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

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I have a vison pro th8320u cant get aux heat to work

Vison pro th8320u

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Http://customer.honeywell.com/techlit/pdf/69-0000s/69-1871.pdf take and click on this link, then go to the installers menu and on option 0170 that is where you have to program the thermoistat to have aux heat. good luck

Posted on Jan 25, 2009

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The system type has been incorrectly set during the installer setup. The t/stat thinks there is auxiliary heat equipment that is controlled by a signal on the Aux-E terminal which you obviously don't have. My recommendation would be to go to the Honeywell website and download a copy of the installation guide for the FocusPro 8000 and go through the installer setup again but select the appropriate system type under setup function 1.

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If the thermostat is not over shooting the temperature than don't worry about it.
These thermostats are very sensitive and will turn the heat back on even before the degrees drop on the display. Often they will shut down before the display changes also. You can change the sensitivity of the thermpstat if you read the directions and change the cycles per hour to a less number. There is an installers program in there that you need to push a combiunation of buttons to get too. The instructions tell you how to do that also.

Hopefully you did not throw away the instruction manual for your t-stat.. :-)

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Thermostat show AUX HEAT


A heatpump has two sources of heat. One is when the heatpump is operating in normal heat mode, and the other is typically electric heat strips.

The strips come on when the unit is going into defrost, when the unit is not able to keep up with the demand for heat (really cold temps) and when the unit is not working properly.

Whne the strips are on, the T-stat displays "aux-heat" to indicate the strips are in operation.

If the strips are working properly you should have warmer air than with the HP alone. Try switchin it from "heat" to "emergency heat" and see what it will do.

When the HP is not able to keep up with the demand for heat then the heat strips come on, but they typically come on only when the room temp has gotten well below the thermostat setting.

In that situation it would be normal to see indoor temps at 63 degrees when the T-stat is set on 70.

But when you set it to E-heat it bypasses the heatpump operation and goes directly to the heat strips. If they are working properly it should maintain an accurate temp in the home.

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i have a vison pro th8320u and i cant get aux heat to operate also aux heat on will not come up on the touch screen.

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