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

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Honeywell T882 Chronotherm Clock Thermostat needs replacement

What replacement thermostat by Honeywell will work. Four wires - two from transformer by electric box to thermostat then two wires from thermostat to furnance. Can't seem to find one to fit<

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The two wires from the transformer are to run the clock in the old thermostat. If you connect the two other wires to any heating thermostat, it will work. Don't forget to disconnect the transformer wires. Hope this helps

Posted on Jul 09, 2009

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Posted on Jan 02, 2017

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1 Answer

Upgrading to Honeywell wifi thermostat and it won't power up...help!!! Old thermostat was a Honeywell rh7400


If you accidentally touched the red wire to any other wires when you were changing the T/stat it's possible you blew a fuse for the 24 volt transformer on the outside unit. If you cant find a fuse, then the transformer needs to be replaced.

Nov 16, 2017 | Honeywell Heating & Cooling

1 Answer

Replacing chronotherm with new rth7600


R= power in G= fan Y= cooling W=heat O= heatpump reversing valve C= common used for clock on chronotherm Usually its pretty streight forward wire for wire. Unless you have a heatpump. The thermostat has to be heatpump compatable. And I ll usually use the 8000 for this. The w and y jumper may not be necesary on the new thermostat as the new one should do it internally once programed as a heatpump thremostat. At least thats how the 5000 and 8000 sreies work. So imagine the 7000 would be the same. You may also have to program the reversing valve operation not all manufactuers do it the same . Some valves have to be powered for heat while others have to be powered for cooling. Good luck

Jun 16, 2013 | Honeywell Programmable Thermostat Heater

1 Answer

Heating wont come on. honeywell system the request box in kitchen requesting for it to come on but thermostat not coming on and boiler in garage not kicking into action hve tried resetting both thermo


Check transformer near on on boiler circuit board. the transformer provides a low voltage power source to operate some thermostats and relays at the furnance control board. May need new transformer also check wiring to thermostat

Sep 25, 2017 | Honeywell Programmable Thermostat Heater

1 Answer

We have a chronotherm heating system written in dutch and we need to reset it because it turns on during the day and we cant turn the termperature down


Chronotherm was a Honeywell thermostat from the 70s-80s. Better off going to home depot and replacing it. Wiring is not that hard, they give you labels for the wires. It is low voltage and will not sting you, but turn off heating unit first to avoid shorting out transformer.

Sep 08, 2011 | Heating & Cooling

2 Answers

I have an Intertherm Thermostat. It was broken when a quilt rack fell from the wall. The wires were still attached, but we believe the thermostat was damaged, because the heat pump will not run at all,...


Yes they should be compatible, but you may have to jumper rc and rh on the new thermostat if you have not already. Also you may have blown the low voltage fuse of the Intetherm circuit board. It should be located in the electrical compartment of the unit. The fuse will be a blade type, 3 or 5 amp.

Jun 19, 2011 | Intertherm P3RA-048K Air Conditioner

1 Answer

How do you wire a honeywell round mechanical thermostat


What are you trying to wire up?
Typical Thermostat Wiring for 4 or 5 wire Heat/Cool Thermostat (not heat pumps)
4 Wire Termostat
R = Red One Side of 24 volt Transformer
G = Green Blower
Y = Yellow Cool
W = White Heat
5 Wire Thermostat
with one transformer for both units
Rc One Side of 24 volt Transformer
Rh Jumper Rc to Rh
G = Green Blower
Y = Yellow Cool
W = White Heat
5 Wire Thermostat
With 2 transformers one for indoor unit
And one for outdoor unit
Rc = Red One Side of (outside) 24 volt (outside transformer)
G = Green Blower (outside transformer)
Y = Yellow Cool (outside transformer)
Rh = Blue One side of (inside) 24 volt (inside transformer)
W = White Heat (inside transformer)
COOLING ONLY Thermostat
R = Red One Side of 24 volt Transformer
G = Green Blower
Y = Yellow Cool
HEATING ONLY
R or Rh One Side of 24 volt Transformer
W = White Heat

Feb 09, 2010 | Honeywell CT87B ROUND HEATING&COOLING...

2 Answers

I have a very old manual Chronotherm thermostat.


No. The clock is just the set back timer. Pull the battery and use the stat manually.

Jan 26, 2010 | Honeywell Electronic Programmable...

1 Answer

Old analog chronotherm - clock broken


Unfortunately, no. These clocks fail frequently.

Jan 12, 2010 | Honeywell Heating & Cooling

1 Answer

All electric new home. Bought honeywell programable thermostat RTH2308. A/C works but heat will not turn on. This model # is not on their web site.


check to make sure there is a jumper wire on the subase between "rc" and "rh". these designations stand for red/cooling and red/heating.they are used independently if the system has a separate control transformer for heating and a separate one for cooling. they need to be jumpered when one transformer is used to control both modes. your fan "on" switch won't work the fan continuosly if there is no connection to the "r/c" trminal.
on the back of the thermostat there should be a switch you need to select for gas or electric heat. or there are small micro switches that need to be set for your particular application.check your installation papers for details.
these thermostats usually cover a wide range of applications and need to be selected.

Dec 29, 2009 | Honeywell Programmable Thermostat Heater

1 Answer

I have a Honeywell Chronotherm III Thermostat and in instead of showing the temparature in the display it shows -AC. I've replaced the batteries, and tryied adjusting Temp up and down for cooling and...


It would appear to me that you have lost the 24 volt power supply to the thermostat. In referencing the manuals for this thermostat, available @ www.honeywell.com, I've found that when the thermostat is not connected to the wall plate (plate mounted on the wall, that the thermostat either snaps or screws into), it will display the -AC. This being said, either the thermostat is loose on the wall currently, or your 24 volt transformer has died. Hope this helps.

Dec 23, 2009 | Honeywell Power Humidifier: Furnace...

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