Ask Me Help Desk - Thermostat turns on air handler but not boiler. Other zone work fine.

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- - Thermostat turns on air handler but not boiler. Other zone work fine. (https://www.askmehelpdesk.com/showthread.php?t=776447)

Thermostat turns on air handler but not boiler. Other zone work fine.

This one zone thermostat will not turn the boiler on. Hot air seems to flow if other zones have turned on the boiler. Two zones work, one does not.

What should I look at to troubleshoot this issue?

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