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Home Repair (alt.home.repair) For all homeowners and DIYers with many experienced tradesmen. Solve your toughest home fix-it problems. |
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#1
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Furnace running with thermostat off
Hello all, I have a problem with my gas furnace. Last night my furnace
would not stop running even after the desired temperature had been reached. I finial decided to turn it off from the thermostat and still the furnace stayed on. I finally had to trip the breaker to turn it off. I have been looking around online and a relay could be poss. cause. Any help would be appreciated. Thanks |
#2
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Furnace running with thermostat off
On Dec 28, 9:36�pm, fzbuilder wrote:
Hello all, I have a problem with my gas furnace. Last night my furnace would not stop running even after the desired temperature had been reached. I finial decided to turn it off from the thermostat and still the furnace stayed on. I finally had to trip the breaker to turn it off. I have been looking around online and a relay could be poss. cause. Any help would be appreciated. Thanks furnaces always run for awhile after thermostat says heat off to cool down the heat exchanger. how long did yours run? |
#3
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Furnace running with thermostat off
On Dec 28, 9:36*pm, fzbuilder wrote:
Hello all, I have a problem with my gas furnace. Last night my furnace would not stop running even after the desired temperature had been reached. I finial decided to turn it off from the thermostat and still the furnace stayed on. I finally had to trip the breaker to turn it off. I have been looking around online and a relay could be poss. cause. Any help would be appreciated. Thanks Could be stuck relay on control board. If you have an older furnace, the fan could be controlled by a temp probe inside the duct. It looks basically like a dial that turns as the temp goes up or down. Another possibility is your T-stat is defective, Remove the wires from your T-stat and see if the fan goes off. |
#4
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Furnace running with thermostat off
Will not stop running at all even with thermostat to off. I have to
hit the breaker. It will run all night if I don't |
#5
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Furnace running with thermostat off
is the fan switch on "on" instead of auto?
s "fzbuilder" wrote in message ... Will not stop running at all even with thermostat to off. I have to hit the breaker. It will run all night if I don't |
#6
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Furnace running with thermostat off
Furnace is a Lennox GH6D if that helps.
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#7
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Furnace running with thermostat off
auto
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#8
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Furnace running with thermostat off
On Dec 28, 9:37*pm, fzbuilder wrote:
Will not stop running at all even with thermostat to off. I have to hit the breaker. It will run all night if I don't Is it the blower that runs, or are you generating heat and the blower is running. If the blower continues to run when the temperature of the blowing air is cool, then the sensor that shuts off the blower is defective. On older furnaces, as a previous poster said, there is a temperature sensor that has ordinary metallic contacts that sometimes stick. If you whack the side of the furnace and the blower stops, it is probably sticking contacts. Newer themostats have electronic controls that I don't know much about because I have an older fuirnace. |
#9
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Furnace running with thermostat off
It is making heat. I have the thermostat to off and then flip back on
the breaker and furnace is at full heat. |
#10
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Furnace running with thermostat off
Heat and blower run
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#11
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Furnace running with thermostat off
"fzbuilder" wrote in message ... Hello all, I have a problem with my gas furnace. Last night my furnace would not stop running even after the desired temperature had been reached. I finial decided to turn it off from the thermostat and still the furnace stayed on. I finally had to trip the breaker to turn it off. I have been looking around online and a relay could be poss. cause. Any help would be appreciated. Thanks When mine did that a year ago, it was a bad thermostat. It thought it was cooler than what it read. They replaced it and it's been fine ever since. The whole unit was only 3 yrs old. Kathy |
#12
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Furnace running with thermostat off
fzbuilder wrote:
Will not stop running at all even with thermostat to off. I have to hit the breaker. It will run all night if I don't Hi, Relay stuck or newer ones have control board with relay on it. You did not mention furnace make and model. |
#13
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Furnace running with thermostat off
Furnace is a Lennox GH6D if that helps.
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#14
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Furnace running with thermostat off
fzbuilder wrote:
Furnace is a Lennox GH6D if that helps. Well it is now Monday so try contacting Lennox? Lou |
#15
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Furnace running with thermostat off
fzbuilder wrote:
It is making heat. I have the thermostat to off and then flip back on the breaker and furnace is at full heat. Maybe you've got a short in the wiring between the thermostat and the furnace. Mice that like to chew insulation will sometimes cause that. -- The e-mail address in our reply-to line is reversed in an attempt to minimize spam. Our true address is of the form . |
#16
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Furnace running with thermostat off
On Mon, 29 Dec 2008 20:11:58 -0600, CJT wrote:
fzbuilder wrote: It is making heat. I have the thermostat to off and then flip back on the breaker and furnace is at full heat. Maybe you've got a short in the wiring between the thermostat and the furnace. Mice that like to chew insulation will sometimes cause that. Yeah, instead of disconnecting the thermostat at its location, it should be disconnected at the furnace for testing. Usually not so hard to find the wires. They are, at least in my case, either the only small wires that go to the furnace/AC or the there is just them and the small wires to the AC outside. |
#17
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Furnace running with thermostat off
Sounds like sticky relay on the control board. I had a couple friends with
this problem. They had replaced the thermostat four times (no kidding). I went there on unrelaed matter, and found the house unoccupied and about 80 degrees. I asked why was the heat up so high..... Yes, I'm the fellow who actually repaired the problem. -- Christopher A. Young Learn more about Jesus www.lds.org .. "fzbuilder" wrote in message ... Will not stop running at all even with thermostat to off. I have to hit the breaker. It will run all night if I don't |
#18
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Furnace running with thermostat off
"Bubba" wrote in message ... On Sun, 28 Dec 2008 18:36:59 -0800 (PST), fzbuilder wrote: Hello all, I have a problem with my gas furnace. Last night my furnace would not stop running even after the desired temperature had been reached. I finial decided to turn it off from the thermostat and still the furnace stayed on. I finally had to trip the breaker to turn it off. I have been looking around online and a relay could be poss. cause. Any help would be appreciated. Thanks Since you've given no full model number and a very generic explaination it the same as saying this: I have a Buick. Sometimes in the morning it takes a while to start and then it keeps sputtering while its running. What could it be? Bubba Fuel line clog, or dirty air filter |
#19
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Furnace running with thermostat off
On Dec 30 2008, 5:47*am, "Stormin Mormon"
wrote: Sounds like sticky relay on the control board. I had a couple friends with this problem. They had replaced the thermostat four times (no kidding). I went there on unrelaed matter, and found the house unoccupied and about 80 degrees. I asked why was the heat up so high..... Not finding a control board on this unit. It is prob. 20 or more years old. The thermostat runs down to a small transformer on the wall with 2 wires. 1 red and 1 white. Then the white wire continues to another small transformer in the unit. This has the white wire on one side and a blue going to the pilot. I disconnected the white wire there and the pilot stopped come on but blower came on. Still stumped |
#20
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Furnace running with thermostat off
On Dec 30 2008, 5:47 am, "Stormin Mormon"
wrote: Sounds like sticky relay on the control board. I had a couple friends with this problem. They had replaced the thermostat four times (no kidding). I went there on unrelaed matter, and found the house unoccupied and about 80 degrees. I asked why was the heat up so high..... Not finding a control board on this unit. It is prob. 20 or more years old. The thermostat runs down to a small transformer on the wall with 2 wires. 1 red and 1 white. Then the white wire continues to another small transformer in the unit. This has the white wire on one side and a blue going to the pilot. I disconnected the white wire there and the pilot stopped come on but blower came on. Still stumped Probably an internal limit switch stuck. If so, this is a serious fire hazard. |
#21
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Furnace running with thermostat off
On Jan 4, 4:44*pm, "Twayne" wrote:
On Dec 30 2008, 5:47 am, "Stormin Mormon" wrote: Sounds like sticky relay on the control board. I had a couple friends with this problem. They had replaced the thermostat four times (no kidding). I went there on unrelaed matter, and found the house unoccupied and about 80 degrees. I asked why was the heat up so high..... Ok, found the control box and opened it up. It has blower control with a slider and a little knob and limit control box next to it. I taped on both a bit and moved the slider around. Now the heat will turn off when it reaches temperature, but the blower will run forever ever after it has cooled down. I have it set to auto. Could it be faulty blower control? Thanks |
#22
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Furnace running with thermostat off
replying to Stormin Mormon, larry chamberlain wrote:
How did you fix the problem -- for full context, visit https://www.homeownershub.com/mainte...ff-350432-.htm |
#23
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Furnace running with thermostat off
On Saturday, January 13, 2018 at 11:44:07 PM UTC-6, larry chamberlain wrote:
replying to Stormin Mormon, larry chamberlain wrote: How did you fix the problem -- You'll have to ask him when you get to Heaven. Chris died a few years ago while he was doing what he loved, troubleshooting HVAC equipment. He's been missed in the newsgroup. 8-( [8~{} Uncle Sad Monster |
#24
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Furnace running with thermostat off
On 1/14/2018 12:44 AM, larry chamberlain wrote:
replying to Stormin Mormon, larry chamberlain wrote: How did you fix the problem He went to the rooftop and sacrificed his life to fix it. The Mormon died about 2 years ago. |
#25
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Furnace running with thermostat off
On 1/14/2018 9:53 AM, Ed Pawlowski wrote:
On 1/14/2018 12:44 AM, larry chamberlain wrote: replying to Stormin Mormon, larry chamberlain wrote: How did you fix the problem He went to the rooftop and sacrificed his life to fix it. The Mormon died about 2 years ago. I recall but I don't know that we ever learned whether the problem was fixed or not... -- |
#26
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Furnace running with thermostat off
replying to fzbuilder, belleman wrote:
How did you resolve the problem? Ihave the same situation now? Thanks -- for full context, visit https://www.homeownershub.com/mainte...ff-350432-.htm |
#27
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Furnace running with thermostat off
On 05/05/2018 11:44 AM, belleman wrote:
replying to fzbuilder, belleman wrote: How did you resolve the problem? Ihave the same situation now? Thanks I moved the fan switch from "on" to "auto" |
#28
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Furnace running with thermostat off
replying to fzbuilder, Dave Nelson wrote:
Hello, I have the same problem as posted above. My Rheem furnace will try to start, for only 5 or 6 seconds even though my set point on the stat is correct, and even after I turn off the thermostat, in the off position. Dave Nelson -- for full context, visit https://www.homeownershub.com/mainte...ff-350432-.htm |
#29
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Furnace running with thermostat off
On Tuesday, May 21, 2019 at 2:44:06 PM UTC-4, Dave Nelson wrote:
replying to fzbuilder, Dave Nelson wrote: Hello, I have the same problem as posted above. My Rheem furnace will try to start, for only 5 or 6 seconds even though my set point on the stat is correct, and even after I turn off the thermostat, in the off position. Dave Nelson -- for full context, visit https://www.homeownershub.com/mainte...ff-350432-.htm What kind of thermostat? Battery type? Batteries fresh? Take the batteries out and see if it continues. If it doesn't put the batteries back in. If it still persists, time for a new thermostat. I recommend Honeywell VisionPro series. |
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