Question about Honeywell Programmable Thermostat Heater

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Replacing Honeywell heating progrmmer

Hi I have a Honeywell ST699 programmer and would like to upgarde to an ST6400c. How difficult will this be, is the wiring common?

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  • AllanJ Jan 12, 2009

    I've got a problem too with the ST699. However I can't see how to either get it off the wall or unscrew the front. Any ideas please?

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Yep the wires will hook up to the same designations, just write down what color was connected where. You will need to set the thermostat up for your particular situation...gas, electric, heat pump, ect. The installation maunel is very clear on this aspect so you should not have a problem.

Posted on Nov 14, 2008

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For AlanJ the Honeywell ST699 front plate pulls out of the rear mounting box - you can help it (having isolated power obviously) and sliding a blunt knife or similarly thin tool into the rear box along the top surface. There are 3 tabs that hold the two plastic halves together, two on the top surface and one on the bottom left. The blade helps the tabs disengage. Rgds Nick

Posted on Oct 07, 2009

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Posted on Jan 02, 2017

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