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Runs cooling and heating back and forth, when colling set at 73 and heating 65 , wont come off 73 degrees , bad t stat ? or outside temp sensor please help thanks chris

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Hi, Chris, this is the thermostat for sure. It has a built in sensor on the circuit board that gives the stat the command to do what its supposed to do. From what you are saying, it has to be the stat. Be sure you mark the wires on this stat, if you have a gas furnace with this central unit, the stat will have markings at the terminals like this, Red wire to either the Red R/C, or R/H with a jumper across the 2, a W, white for heat, Y yellow for cooling circuit, and G green for the fan control. The new stat will come with the red jumper installed for you. Now, if you have a heat pump, the terminals will have more wires such as a R, O, B, W, W-1, Y, G, C, and so on. Heat-pump wiring is much more difficult to install the stat as it has to have the same terminals and if they are not terminated right, you will have problems. You may want a pro to wire it in for you only if you have a heat-pump. If its just a standard stat like I 1st said, turn off the breaker and it is simple to install. The voltage is only 24 volts ac. Please don't forget to rate me Chris as I know you will be kind, and I will also be checking in on you to see how it is going. You can also contact me if you need more help by my user name below.
Sincerely,
Shastalaker7
A/C, Heating, & Refrigeration Contractor.

Posted on Sep 03, 2010

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Goodman gph1348m41ac unit is blowing cool air in heat mode with mid 30s ambient outdoor temp. I turn it off then on and will usually blow warm air but this cycle is becoming more repetitive. any expert...


A heat pump on the optimal heating day (about 50 degrees ambient) will only deliver approximately 85 degree air as compared to 125 degree air from a fossil fueled furnace. The colder the outdoor air is the less heat there is available to be transferred to the living space. At 30 degrees, the heat transfer capability is getting close to negligible meaning the run cycles will be approaching continuous and eventually as the heat pump along cannot maintain setpoint, the outdoor stat or stats will bring on auxilliary heat in the air handler.

If your ambient temp is below the 'balance point' of the heat pump, the house temp will drop a little lower and most times energize the heat strips through the outdoor t-stat. Your outdoor stat could be set too low for the heat pump to carry the structure all the way down to the balance point so when you turn it off and back on, the lower indoor temp automatically brings on the heat pump plus a heat strip or two, thus the warmer air. Second stage on the stat satisfies due to the heat strip, drops them out of the circuit and the heat pump is left running on first stage heat delivering the perceived cold air.

Your outdoor stat could also be not functioning correctly and not allowing the heaters to come on until the system is turned back on reestablishing the two stage call for heat.

Tons of possibilities and not enough room to list....

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1 Answer

4 ton Amana -heat comes on sporadic in spring and fall (Every season change) Heat worked through 20 degree weather. Thermostat at 74. Today is 100% humidity and 52 degrees outside and heat won't work. By...


Assuming this is a heat pump I'm guessing you have a bad temp sensor. Your outdoor fan is likely controlled by a temp sensor so it only runs as needed during heating. Fan not coming on and compressor still needs cooled therefore compressor protection kicking in?????

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Trying to set thermal stat to cool


Look at the bottom of the T'stat or in the newer ones click menu and follow instructions to preset individual days or on some week and weekend if there is a switch at the bottom set it on the cool selection click the menu button if it has a next buttton then click it until it gets to the degrees and push the <or> button until you get to the temp you want it to be at and then click next until you have all the days programed to the temp you want it to stay at and when your finished push the done button if it has one and it should be programed for the cool side to set the heat set it to heat and do the same as you did on the cool part remember down for cool and up for heat on the degrees you set them on example if you set it 78 for the temp on cool and during the day you want it cooler set it to lower temp say76. if you set it 79 then it won't come back on until the temp is 79. Maybe this will help some programable t'stat are a little more complicated then this

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Furnance will not start until room temp is at least 5 degrees below set temp ie temp set at 70 , wont start till it reaches 66 or 65 degrees


themostat is bad, or the heat anticipator on the stat is bad, which means you still need a new stat

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1 Answer

I have a westinghouse window unit and I think it has heat strips for the heat. How do I tell if it is a true heat pump or if it has heat strips and how do I get to the Heat strips in the unit to check.


If it is a heat pump, the compressor will be running both in cool mode and in normal heat mode.

Confirm the current indoor temperature. Turn the thermostat up one degree at a time until it comes on. This will typically be 1 to 4 degrees increase. As soon as it comes on stop increasing the temp.

If the compressor is running, it is a heat pump.

Check the temperature coming our of the vents at that time. You should have 30 to 60 degrees increase from the air temp going into the unit and the conditioned air temp coming out.

Then turn the T-stat up another 10 degrees. If the temp coming out of the vents increases by 20 degrees or more. the strips are on.

The strips operate in three situations.
1) the system is set to emergency heat
2) The heat pump cannot keep up with the demand for heat. (because its too cold outside, the desired temp setting is greater than 4 to 8 degrees above the room temp, or the HP is malfunctioning.)
3) The HP is in defrost mode

You could also take the panels off the unit and look for a reversing valve, but unless you know what you are looking for you will not recognise it.

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Need to know coolant temp operating range for 1988 Seville


Entirely possible and in range. Depends on outside temps and type of driving. The radiator is colled by electric cooling fans, controlled by temp sensors. Fans should come on automatically when a/c is turned on

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I have a 3 ton Coleman heat and air pump and when I turn the air condition on the heat strip comes on at the same time


If you are calling for heat and the thermostat is set for 2 degrees higher than room temp, the heat pump and strips come on.
When the room temp and stat temp are less than 2 degrees the strips turn off.
That is, unless the installer wired the t-stat for the strips to stay on.
If they are coming on in the air/cool mode then you have a bad heat relay or a t-stat wire shorted.

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1 Answer

We recently bought a new house (to us). It has a Goodman heat pump and Goodman Electric backup furnace(A36-15) with a Janitrol stat. I switched the stat to emrg. Heat when the temp got below...


If you have a volt meter, check to see if you have 24 volts coming from the thermostat on the yellow wire.

If you do, and it is set on emer heat, you have a bad T-stat.


It looks like it is wired properly.

If you have no meter, you could try changing the stat, I reccomend Honeywell or white rodgers.

Let me know if you eliminate the Tstat as the problem and we can go from there.
Chances are its the stat.

Dec 06, 2008 | Heating & Cooling

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We had a Honeywell 5220D installed by a HVAC company in April. Now my AC runs fine during the day and at night about 10PM the inside fan continues to run the thermostat is not yet at temp and the outside...


make sure the temper differ in cool mode are set 40-90 this is also a programable feature of this t-stat , by the way it also has offsets in the heat mode you might want to check this as well and make sure they are set check all wire connections for tightness and placement, also check to see if the t-stat is set to change from heat to cool auto mode or manual set to manual

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