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Replies: 25
Views: 9,261
Posted By drooplug

You will need a volt meter to check what is going...

You will need a volt meter to check what is going on here. When your thermostat makes a call for heat, it sends voltage to the zone valve. The zone valve opens and activates the end switch and that...
Replies: 25
Views: 9,261
Posted By drooplug

Do you have any zone valves? A voltage meter...

Do you have any zone valves?

A voltage meter would be very helpful in tracking down the problem.
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