Question about Honeywell Programmable Thermostat Heater

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Installed honeywell rth7400d and now my system is freezing up

Condensor not coming on after i installed honeywell programable thermostat a/c unit freezing up.

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  • Honeywell Master
  • 1,033 Answers

Is this a heat pump unit?

Posted on Dec 02, 2012

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Posted on Jan 02, 2017

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Buffalo12980
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SOURCE: installing a honeywell CM900 wireless programmable thermostat

the analog unit uses just two wires for heat. red - white. there is a heat anticipator setting that must match the burner current. check your programmable specs and follow instructions.

Posted on Dec 07, 2007

SOURCE: Honeywell Thermostat RTH7400D

The thermostat will not cut off the A/C until the thermometer reading gets to 76.

If there is not a heat source near/behind the thermostat which is causing the thermometer to read higher than actual room temperature, it sounds like the thermostat thermometer is out of calibration.

There are ways to calibrate it, but much to involved to go into here.

One solution is to just set the thermostat at 80, knowing that it's really set on 76.

Another solution is to replace the thermostat.

Charlie

Posted on Aug 14, 2009

billyvangogh
  • 108 Answers

SOURCE: need to wire a honeywell RTH7400D thermostat to 3 wire hot water

Just mark the old wires on the old thermnostat...R , W etc...and put them on the same terminals on the new 1.....also there should be some adjustment ire : switch on the back or under the cover to adjust for Hot water heating or electric heat...either is the setting you should have it on....also you shouldn't setback the thermostat at night or when away very much....2 degrees is fine , as the boiler will run along time to raise the temperature in the morning and may not get there by the set time

Posted on Oct 26, 2009

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Does thermostat have to be on Auto or On to make my heat come on?? Dont know if i have thermostat problem or Furnace problem. Furnace clix on whenever it wants to, doesnt use the schedule i have...


If the thermostat is wired correctly, and matched to the type of heat you have ie electric, heat pump, boiler, forced air, gas or oil, the heat should run in either Fan ON or AUTO. Maybe you can explain your system a little more in depth...furnace type, M#, & thermostat brand w/ M#.

Dec 12, 2013 | Honeywell Programmable Thermostat Heater

Tip

Honeywell RTH7500D Thermostat


This Honeywell thermostat is a good medium priced thermostat that will give you many bells and whistles at a very good price. The programming is very easy to do and of course the thermostat is very reliable also.

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The installation of this thermostat is very easy and if you need help with the installation you can go here to see the complete installation guide.

http://customer.honeywell.com/techlit/pdf/PackedLit/69-2221ES.pdf

If you have lost your owners manual and need a copy of it you can go here

http://customer.honeywell.com/techlit/pdf/PackedLit/69-2222ES.pdf

With the help of these .pdf files you can get all the information that you need to install and troubleshoot your RTH7500D thermostat.
If you are replacing a thermostat make sure that you turn off power to your heating or air conditioning system BEFORE you start removing any wires. Failure to do so could cause you to burn out the 24v transformer of your system. Also make sure to mark all wires well before removal so that you know which wire went where and so that you can reinstall the old thermostat as it was if something goes wrong with the new installation.

For heat pump systems you WILL have to make some programming changes to the thermostat to get it to work with a heat pump system. Most all thermostats come programmed for conventional systems. This reprogramming is not difficult but is required for proper operation.

http://www.fixya.com/support/r3623083-thermostat_wiring_terminal_designations

http://www.fixya.com/support/r3892721-programmable_honeywell

http://www.fixya.com/support/r3894275-manual_honeywell_find_honeywell_manuals

on Jan 16, 2010 | Heating & Cooling

1 Answer

Intertherm Heat Pump


Some of the old heat pumps made the reversing valve in the heating mode. On your new thermostat the orange wire will need to be on the B terminal. If it was color coded? I hope you made notes of how it was.

Jan 05, 2010 | Heating & Cooling

1 Answer

Need to wire a honeywell RTH7400D thermostat to 3 wire hot water


Just mark the old wires on the old thermnostat...R , W etc...and put them on the same terminals on the new 1.....also there should be some adjustment ire : switch on the back or under the cover to adjust for Hot water heating or electric heat...either is the setting you should have it on....also you shouldn't setback the thermostat at night or when away very much....2 degrees is fine , as the boiler will run along time to raise the temperature in the morning and may not get there by the set time

Oct 18, 2009 | Honeywell Electronic Programmable...

1 Answer

Outside unit runs continuously, even when system is off.


On A/C units, there is a low voltage line that leads to a contactor, which engages to close the high voltage circuit to the condensor unit. Over time, the accual contacts in the contactor can weld themselves together. Try shutting off your furnace breaker but leaving on the one for the outside condensor unit. If it still runs, your contactor probably needs replaced. Contact a licensed electrician or HVAC contractor and tell them you think your contactor is in need of replacement. Is a fairly simple and quick replace, but the contactor itself is not cheap.

Oct 10, 2009 | Ruud Central System Air Conditioner

1 Answer

Honeywell Thermostat RTH7400D


The thermostat will not cut off the A/C until the thermometer reading gets to 76.

If there is not a heat source near/behind the thermostat which is causing the thermometer to read higher than actual room temperature, it sounds like the thermostat thermometer is out of calibration.

There are ways to calibrate it, but much to involved to go into here.

One solution is to just set the thermostat at 80, knowing that it's really set on 76.

Another solution is to replace the thermostat.

Charlie

Aug 14, 2009 | Honeywell CT87B ROUND HEATING&COOLING...

1 Answer

After RTH6400 installation heat strip is no longer actuated


http://yourhome.honeywell.com/Consumer/Cultures/en-US/Products/Thermostats/Do-It-Yourself/Programmable/5-1-1/Default.htm look at the very last part of thius page and you will see that the particular thermostat does not work for heat pumps tha have auxillary heat. Sorry for being the bearer of bad news but you need to upgrade the selection to make it work right.

Jan 24, 2009 | Honeywell Electronic Programmable...

3 Answers

Switching thermostat from farenheit to celsius


My thermostat was set on celsius and couldn't get it to change back to fahrenheit. My son suggested pressing both up and down arrow buttons at the same time and it worked. It changed back to fahrenheit.

Feb 16, 2008 | Honeywell Programmable Thermostat Heater

1 Answer

Installing a honeywell CM900 wireless programmable thermostat


the analog unit uses just two wires for heat. red - white. there is a heat anticipator setting that must match the burner current. check your programmable specs and follow instructions.

Dec 04, 2007 | Honeywell Programmable Thermostat Heater

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