“why does my heating system blow cold air sometimes when on heat I have a th6400 series and sometimes it blows cold air. why”
Answer This Question
1-1 of 1 Answer
Hi, We recommned that you check the position of your fan switch and if it is on, move it to auto and retest. If it is a newly installed thermostat, verfiy your exisiting to new wiring matches. Thanks, Honeywell Support Team.
Sorry, there was a problem. Please try again later.