Question about Honeywell Electronic Programmable Heat/Cool Thermostat - CT3300A100 Heater

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Honeywell electronic thermostat malfunction for oil heat zone

We have a Honeywell electronic thermostat, in fact 3 in our home as we have 3 heating (oil) zones with forced hot water. They have all worked fine until tonight. One of the thermostats is consistently resetting to 75 degrees regardless of us "holding" it or programming it for a lower setting. Any ideas?

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Try changing the batteries.

Posted on Mar 04, 2008

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