Question about Honeywell Electronic Programmable Heat/Cool Thermostat - CT3300A100 Heater
I assume this is a boiler system as it runs the domestic hot water as well as the heat. Check the boiler to see if it is lite or lighting on a call for heat. If it is a standing pilot system and the pilot is not lite light the pilot and hold the button on for 60 seconds if the pilot doesn't stay lite after light and timing out you will have to replace the thermocuple to get the pilot to stay lite.
Posted on Feb 06, 2010
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Posted on Jan 02, 2017
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