I just installed a new thermostat and the registers are not pushing out any air/heat. It appears they are pulling air in. Is this possible? I feel I connected the wiring correctly. However, I assume something is wrong there. Also, the copper tubing outside the furnace is starting to ice up. Never seen this before. I went from an old GE weathertron(mercury ampule)to a Honeywell RTH7400/7500.

Has yoiur furnace actually fired or can you tell if your AC compressor is running?

What type of system do you have. Is it a conventional forced air gas furnace with air conditioning (coil on top of furnace, and condenser outside). Or is it a heatpump. Sounds like something got hooked up wrong, but that would not cause the blower motor to reverse direction. Take a piece of toilet paper and hold it to the registers, and let me know if they are blowing or sucking.

I think I figured it out. I had the setting on the thermostat for the Heat pump changeover valve set to cooling instead of heating. I corrected it and it appears I'm getting heat as desired and no icing on the piping. Thanks for your speedy response.

I think I figured it out. I had the setting on the thermostat for the Heat pump changeover valve set to cooling instead of heating. I corrected it and it appears I'm getting heat as desired and no icing on the piping. Thanks for your speedy response.

Glad you got it working. Thanks for the update.