Hi

I have a Tempstar 7000 NUGK0175DG09 about 14 years old, split system gas furnace / AC

I turned the furnace on for first time - everything seemed fine and had heat

Heat then turned off, and blower continued to run. Tried replacing thermostat to no avail.

Now, even if thermostat switch is off (with either old or new thermostat) blower runs constantly and never get heat. I have to either turn breaker off or remove lower panel to stop blower

Any help / ideas would be greatly appreciated

Seems a safety might be open and that control board will keep the fan on.at least until you reset the power.

Read the faq section for the answer.