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

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Furnace wont start when thermostat sends signal

I have an Beckett oil furnace and a digital thermostat. When the temp in the house drops below the temp set on thermostat, the thermostat send a signal to the furnace but the furnace does not start. When I press the restart button on the furnace it starts, heats the home to the set temp and then shuts down but it won't restart once the temp in the house drops again. What could be the problem?

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  • Anonymous Jan 31, 2009

    Same problem--any ideas?

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Bad primary control (the box with the reset button), maybe your thermostat but unlikely. Try the Primary Control first. How old is your burner?

Posted on Dec 14, 2012

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By restart button you mean reset i believe,its located on top of oil burner and says only push one time .if thats the button your pushing it is the reset button or retry for oil burner if you are pushing this there is a problem with burner

Posted on Feb 05, 2009

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You will likely need to install an isolation relay in the W circuit from the thermostat. Some thermostats rob a small current through the W circuit to power the thermostat. This small current can be enough to start the fan circuit timer. You can test this by disconnecting W at the furnace and allowing the timer to shut down. If the fan shuts off with the W disconnected you can install a simple relay.

The relay coil will be connected to Common on one side and the W from the thermostat to the other. Then you will run a wire from R on the furnace to the relay and from the N.O. Contacts to the W terminal on the furnace. This will kill that signal that is starting the timer and the W can steal it's power through the coil back to common.


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The Thermostat Wizard is an interactive tool that will guide you through wiring and troubleshooting your thermostat, as well as programming it to the most comfortable settings for you and your family. Simply answer the questions from the Thermostat Wizard to correctly connect, troubleshoot and/or program your Honeywell Thermostat. You can even print the instructions and bring them right to the thermostat to help make things easier.
Go to: http://yourhome.honeywell.com/Consumer/Cultures/en-US/Support/Thermostat+Wizard/

However - the problem is probably not with your thermostat but with your furnace. It is most likely a dirty flame sensor - a maintenance issue. If you have not had your furnace serviced recently (more than 1 year) that is where you should start. Modern furnaces require regular maintenance.


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