The furnace will not turns on at "ON' mode. After some reading, I thought it would be the pilot light that has gone out. I re-lighted the pilot light to see blue-red flame, but the furnace will turn off AGAIN after 3-4 hrs. Replaced a new Honeywell non-programmable thermostat today with the following wirings:

Red wire to R
Black wire to Rc
Green wire to G
White wire to W
and
ORANGE WIRE TO Y!

From Honeywell's manual, it says not to connect any wire to O ( does O stands for orange?)
Is my wiring diagram correct from connecting the orange wire to Y?

The furnace would not operate when the fan is set to 'AUTO' mode for heat and cool. This is an ongoing problem and since we use A/C seldomly during the summer, the problem is never look after. Any helps are great.

Regards,

Eric

labman

I really would rather stay out of the way and let Northern Heat answer these. Do you want a quick answer or one you can count on? I used to answer the questions I could, but feel everybody should leave answers to the best people. But since you emailed me.

If the furnace wasn't running before you changed the thermostat, go to the furnace and connect the R and W terminal. If the furnace doesn't start up, the problem is in it, not the thermostat or its wiring. Maybe before doing that, check to see if you have 24 volts between them. If not, check the control board for a blown fuse. Then check the transformer. You must have power to the furnace, and 24 volts from the transformer. Once you are sure you have power and the furnace will run, then make switching the power at the thermostat work.


If the furnace takes off, let it warn up the house. I think straighter when I am not freezing. Post back.

letmetellu

I didn't understand your question completely. You say the furnace turns off in the on mode. What is the "On Mode." If you are talking about the fan switch on the thermostat the normal position for that switch is ON.
I am not sure about your wiring but it sounds wrong to me. First you need to see how the wires are connected to the furnace circuit board "Low voltage Strip"

The R terminal on the furnace should be connected to the Rh terminal on the thermostat.
A jumper wire should go from Rh to Rc in the thermostat.

The G terminal should connect to the G terminal on the thermostat.

The W terminal should connect to the W terminal on the thermostat.

The Y terminal should connect to the Y terminal on the thermostat.

That only leaves one wire left so you should just put a wire nut on it and not use it.

spanky28

For my problems, I am refereing to the fan switch on the thermostate. After many tries, the pilot light will not light up anymore.

letmetellu

I still don't know how you try to light your pilot

hvacmark

In regard to some simple thermostats look to see if you have bought one that you have to tell or should I say set and tell the unit what kind of vac unit you are controling.
some you have to tell it is it a heat pump or a split system gas fired unit. and the set it to the one you have. better have the book they can be a pain to set by trial and error.

regards mark

hvacmark

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