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

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Furnace and air conditioning turn on simultaneously

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Thermostat bad or wired wrong.
Check that white and yellow(or Blue) are not touching somewhere

Posted on Feb 04, 2010

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YEA you have the t-stat wired wrong or the computer board has gone out

Posted on Mar 15, 2010

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1 Answer

Furnace heats up fan turns on then turns off 2min later then back on backoff might finish cycle


Sounds like an air flow problem furnace going off on limit check filter and blower could have a clogged air conditioning. A coil. 20 years plus experience in this fieldl

Jan 18, 2012 | Bryant Heating & Cooling

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I have a Coleman/Evcon furnace model #DGU08016UB that has a concern. In my attempt to check my furnace before we need it for the winter; the following condition occurred. Condition: Flashing code of...


jump out pressure switch see if it lights check hose to pressure switch see if they are split or connections are not good ,cut off ends and put back on presure switch.

Sep 21, 2011 | Coleman Heating & Cooling

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What are twinned units?


Twin units can be two airconditioner condensers and/or two furnaces. Most manufacturers make a twinning kit that will wire two units together to operate simultaneously by one thermostat. At times, one may operate as a first stage of heating (cooling) and then the other unit can operate as second stage. Twinning unit are beneficial in commercial buildings where the load conditions vary constantly. For instance, if you twin two 4 ton units together. On a nice cool day, you may only need 4 tons of air conditioning. So, the thermostat will only turn on one unit. On a hotter day, you may need 8 tons of air, so the thermostat will turn on both units. In case you are thinking about doing this, the biggest mistake in twinning units together is using a common return air for the furnaces. Make sure you separate the return air cavities and ductwork for both of your furnaces If you don't have separate returns, you have the possibility of one of the blowers starting backwards. (talking form experience LOL)

Aug 13, 2011 | Heating & Cooling

1 Answer

I have an Aprilaire 550 model. I just noticed that it is not turning off when the furnace turns off. Please advise


Hi,
The solenoid vlave is stuck in the on position and will need to be replaced...



Here is a tip that wrote about how to buy heating and air conditioning parts online.

How to find Air Conditioning, Heating and Furnace parts online.


heatman101

Dec 25, 2010 | Aprilaire Humidifiers

1 Answer

Heat pump and gas furnace running at the same time.


An explanation....

When in the heating mode, all heat pumps are dependent upon the outdoor conditions to remove heat energy from the environment and turn it into useful heat for your dwelling.

Heat pumps operate more effectively in temperate climates (as in southern states) and if it's as cold as you say, then the furnace is coming on to add auxiliary heat to the space to make up for the lack of heat being supplied by the heat pump. This is normal.

Some heat pump systems are or can be equipped with a control known as a "low ambient cut out" and/or "motor master" that prevents the heat pump compressor from operating and slows or stops the condensing unit fan when it's too cold and risking potential compressor damage. When it's in the single digits outside, a heat pump is only marginally effective. and usually requires auxiliary heat (your furnace).

If the furnace keeps operating when it's in the 30s or 40s, you may want to have the system examined by a competent service technician. As always, the outdoor condensing unit should be kept clean and the furnace filter should be changed no less than monthly, unless you have an electronic air filter.

Jan 07, 2010 | Heating & Cooling

1 Answer

Day / Night HVAC is running cool air BUT the furnace is running 2


Strange. Does the thermostat control both the air conditioning units and the furnace. If not make sure the furnace thermostat is turned down to below 65 degrees.

Jun 29, 2009 | Honeywell Programmable Thermostat Heater

1 Answer

I want to know the conection between the thermostat and the fan and compressor in the central air conditions


r and rc @stat to r on furnace
w @stat to w on furnace
g @ stat to g on furnace
y @ stat to y on furnace
from furnace 2wires going to out side unit typical red & white wire. red goes to y @ furnace and white goes to the neutral of the trans former . BE SAFE turn off power.

r = Red wire Hot
w= White wire heating
g = Green Fan
y= yellow cooling

if their is a B or C @ the furnace terminal board that the neutral . Tom

Jun 14, 2009 | Fujitsu 24C1 Air Conditioner

1 Answer

Central air conditoner unit doesnt blow cool air into home has some ice on the inlet heat and cooling lines going into the central air unit


Change the furnace filter. Make sure you use a cheap one when air conditioning, as the better ones restrict airflow when they filter out so much stuff and then plug up, not allowing enough air to pass over the cooling coil in the furnace's air plenum. Turn the A/C off for a few hours (with only the furnace fan on if possible) to melt the ice off the cooling unit inside the furnace.

Sep 01, 2008 | Carrier Heating & Cooling

1 Answer

Air Condition will not come on. We have tried to flip the breaker but no success. The fan on the air condition inside and on the outside is not turning.


If you have one of those new digital thermostats try changing the battery. If your air conditioning is run through a central heating system the power must be on to the furnace. 24 volt control circuit gets its power from the furnace in this kind of case.

Jun 30, 2008 | Heating & Cooling

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