03:13PM | 10/31/10
Member Since: 10/30/10
2 lifetime posts
My furnace is 8 years old and was pit in by the previous owners. Last year it seemed to work fine. It's part of a central system and AC worked fine all summer. When i turned on the furnace this year it would heat about 2 degrees (so if it was 60 on the house and I wanted it at 66, at about 62) and then the furnace burner and fan shut off. The thermostat blinks HEAT and FAN, which it does when these were on. After some time, it would come on again. Eventually it will heat to the set temp.

I had a tech here to service and clean it. I also cleaned the air intake vent. He thought it needed more air (there is only one intake vent) because of the high pressure (this was before i cleaned it... it was a mess). Again, last year we did not have this issue. So it was suggested we need a new intake vent. He also thought the furnace was hitting the hi too quickly and that piece may be worn out. The other thought was to clean the coils, although the pressure on either side was fine.

So I'm wondering if the system worked 7 years, why would it need more air now? What else should I check or think about? Could it just be the limit switch that is tired? Any other reason this would happen?

Thanks for any help.


02:24AM | 11/01/10
Member Since: 07/22/04
530 lifetime posts
was that changed?

the tech should be able to determine if it's cycleing off on high limit. if not i would suspect the flame proving device.


07:15AM | 11/01/10
Member Since: 10/30/10
2 lifetime posts
The filter was changed when the tech looked at it (it was changed recently before that also). It is cycling off on high-limit, but his only thought was that it wasn't getting enough air (I've since cleaned out all the intake vents). Since it's running worse now, I'm wondering if some mech equip inside is failing, or if it's a gas issue? The gas lines on the property were replaced recently because they were leaking.


07:29AM | 11/01/10
Member Since: 07/22/04
530 lifetime posts
What was the mannometer reading on the gas valve tap?

Another thing could be a blocked evaporator coil or blocked or closed heating vents.


08:25AM | 11/01/10
Member Since: 07/22/04
530 lifetime posts
you said a tech was out but he was unable to resolve the issue.

is the fan belt(if it has one)wore out)

blower wheel cruded up?

cutting out on high limit but did he take an actual temp reading to see what point it was opening?


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

These stylish cabinets are a classier way to store laundry goods and give the room a sophisticated, polished look.  It turns out that many bath and kitchen cleansers contain chemicals that are dangerous to the skin and eyes, and often pro... So often we paint tiny nooks white to make them appear larger, but opting for a dark, dramatic wall color like this one—Be... Chocolate-colored walls and large window frames allow the exposed wood beams to take center stage in this small screened p... If you're not crazy about the idea of commingling plants and pool, this modern variation may be more to your liking. The s... Yes, a freestanding garage can become its own tiny house. Artist Michelle de la Vega has all the comforts of a modern resi... There’s nothing like a new set of cabinet hardware to refresh a room. The possibilities are endless: Go modern, rustic, or... Pursue what's known as the stack effect. To achieve it, open the windows on both the upper and lower floors, and as warm a... Like no other floor type, a checkerboard design works wonders to underscore the retro kitchen theme. Vinyl flooring, ceram... 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... Incorporate nature into your lighting scheme by securing a dead tree in a concrete mold and draping your pendant lamp from... For the cost of a can of exterior paint , you can totally transform your porch. Paint the floor a hue that complements yo... In this urban apartment, a standard-issue patio became a serene and green perch by replacing the typical concrete with gro... If you put the washing machine in the mudroom, you can stop the kids from walking through the house in dirty, grass-staine...
Newsletter_icon Google_plus Facebook Twitter Pinterest Youtube Rss_icon