Community Forums

BFlinn181 · 04-20-2016, 08:26 AM

O.K., I have no doubt you hooked up the wires as described, BUT how do you switch between A/C and Heat pump? Also, when you say the A/C and heat are on at the same time, you aren't talking about the furnace heat, are you?

The A/C can't be both in cool and heat mode at the same time. If the A/C is on cooling, the heat must be from an electric 'emergency' heat grid in the A/C duct.

How did you turn on the electric heat grid in the previous set up?

Old-Biscuit · 04-20-2016, 10:28 AM

Did you program the Honeywell

Function 2....Heat Pump

???????

shift10gears · 04-21-2016, 08:10 PM

first of all I want to say thanks for helping me and being so patient. When I say the heat comes on its from the floor like a furnace. the ac is on roof . I programed the Honeywell to function 2-1 but I don't know if I did it right? please help me, thanks

BFlinn181 · 04-21-2016, 09:15 PM

So, no heat pump and the heat is coming from the floor vents. The floor vents are connected to your 12 v LP gas furnace. The A/C is controlled by the thermostat but is 120 v. If the A/C and heat are on at the same time, and you've verified the wiring and color of wires, I think you'll need to contact Honeywell. Perhaps the thermostat is faulty, or maybe you have a wire that's touching two posts at the hook up points.

shift10gears · 04-21-2016, 11:01 PM

how about installing old thermostat and if I got same problem then it is Honeywell??????? could it be the function maybe I set up Honeywell wrong

shift10gears · 04-23-2016, 12:22 PM

I just got home and took some pictures

shift10gears · 04-23-2016, 12:29 PM

here are the pics

shift10gears · 04-23-2016, 12:31 PM

The red wire is capped off with yellow wire nut.
The blue and yellow(one with red clip)wires are for the Hi switch for ac

shift10gears · 04-23-2016, 12:36 PM

I set up honeywell thermostat to function 1, setting 1
Maybe this is the problem, wrong set up

shift10gears · 05-29-2016, 08:00 PM

Just want to say thanks to this forum and especially to the 3 people that help me with this problem. Thanks

I figured out with this Honeywell thermostat RTH5100B

you have to turn to page 12 of the quick installation guide book(i posted a picture of it above). I was having problems with the fan not shutting off and the AC not turning on. I talked with bFlinn 181, old-biscuit and Ronninflorida that really helped. The problem was the set up pg 13. In order for the AC to come on the function must be set to 1 and the setting to 0. Since the thermostat is for a house you must wait about 5 minuets for the AC to come on. During this waiting time the "cool on" should be blinking this is a safety feature so it doesn't mess up the compressor. After the AC comes on the blinking will stop after that you wont have to wait the 5 minuets only during the first time. Another thing that will help is don't buy the smallest micro switch you will be fighting with it the entire time. get a regular micro switch with the 2 prongs at radio shack and the 2 female 1/4" insulated connectors(in picture above with yellow wire connected to it) for the HI/Lo switch(the switch would have 2 prongs on it,picture above, 1 prong of switch goes to blue wire and other side of switch prong goes to the yellow wire, capping off the red wire).

Thanks again everyone

BFlinn181 · 05-29-2016, 08:31 PM

Glad to hear it's working for you. Now write down the proper settings so you don't have to go through it all again when you change the battery in the thermostat!