Brian Connolly

12:24PM | 02/26/03
Member Since: 02/25/03
2 lifetime posts
Here's a new one. I've searched hundreds of messages in the archives and haven't found it, and it's driving me crazy.

I have a Carrier gas furnace, new in 1991, and a ***** digital programmable thermostat.

On very cold nights only (when the temps dip into the teens and below), the temps in the house will fall right through the "on" setting, not triggering the furnace. We have it set to come on at 65 degrees, and we wake up and it's 59!

This only happens when it's very cold outside, including during the day. During less severe times, it works fine, day and night.

Any ideas? Had an HVAC tech over, and he did about $300 of repairs (new home warranty), but the problem remains.


Brian Connolly

04:40PM | 02/26/03
Member Since: 02/25/03
2 lifetime posts
Good questions, thanks.

I left out one important observation from the original message. All it takes to get the furnace to turn on in this situation is to manually lower the thermostat setting until it passes below the actual current temperature reading. At that point, there is an audible click, which I believe is the thermostat telling the furnace to turn off (which doesn't make sense, since it never turned on in the first like it should have). Then all I have to do is hit "Run Program" or raise the thermostat setting above the current room temp and the furnace will fire up like normal.

So, for some bizarre reason, when the temps inside the house drop quickly, the thermostat gets fooled. During milder weather, there's never a problem.


12:38PM | 11/28/03
Member Since: 11/27/03
6 lifetime posts
I assume that you have a Honeywell programmable tstat. Your problem is that it is an older model which does not have intelligent recovery. Meaning, that during the day you have it set at say 68, at night when you go to bed you have it set back to say 60 at 11 pm with it programmed to come on at 6 am for 68. What happens is that when you go to bed the stat shuts the furnace down until it reaches the setback temp [ +/- 2 degrees ] at 6 am the stat tells the furnace to come on and heat up to 68. Without intelligent recovery, the stat comes tells the furnace to come on at 6am, not to be at 68 at 6 am. The newer Honeywell models have the intelligent recovery feature which in your case would tell the make the house 68 at 6 am by cycling the furnace on/off throughout the niight to make it was 68 at 6am.


Post a reply as Anonymous

Photo must be in JPG, GIF or PNG format and less than 5MB.


type the code from the image


Post_new_button or Login_button

Few projects are more fun than upcycling a vintage piece in a surprising way. Outfitted with a sink and a delicately tiled... Built on a rocky island in the Drina River, near the town of Bajina Basta, Serbia, this wooden house was cobbled together ... Large steel-framed windows flood the interior of this remodeled Michigan barn with daylight. The owners hired Northworks A... Edging formed with upside-down wine bottles is a refreshing change. Cleverly and artistically involving recycled materials... A Washington State couple called on BC&J Architects to transform their 400-square-foot boathouse into a hub for family bea... Similar to the elevated utensil concept, hanging your pots and pans from a ceiling-mounted rack keeps them nearby and easy... For windows, doors, and mirrors that could use a little definition, the Naples Etched Glass Border adds a decorative flora... The thyme growing between these stepping stones adds a heady fragrance to strolls along this lush, low-maintenance garden ... Decoupage is an easy way to add any paper design to your switch plate, whether it is wallpaper, scrapbook paper, book page... Twine lanterns add pops of crafty—but sophisticated—flair to any outdoor setting. Wrap glue-soaked twine around a balloon ... When securely fastened to a tree or the ceiling of a porch, a pallet and some cushioning make the ideal place to lounge. V... Reluctant to throw away any of those unidentified keys in your junk drawer? Hang them from a few chains attached to a simp... A stripped-down model, sans screened porch, starts out at $79,000. Add the porch, a heated floor for the bath, and all the... Salvaged boards in varying widths and colors make up the dramatic accent wall in this attic space. The high-gloss white of... This garden shed has been decked out to the nines. Designer Orla Kiely created the intimate home for a flower trade show, ...
Newsletter_icon Google_plus Facebook Twitter Pinterest Youtube Rss_icon