Question about Honeywell Programmable Thermostat Heater

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Only the boiler is hooked up to the RTH221. The Rh terminal is connnected to the Rc terminal with a jumper wire. It is a very tight fit to get the boiler wire in that terminal with the jumper wire already there. The boiler wire has already slipped out of the terminal. Do I really need that jumper wire in there and/or is there a work around to be certain the boiler wire will stay connected? thanks

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If you are only controlling heat with the thermostat you can remove the jumper and hook the boiler to RH.

Posted on May 16, 2010

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1 Answer

I have 4 wires green blue red and white my red is connected to the rh rc with jumper green connect to g blue to y1 and white is connected to w1 my new thermostat has no rc rh or a jumper


Paulette, if your new thermostat has no Rc and Rh thats fine. The Red wire should simply go to the R terminal. The Rc and Rh terminals on the old one was for the old 'two transformer' systems. The vast majority of systems now have no need for the Rc Rh terminal and jumper. The rest of your wires connect as on the old stat also.

Jul 31, 2015 | Heating & Cooling

1 Answer

I am wiring a Honeywell wifi unit and I used a separate 24v transformer and connected to the c and rc terminal. My system is ac and heat and uses both and rc and rh wire. I wired the rc to the r ter


A thermostat is a switch. It connects 24vac from one terminal to another depending on the request. The 24vac comes from a transformer, usually located in the furnace and connects to the R terminal. Since you are using RH and RC without a jumper between it means there are two transformers, one in the furnace for heating (RH) and one in the air conditioner condenser used for cooling (RC).
Your old thermostat was probably mechanical and did not have a C (24vac common) terminal. Your new thermostat requires power to operate therefore needs a wire connected to a C terminal. I would get rid of the transformer you added and look for an unused wire in the bunch at the thermostat. If it's there connect it to C on the thermostat and to C on the furnace. Remove any jumper from R to RC or from RH to RC depending on your thermostat and connect wires same as the old thermostat.

Jul 04, 2014 | Heating & Cooling

2 Answers

I paid $20 last night to talk to someone. He told me how to hook up the Lux DMH110 but when i hooked it up this morning the heater came on when i put it on COOL and the fan just come on when i put it on...


If you have this type of system your thermostat will not work;
  • Multi-Stage Heat Pumps
  • 3 Wire Hydronic Systems
  • Line Voltage Systems (120/240 VAC)

  • This thermostat is only for this type of HVAC systems;
  • Most 24V Heating and A/C Systems
  • 1 Stage Heat/1 Stage Cool: Gas, Oil, Electric, or Single Stage Heat Pump Systems
  • 2 Wire Heat Only Hydronic Systems (Hot Water Baseboard & Radiator)
  • Millivolt Systems (Wall Heaters / Furnaces & Gas Fireplaces)

    1. Never connect a low voltage thermostat to line voltage.
    Two wires control a heat only system.
    1. Connect one wire to W and the other to RH.
    Two wires control a cool only system.
    1. Connect one wire to RC and the other to Y.
    Three wires for forced air heat only system, where the previous thermostat
    did not have a clock or timer.
    1. The previous RH or RC wire is the 24-volt transformer wire. Connect it to RH. Leave jumper connecting RH to RC. Connect the forced air heat system to W, and the fan wire to G.
    Three wires for a heat only, forced
    water system that did NOT have a
    clock or timer.
    1. This system employ 3 wire zone valves. Currently no Lux controls are compatible with this system.
    Three wires control a heat only, forced water system that DID have a clock or timer.
    1. Tape off and do NOT install any clock or timer wire. Often they are labeled C or TC. Install the remaining two wires, one to RH and the other to W.
    Four wires control a heat only system,
    and two of the wires operate clock or timer. The other two wires operate the heater.
    1. Tape off and do NOT install any clock or timer wire. Often they are labeled C or TC. Install the remaining two wires, one to RH and the other to W. The jumper connecting RH to RC may remain or be removed.
    Two wires control heating AND cooling.
    1. Currently no Lux controls are compatible with this system.
    Three wires control heating and cooling. One wire operates heat, one operates cooling and the third provides 24 VAC.
    1. Connect the 24-volt power wire to RH. Install a jumper connecting RH to RC. This jumper is usually pre-wired. connect the heat wire to W, and the cooling wire to Y.
    Three wires control a cooling only system. One wire operates the compressor, one operates the fan and the third provides
    24 VAC.
    1. Connect the 24-volt power wire to RC. Connect the cooling wire to Y and the fan wire to G.
    Four wires control a heating and cooling, electric, gas or oil, forced air system that
    is NOT a heat pump.
    1. Connect the 24 VAC transformer wire to RH or RC. Install a jumper connecting RH to RC This jumper is often prewired. Connect the heat wire to W, the cooling wire to Y. and the fan wire to G.
    Four wires control a Single Stage Heat Pump. They were labeled: G, Y, R or
    RH or RC, With either B or was used.
    1. Do not connect wires to both B and O. Connect the reversing valve wire to B or O, just as the previous thermostat. Install a jumper wire from RH to RC. Connect 24 VAC wire to RH too. Install a second jumper wire from W to Y. Connect compressor wire to Y and the fan wire to G.
    More than 4 wires are connected to the
    old thermostat

    Jun 27, 2010 | Heating & Cooling

    2 Answers

    I am installing honywell thermostat rth111/rth221 old thermostat only has two wires red and yellow new thermostat has terminals marked Y,G,Rh and Rc with jumper,W. where do I connect red wire and also the...


    The red does go to RC, but the yellow should go to the W terminal, in HVAC W=heat Y=Cool, so aslong as the same wire is on RC on the t-stat, and RC on the unit, and same wire to the W on the t-stat as to W on the unit it should work!

    Jan 31, 2010 | Honeywell Programmable Thermostat Heater

    1 Answer

    Installation manual (pg. 6-7)states - "Remove Jumper if you have both R and RC wires" I only have the 'red'. But with the jumper in the way I can't get the red wire into the 4th terminal. So should I...


    No keep the jumper, you should be able to get the red wire in under the little peice of mettal that the jumper is under but just on the other side of the screw, The red wire can go on either the Rh or the Rc terminal along with the jumper. If all else fails just put a wire under Rh and another wire under Rc and then wire nut the red Rh and Rc wires all together.

    Nov 15, 2009 | Honeywell Programmable Thermostat Heater

    1 Answer

    I have a travel trailer with a roof top a/c colman mach111 and I hooked up a thermostate digital. The heat works but cant get a/c to come on. the termanials on hunter thermostate are G W Y RC RH


    OK, the wiring that you should have in your RV is as follows: Red White Blue Yellow Green Gray.

    This Thermostat will not work on this Air conditioner because the tstat you are installing is a 24V thermostat. The connections are as follows G = Fan, W = White, Y = Cooling, RC = 24V Cool, RH = 24V. The only thing that I can think to do is hook it up like so.

    On the G Terminal, Hook up the Green wire from the wall. On W, hook up the White wire, Y, hook up the yellow wire. RC = run a jumper from the RH terminal, RH = hook up the red wire. If this doesn't work then you will have to go back with the coleman thermostat.

    Jul 03, 2009 | Heating & Cooling

    1 Answer

    My problem is....On my new Honeywell RTH230B thermostat the color code is Rh, Rc, W,Y and G. My wire colors are red, orange, blue, white and black. I can obviously match up 4 of them but where the heck...


    First you are using abnormal wire colors for a furnace. Second.... if you have an air conditioner hooked up to this furnace, you will need to install a jumper wire between rh & rc. I am assuming this is a natural gas furnace. Usually the red wire to R terminals. Usaully the white wire to the W terminal. Take the door off of the furnace. Find the thermostat wire connection in the furnace. What ever color wire is on the R terminal in the furnace should hook to the R terminal on the t/stat. Whatever color is on the W in the furnace goes on the W on the t/stat. Whatever color is on the G terminal in the furnace goes to G on the t/stat. And the Y in the furnace to the Y on the stat. and the G in the furnace to the G on the stat. Most applications use only the R, W, G, & Y ( always put the jumper wire between Rh & Rc)
    Good Luck
    Hvac Teacher

    Mar 26, 2009 | Honeywell Programmable Thermostat Heater

    1 Answer

    I have an old janitrol thermostat with terminals marked R,Y,G,O,W2 and I want to replace it with a Hunter 44360 Programmable Thermostat with terminals marked G,RC,RH,Y/O,W/B,Y1 What wires do I hook up to...


    Hook up like this:
    R-RC (jumper rc with rh) unless you have more than one transformer
    Y-Y/O
    G-G
    O-Y/O (depending if reversing is energized by O or B terminal, refer to your manual)
    W2-WB

    Dec 06, 2008 | Heating & Cooling

    2 Answers

    Wiring a thermostat


    your red wire will go to the R, RC, or RH terminal on the stat does'nt matter which one ,this is the wire that provides 24 volt from the furnace. the white wire will connect to the W terminal on the stat. If there is a jumper wire that came on the stat going from RC to RH leave it on.

    Mar 08, 2008 | Honeywell Electronic Programmable...

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