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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1 Answer

What does the "auxillary heat"


Auxiliary Heat is used to turn the electric heat strips ON, If the heat pump is not working. Or if the heat pump can't bring the space temperature up to Set Temperature it will display Aux Heat ON....... Assuming you have a Heat Pump System with Auxiliary Electric Heat as Back up...... If the tech didn't install a jumper wire from AUX to W on the subase which is in back of the Display on the Thermostat.....you won't get Auxiliary Heat if the Thermostat is set for Auxiliary Heat. Other wise the thermostat will turn the heat pump on first and then the electric heat (Aux Heat) if it needs it to satisfy the set temperature....... Hope this helps

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I have a new bryant 2.5 ton 410 puron heat pump and it shut off when the temp get cooler. The temp right now is around 36. Is there anyway to get it to shutoff at a lower temp. so the aux heat won't kick...


Heat pumps only work down to a certain temperature, 35-40 degrees outside temp. Once it gets that cold the system cant pull any heat from the outside air and the aux heat kicks in to make up the differance.

Nov 23, 2010 | Heaters

1 Answer

Energy Knight heat pump refuses to blow!


Does this problem happen when the temperature is below 30 degrees? When it gets about that cold outside, the air outside is too cold for the heat pump to "steal" heat from. On the thermostat you'll find a switch labeled aux or emergency heat. Turning this switch on will operate a traditional coil heater inside the system, providing you with heat. The only downfall to this is that it uses more energy to heat this way. Try turning the fan switch from "auto" to "on". If the fan comes on, then we can rule that out. If the aux heat switch is NOT on, set the thermostat such that the system will try to heat. If the outside unit is running, the problem is either it being too cold like I said earlier, or there's a problem with the heat pump's mechanical system that needs to be serviced by a professional. If the outside unit doesn't run but it should be, check it's breakers at the panel, the breaker inside the electrical box that feeds it, and look to see if there's a reset button on the unit itself. Finally, check the air handler (part of the system inside with the fan in it) to see if there's any circuit breakers or fuses on this unit. Make sure they're not tripped/blown. If none of this helps, you definitely want to get a pro to work on your system.

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My newly installed Honeywell RTH2410 keeps running the Aux Heat and we have it set on 68 Its been like 55 outside so there is no reason for the aux heat to kick in. I followed the wiring directions, but i...


I'm having the EXACT problem. I called Honeywell. They said that there's an internal algorithm that decides when to use aux heat and that there are no user-settings to determine when aux-heat is used. I told them they have a lousy algorithm.

Jan 25, 2010 | Honeywell Heaters

1 Answer

Buzzing sound when aux heat comes on


Sounds like it could be a effiency function to warn you that the heat elements are on. Check your thermostat manual and see if you can turn this feature off. If this is not a feature then the thermostat may be wired wrong or something in the circuit may be trying to short out.

Jan 04, 2010 | Honeywell Electronic Programmable...

1 Answer

I'm trying to hook up a honeywell touchscreen thermostat and need to know what wires go where.


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1 Answer

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1 Answer

Honeywell Thermostat


Make sure G from indoor unit goes to G on thermostat for fan continous fan, if that doesn't work and you have 24 volts to R and C then the t'stat is bad.
For 2nd stage heat or aux.heat, on the indoor unit you need to make sure the wire W2 from the indoor unit goes to W2 on t'stat.
You don't need any wires from W1on the indoor unit to W1 at the t'stat because with a York heat pump Y1 is the contactor which turns the compressor on and you will get 1st stage heat, and for cooling the t'stat will also bring on O which is the (reversing valve) or cooling changeover relay for the cooling mode.
C = common usually black wire
R = hot usually red wire
Y or Y1 = contactor
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B = Heating changeover relay
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1 Answer

Thermostat says ''Aux heat on'' and buzzes when we turn on heat


You most likely have a heat pump, the aux heat (usually electric) comes on anytime the room temperature is 4 degrees below the thermostat setting. Does the buzz go off when the aux heat lite goes out? If the aux heat does not shut off then the primary heater (heat pump) is not putting out enough heat to satisfy the thermostat. I need a little more info. Do you have a heat pump? Is it working?

Nov 19, 2008 | Honeywell Electronic Programmable...

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