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My thermostat is not working properly.I took off the plate, and connected the rh wire to the w wire, there is a spark, but heat still will not come on. should these wires both be connected to the rh screw? im sure ill have to replace thermostat, but with limited funds im trying to do with what i have to at least warm up the house. I have a ritetemp 8022c.

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The rh and w wires should not be on the same screw. That would make the heat run all the time because it would bypass the thermostat. It sounds like you had power on the rh wire which is the hot wire from the transformer. If you connected it to w and the heat still didn't come on then your problem isn't the thermostat. You should check the contactor or relay that makes the heat kick on. I don't know what type of system your thermostat is controlling so I can only give you limited advice on that.

Posted on Nov 15, 2010

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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.

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Trying to hook up Honeywell RTH6350 thermostat. When turned on cool out air blows out. We only have a green, red, yellow and white wire from the old unit. Are we missing some wires? we have a heat pump.


Your Thermostat should wire as Red to Rc/Rh (if Rc/Rh are not connected you need to put a jumper between them; White to W; Green to G; and Yellow to Y on your thermostat. These will be the only wire connections that you need to connect from the unit to the thermostat. However, if your thermostat is not battery operated and is programmable then you will have to run on wire form the transformer in the units C to the Bl on your thermostat.

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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;
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  • 3 Wire Hydronic Systems
  • Line Voltage Systems (120/240 VAC)

  • This thermostat is only for this type of HVAC systems;
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    Three wires for a heat only, forced
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    Three wires control a heat only, forced water system that DID have a clock or timer.
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    1 Answer

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

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