggers boiler...


With zone 4 turned down so it isn't running the circ.

Turn up the stat of one of the zones that doesn't run the circ. Go to that zone valve. Tie the 2 red wires together. If the circ runs then. Its the micro switch.

If the circ doesn't run. Then it is something else.

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Old 10-15-2010, 11:57 PM   #17
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Only 1 thermostat triggers boiler...


Will try that in the am, off to work again.
Thanks, Bill
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Old 10-17-2010, 03:55 PM   #18
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Only 1 thermostat triggers boiler...


Joining the reds on zone 3 without zone 4 calling for heat worked. Did not try 2 and 1 so I will assume all 3 need new end switches. I am thinking they can't cost much. Still wondering about the dim light on the control board for zone 4 when he needs heat, but if all works I may forget about it.
Thanks, Bill

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