Question about Source1 CTS Series Model S1-THPU32P7S Color Touchscreen Thermostat

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Can't get the gas furnace to heat.

I have a York YZE 2 stage heat pump and a modulating gas furnace with ECM connected to a THPU32P7S source-1 t-stat. I changed out the old Honeywell 8300 stat and it's never seemed to work very good since... Can't get the gas furnace to heat.

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All York/JCI thermostats made by Venstar

The setup is probably incomplete. Did you configure the thermostat for a 2 stage heat pump? The heat pump should have a thermostat wire connected to R, C, Y1, Y2, and O, that makes 5 wires. I suspect you are only using first stage compression and or first stage blower speed.

Posted on Dec 12, 2013

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1 Answer

Can I connect a programmable thermostat


Connect to Coleman Presidential II 7670 model in a mobile home >gas > no cooling> maybe heat pump > it only has two wires and both are green
Dec 02, 2014

A heat pump connected would require quite a few additonal wires and a standard central A/C would require a total of 5 for a good quality programmable with single stage heat and single stage cooling in the circuit.

The two wires you refer to should be all that's required to operate heat only with a standard thermostat. You must do one of two things though to add a programmable thermostat:

1) Either select a programmable stat that operates on battery power alone, necessitating periodic battery replacement or,

2) Prepare yourself to pull at least one additional wire from the furnace to the thermostat location.

The two wires, if utilizing a battery powered stat can go to either R or Rh and to W. Either wire to either terminal because you are only completing the one circuit. Ideally you would want to locate which of the two is the one directly off of the ' hot' side of the transformer.

If you opt to pull an addiional wire for a thermostat of a superior quality, you will HAVE to determine which of the two green wires is the hot side of the transformer and it MUST be connected to R or Rh. The second green wire goes to W. The third wire that you had to add must go to the C thermostat terminal. That same wire has to be connected to the neutral side of the transformer to complete the circuit. Most programmable t-stats require both 24v hot and 24v neutral to operate, then have the battery for back up during a power failure whereas the battery powered stat runs entirely on the battery and not 24v from the furnace.

If you are unable to determine the wire connections as outlined above, do not attempt it....remember you are working on an LP furnace !!! Any doubt on the ability to ascertain correct locations for the terminations requires you to contact a qualified technician as there is only so much that can be gleaned by a person in a remote location from a typewritten description of the situation.

Nov 30, 2014 | Heating & Cooling

1 Answer

How do I troubleshoot a goodman 2 stage that always starts at high stage


It wouldn't be stuck if that's the case the valve would never shut off. Sometimes those 2 stage heat thermostats stats call for 2nd stage if the room temp drops more than 2 degrees. Easiest way to check is take the w2 wire off of the tstat and try a call for heat. If the furnace kicks on both 1& 2 stages then its either your wiring on the fan board or a dip switch setting. If it kicks on 1stage then it's your thermostat.

Mar 19, 2013 | Heating & Cooling

1 Answer

I replaced an old mercury T-stat (York with model number 2TH11704024) installed a new T-stat (RTH6350). The wires that I I have are O (orange), G (green), Y (yellow), T (gray but not used in new T-stat),...


Did you shut the power off to the air handler/furnace...... before you installed the new thermostat??? You may have shorted out the transformer or blown the transformer fuse...... If you try to put the Fan switch on the stat to Fan ON does the fan come on ..... if it does the transformer is OK.. On the new thermostat did you program it to tell it that you had a heat pump system ???? Looks like you had it wired right. Here is a pdf manual for a RTH6350 http://customer.honeywell.com/techlit/pdf/PackedLit/69-2416ES.pdf

Its on page 13 Advance setup for tell the new stat that you have a heat pump....There is also a Honey well Hot line on page 2 Hope this helps.

May 01, 2011 | Heating & Cooling

2 Answers

I am trouble shooting a Bryant Hi-bred system that uses an air cooled heat pump with high efficiency gas furnace for backup and low ambient operation. How does the system decide whether to use the air...


Your t-stat should be set up so that the furnace is the second stage heat and also emergency heat. First stage (heat Pump comes on) sometimes they use Time to start 2nd stage, sometimes they use outdoor temp and this all bepends how bryant has set it up, without a model # I cannot tell you but send it and i will look in somebooks i have to tell you.

Mar 01, 2011 | Bryant Heating & Cooling

1 Answer

I installed a new Honeywell Programable thermostat, When I turned on the AC it turned on the Heater... I followed the wiring but some of it is not making sense... G=Green, Y=Yellow, R=Red, C=Blue,...


Hi, the problem is you have bought the wrong thermostat for the unit if it is not a heat-pump. A heat pump will have W-1, W-2 for heat strips, and Y-2 is for 2nd stage cooling. G is Green for Fan, R is Red for Power, Y is Yellow for cooling, and W would be for Heat. This is all you need if you have gas heat, Orange is for a reversing valve for a heat-pump, and the blue is also for the reversing valve on a Rheem heat-pump. The stat you need will have these terminals, if you are sure its not a heat pump, which I am sure you would know. The stat you need has these terminals. RC and RH. It will have a Red jumper wire connecting the 2 terminals. This is where the Red wire connects, to either one, as they connect together. Connect G to Green, Y to Yellow, and W to white. Since you only have one control transformer, that's why the stat has RH for Red Heating, and RC for Red cooling tied together. Just hook the red coming in to either one. You need only, R, G, Y, and W, to run this unit. Look at your old stat and check the terminals. A heat-pump, uses many more conductors to operate it. O or orange for the reversing valve, blue also depending on the unit. C for common, W1 for stage one heating, W2 for stage 2 heating, Y1 for stage one cooling and Y2 for stage 2 cooling. This stat is used for a commercial unit with multible stages of heat and cooling. If you have a common wire and no batteries on the old stat, go to the indoor unit, remove the panel, and see if you have a common wire hooked up, such as the brown, black, or maybe blue. If so, you will need to hook it up at the stat if it has a C terminal. If it has batteries, just take all of the extra wires and shove them in the wall. You won't need them. Just the R, G, Y, and W, and you will be back on line. Very easy.
Please rate me. Take it back and have them sell you the right stat. Please keep me posted and I will be here if you need my help. Thank you for using Fixya.
Shastalaker7
A/C, and Heating Contractor

Nov 23, 2010 | Goodman Heating & Cooling

1 Answer

I am installing a totaline progammable thermostat, the old one is a rheem, i hooked the b wire to the b terminal the r wire to the r terminal the g to the g terminal and the y to the y terminal the e l and...


First off, make sure that the wires you are connecting at the thermostat match the circuit board of the unit. It is good practice, but not always followed to do a "1 for 1". To answer your question, W2 is simply when there is 2-stages of heating. If your furnace does not have 2-stage heating, then leave it empty on the t-stat. "C" is common. Common is neutral, so it should have continuity to the ground or L2. If your old stat did not utilize this, I wouldn't worry about it, unless the new stat is a touchscreen and constantly lit stat. Just keep this in mind. W-warm (heat), Y-cooling, G-fan, R-hot (main 24v power from furnace to thermostat), C-common (not always required), AUX (auxillary, if there wasn't one used on your last furnace, I wouldn't worry about it.). X may have been a common, or a dead terminal.
Bottom line, if you open your furnace to see the circuit board and where the thermostat wire connects, and match above, you should be just fine. Make sure you turn power off prior to opening the furnace, and when landing the wires on the stat. You could inadvertently blow the 24v transformer.

May 08, 2010 | Heating & Cooling

1 Answer

New thermostat not cooling. Blowing heat instead.


Hello You have only 5 wires? multi stage if so ,is run by something else.Check that RH/RC is jumped out on new stat.Also check that O is not on the B terminal.If there is an A/B select switch set it to O.Emergency heat button dont matter as there is no wire to run it with only 5 wires.

Apr 17, 2010 | Honeywell Programmable Thermostat Heater

1 Answer

Where does the W2 wire go?


w2 wire is second stage heat does your furnace have two stages.look at gas valve it would have 2 valves/ sol w2 will go to w2 on stat. if a single stage furnace w2 is not used

Jan 25, 2010 | Honeywell Programmable Thermostat Heater

1 Answer

What is the difference between stage two and aux heat?


The furnace shoud be wired to W1 amd EM Heat. If your heater is a two stage furnace then hook the thermostat W1 to stage 1 amd W2 to stage 2. Most new 2 stage heaters will control stage 2 with the control board.

Jan 03, 2010 | Heating & Cooling

1 Answer

Heat pump wiring


yes i can , you need to hookup the r and the o together so that the reversing vvalvce is allways energized . so with that im mind send r,y,c,o to theout side unit. at the ahu you'll hook up the 5 wires for the furnace, r g w1 w2 com and at the thermostat r,w1,w2,y,g,com,o then you will be set (the o get hooked up to o and goes straight out side.

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