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

1 Answer

How to wire Honeywell thermostat RTH7500 from old Weathertron GE

I bought a honeywell thermostats RTH7500 for a replacement of my old Weathertron (GE) Bay28x139,Bay28x141. It has 8 wires. I connect the wire based on the new manual that comes with the package.I wired the 'B'(blue) wire goes to 'C' per manual instruction, 'G' green wire to 'G', 'Y'(yellow) wire to 'Y', 'O' orange wire to 'O/B'; 'R' red wire to 'R', 'X2' (Black) wire to 'E', 'W' white wire to 'Aux' and 'T' brown wire with no corresponding wire equivalent to the new thermostat, I taped it out away from the other wires. After I turn-on the furnace and the circuit breaker and turn on the thermostat. The thermostat display is in normal mode and I change the setting to COOL. We waited for several minutes probably an hour. That time the current room temp is 84F and I set it out to 70F. To make it colder.I saw in the display the current temp is dropping as the mins. progresses but when I check the air in the vent, a warm/hot air breeze goes out not cold air.Does my connection is right? Is this thermostat compatible with my old thermostat? What can you recommend? What shall I check? I would appreciate if you can assist me with this problem. I decided to replace the old one since it is no longer, I think accurate since it is really old. The furlace will shotdown more or less in 20 to 25 mins. approximately. I am trying to isolate the problem? Is it from the thermostat or the furlace? How come when I put it back the old thermo, it's only in fan mode? I can't isolate the problem bec. the Honeywell thermo doesn't work. It gave us warm/hot air in cool mode. Hope you can help me with this, please. Many Thanks.

Posted by on

Ad

1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

    President:

    An expert whose answer got voted for 500 times.

  • Master
  • 1,902 Answers

You have a control board on your furnace, there is a 3 amp fuse there, that 3 amp fuse needs to be replaced. You most likely touched a wire even by accident and blew the fuse. You will have to remove the door \panels to get at it. It looks like a normal car fuse

Posted on May 31, 2010

Ad

1 Suggested Answer

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of.(from cars to computers, handyman, and even drones)
click here to download the app (for users in the US for now) and get all the help you need.
Goodluck!

Posted on Jan 02, 2017

Ad

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

Bought new thermostat model ct87k but old Honeywell model I have was hook up by black and white wire not red and white , so how do I hook up.


The two wire Honeywell T87 and CT87 is nothing but a switch in a control circuit. Wire color is not important at all. What is important is the TERMINAL DESIGNATION those wires are hooked to. Soooo....take the wire off of the sub base of the old stat terminal marked 'R' and attach it to the new sub base terminal marked 'R' and so on. Wire COLOR means nothing at all in your case.

Oct 04, 2014 | Honeywell CT87K1004 Round Heat Only...

1 Answer

Heat/Cool does not respond after replacing Trane Weathertron BAYSTAT239 with Honeywell RTHL3550


Sounds like you didn't turn the power off and blew the low voltage fuse. Typically a 5 amp blade style (like a car) inside furnace. TURN THE POWER OFF!!

Jul 13, 2017 | Heating & Cooling

1 Answer

I need to replace an old Thermostat that just has 3 wires coloured Red, Blue and Yellow. The Honeywell THR830TUK Thermostat I have bought shows 5 wires on the diagram. I'm not sure which wire goes into...


The honeywell THR830TUK thermostat does not require a neutral as shown in the instructions.Connect the LIVE to terminal "1" and your YELLOW SIGNAL wire to terminal "3".
Connect your EARTH (if you have one) to the EARTH connection on the top left hand corner of the thermostat and blank off your NEUTRAL wire with a block connector.These instructions were supplied to me by Honeywell Customer Support.Hope this helps.

Jan 08, 2011 | Heating & Cooling

1 Answer

I bought new Honeywell non programmable,letters are different.


If you have a 5 wire thermostat then you have a two transformer system a cooling transformer and a heating transformer.
The cooling transformer wires to Rc - Y - G,
and the heating transformer wires to R - W the R terminal heating would be the #4 terminal from the old stat.

Aug 12, 2009 | Honeywell Electronic Programmable...

1 Answer

System will not turn off


Call the honeywell technical service number listed on the instruction sheet for the thermostat.
They can verify if you have the correct stat for your application and the wires are connected to the right terminals.

May 30, 2009 | Heating & Cooling

1 Answer

Need wiring for honeywell pro 3000 in trane xe1200


the pro 300 is a single stage thermostat and can not be wired to control 2 heat stages seperately

May 16, 2009 | Heating & Cooling

1 Answer

Updating old honeywell thermostat with a new honeywell thermostat


check in the unit heater to see what is hooked up most only need to have red from transformer white to call for heat and green to make the fan run in man and somtimes common usually blue or black

May 09, 2009 | Honeywell Programmable Thermostat Heater

2 Answers

Trane weathertron thermosatat


OK. Here is a Trane Weathertron BAYSTAT240 thermostat wiring picture. This heat pump w/ electric (emergency) heaters is running right now. Notice the G terminal has green wire, the R terminal has red wire, the white wire is jumpered from W to X2, etc. The black wire loop you see in the center hole is unconnected.

_1412.jpg
This unit is adjusted by leveling the base - loosen the screw to the left of "R" and the one to the right of "F". Twist the base clockwise to RAISE the indicator. This makes the mercury in the switch turn ON at a different temperature. Remember to tighten those 2 screws again.

You will have to experiment several times to make the unit read exactly right. If the tech installed the base exactly level, the unit would read right (it says here).

Mar 20, 2009 | Heating & Cooling

3 Answers

Honeywell Thermostat RTH 7500


Assumed all the wiring are correct,

to change from manual switching from heat to cool, press [system] button ( left ) to go into system setting.

then press and hold the [fan] middle button untill option display 120

use up down button to select option 300 ( Manual/Autochangeover) ,

select 0 for manual, 1 for automatic. ( read caution in page 22 of installation manual )

Good luck

Sep 30, 2008 | Heating & Cooling

Not finding what you are looking for?
Heating & Cooling Logo

1,083 people viewed this question

Ask a Question

Usually answered in minutes!

Top Honeywell Heating & Cooling Experts

Bill Long

Level 3 Expert

587 Answers

Paul Carew

Level 3 Expert

2597 Answers

vance jones

Level 2 Expert

120 Answers

Are you a Honeywell Heating and Cooling Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...