I am installing a Honeywell, RTH230B.

My connections are:
R to Rh (red jumper to Rc that came with the unit)
W to W
Y to Y
G to G
B to nothing

The fan comes on (when set to "on").

When set to auto (and program the temperature way up or way down), the heating/cooling/fan do not respond.

I have tried the J2 Jumper at both settings, just in case, with no change.

Is the unit bad or am I doing something wrong?

Connect R and W at the thermostat, did the furnace start?

Of course, you posted right after I re-connected the old one... I won't be able to try again until tomorrow afternoon. If I connect R and W, and the furnace doesn't start, what does that mean? If it does, what does that mean?

Thanks!

It means you have a problem most likely in the furnace. If it doesn't work by jumping them at the stat, try it on R + W @ the furnace if it then starts you have a bad stat wire. Please becarefull around electricity. Note: there should be a safety door switch on the blower compartment that must be depressed for the furnace to operate.

I came home to work on this, and read your post. I don't think there could be a problem with the furnace or the wires, because the old thermostat works. If I have it wired correctly, it must be the new thermostat.

My old thermostat is wired:
R-R
G-G
Y-Y
W-W
B-empty
O-empty.

There is a blue wire from the wall, which was not connected to the old and I did not connect to the new. There is not an orange wire. I posted the connections I made on the new thermostat previously.

If there's something else I could try (other than buying a new thermostat), please let me know.

You wired it correctly from what you have said. It is either a bad stat or the furnace has a problem. Did you try to connect r-w at the stat?

I haven't done that, because I know it's not the furnace. Now, however, I realize what you mean by "stat wire" (I was thinking that was a name for one of the wires, not part of the thermostat.). I'll try now.

Good luck

Okay--I get nothing. But without the green connected can the fan run at all? Or should I be looking instead of listening?

R to G will turn on the blower. R to W will start the heating process. Are to Y will turn on the outdoor A/C. The fan is controlled by the furnace for heat, not the thermostat. The G wire does control the fan in most furnaces for A/C though.

I wrote to Honeywell about the problem, and am posting their response:

Based on the information you have provided, the RTH230B is wired correctly. Please make sure the J2 jumper is set to the HG position (default position). If the heating does not come on, please follow the steps given below:



· Put the system switch to heat and the fan switch to auto.

· Make sure the heating set point is higher then the room temperature.

· The thermostat will make a call for heat indicated by the flame icon in the display. When the flame icon appears in the display, the heating should come on.

· The wires connected to the thermostat should be tight and secure.

· The furnace door should be tightly shut.

· Make sure the power switch at the heating equipment is on. Reset the circuit breakers.



If the flame icon in the display is steady, it is advisable to have the voltage going into the thermostat checked through a licensed HVAC contractor. The RTH230B needs a steady voltage of 24 to 30 VAC to operate.