Garage furnace

[Tom7227]

I have an 80% efficiency furnace in the garage and a honeywell electronic thermostat. Just now it registered LO and the furnace would not turn on. I warmed it with a hair dryer and it fired up. Is that set up so that a high efficiency furnace wouldn't start with a frozen condensate line?

[Whoaru99]

Maybe just the batteries are really low from the cold?

[cavalierowner]

I agree, replace the batteries as the first thing to try. I have always heard you should replace batteries every year.

[Tom7227]

Batteries are brand new.

[Surface Tension]

I'd say low battery as well. Take a warm set of batteries and and try it.

A problem with frozen condense line, one of the vacuum to switch lines, heat exchanger, or just ice somewhere in the furnace would show up in the start up sequence or interrupt the run cycle.

IMO the inducer/exhaust motor would at least turn on. Then again it might have tried and failed then went into lock. A reset by turning the power off then on would be needed. There was a discussion about condensing furnaces used for heating on a non continuous use and freezing.

[fasterthanyou]

It's cause u haVe it to cold I've never seen a stat do that in my twenty years in heating what kind of stat is it. U can buy a non programable Honeywell stat at menards and u will never have trouble again

[randerson]

Its too cold in the garage your stat is not ment to read that low ditch the digital stat for a manual one and problem solved

[BoxMN]

Mercury old fashioned t-stat and mount it NOT level I can keep it down to 38 with no prob, though that is on the 50 degree setting

[JohnMickish]

They do make thermostats that are designed to operate down to about 40 degrees, the perfect thing for garages and they're not very expensive.