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

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SECO TA2000 to Honeywell RTH7000 wiring diagram

I am trying to wire in a Honeywell RTH7000 thermostat but I cannot get the heat or the AC to come on. The fan works fine and the thermostat kicks on and off. I must have some wires off somewhere. I cannot findout what X and O or for on the SECO and where they go on the Honeywell.

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  • CaptainJava Jan 04, 2009

    same problem but trying to go from the SECO TA2000 to the LUX. No X on the Lux and nothing in the manual about it.

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I found one answere where X goes to C.

Posted on Jan 04, 2009

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Honeywell RTH230B cooling problems...


I printed out the instructions for your thermostat. It looks like you should have the following.

There should be jumper wire between Rh & Rc

Red wire to Rh or Rc whichever is easier since there is a jumper. This is the hot wire and all the thermostat does is connect to route it to the components needed for heating or cooling.

Blue wire, tape it up and don't use it. There is no spot on this thermostat for it. It is only used on thermostats that are powered by the transformer.

White wire to W. Powers the heat relay

Yellow wire to Y. Powers the cooling contactor

Green wire to G. Powers the indoor fan relay

There is a black jumper on the back of the face plate. Look at section 2.4 Setting J2 Jumper in the installation instructions. Make sure you have it in the right position for what you have. If you don't have them just google them.

Hope this helps.

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1 Answer

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What are you setting the thermostat to when you turn on the AC , if you turn on the AC and the house is warm you will need to turn the AC down to a lower setting before the the AC will start up.

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1 Answer

I just purchased a Honeywell RTH2310 and cant get it to work. I have a gas furnace that has two wire R and White. I tried connecting to Red-Rh and W for white, with and without the jumper for Rh and Rc....


red is 24volt power, white is load,I.E. relay,touch the red and wht wires together, the furnace should start, if it don't the problem is the heater, Rheat-Rcool you have a heat/ac thermostat, no ac forget Rc,try turning thermostat all the way up, dig up a multi-meter or powered light tester, touch Rh with one wire of tester,touch the other wire to different terminals until it lights,hook up your wires, you should have heat

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1 Answer

My ac unit wont turn on or off after i changed the thermostat


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1 Answer

Just installed the honeywell thermostat. the ac turns on, but not the heat. what do we do?


Some of the thermostats from Honeywell require a jumper wire on the thermostat between the RC and the RH connection for the heating to operate. It is possible that your installation needs this jumper wire installed for the heating to work.Verify that this jumper wire is installed if your thermostat requires it. If it requires the jumper wire and you do not have one you can cut a small piece of existing wire on the connections to make a jumper wire. There are also some thermostats with a jumper switch for electric heat and gas heat...make sure that it is on the proper setting.

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2 Answers

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1 Answer

I had an old thermostat that i had to change need wiring diagram


HONEYWELL WEBSITE:
Go to honeywell.com
Under red welcome sign
Bottom red highlighted box literature/image search
Type in thermostat model number
Click on arrow to right
Then click on the PDF files owners manual / installation instructions

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WIRING DIAGRAM LOST FOR NON-PROGRAMMABLE CT87


Red is power return to turn on heat

White is common power to both heat and cold

Blue is power return to turn on AC

You can get specific guidance on wiring at the Honeywell Website.
http://customer.honeywell.com/techlit/pdf/69-0000s/69-0274.pdf

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