Posted: 12/6/2011 8:39:13 PM EDT
| I just walked into my house and noticed it was colder than it should have been. The temp was reading 65 degrees but it was set for 71 when I left the house this afternoon. I flipped the switch off then back on and I heard the furnace start up downstairs. I put my hand over several vents but there was no air coming out then the furnace shut down a few minutes later. Is this a problem with the blower motor or something else? What would repair costs average? The house was built in 2006 so I thought it would have lasted longer. |
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possible bad starting capacitor in the blower moter. Try starting by hand I have no idea how to do that. I did pull the filter and it was not clogged up and it was put in about 3 to 4 weeks ago. Call the repairman. That capacitor could give you a nasty jolt if it's charged up. |
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.9bar chance its the hot surface ignitor Could very well be. I have never had a problem on my home unit, but my big hydronics at work have HSI failures quite often ETA, OP, does your furnace have a LED code flasher on it? I have no idea I will go down and take a look. What exactly am I looking for? |
| If your hot surface ignitor, assuming you have gas, may be bad see if it glows when the thermostat is turned on, its located by the burners, you must have the burners going first before the blower comes on, if it doesnt the igntion moudle may lockout, to reset it by turnning the power off then on. IF your HSI, ignitor is bad it usually has a crack in, they are very brittle. Most common problem with gas furnaces. That is probably why your blower doesnt turn on because of no heat. |
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Had that same problem on m 90% Luxaire. Mine would click on than off every 3 to 5 minutes but no air movement. It was the vacuum hose FROM the blower motor to the furnace. Turned the furnace off at the furnace and the thermostat. I disconnected the hose from the blower and blew through it. It had a clog or something. It hits a switch in the furnace itself. When you blow through it youll here it click. I reconnected the hose and turned it back on and no problem since. Happened to me 3 weeks ago. Mine was not the ignitor. It was not cracked
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.9bar chance its the hot surface ignitor Could very well be. I have never had a problem on my home unit, but my big hydronics at work have HSI failures quite often ETA, OP, does your furnace have a LED code flasher on it? I have no idea I will go down and take a look. What exactly am I looking for? A flashing LED. Usually it flashes a code sequence and there is a code description somewhere on the panel. If your furnace is equiped with one, it will make troubleshooting real easy. Usuaully though, if there is a code fault, it will lock out everything until reset. The fact that your furnace tries to go through start up sequence makes me think you probably don't have a code flasher. |
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Had to fix my furnace several times. Igniter is most common problem. Should glow white hot. should be able to see it if you find out where it's at. Second most likely
problem is the control module. If the igniter doesn't glow measure the 115 volts to it. There is probably a wiring diagram on the furnace cover. No 115 volts is probably the control module. If the igniter glows but the gas never comes on again the module. |
| If the burners ignite and run for a few minutes then shut off and the blower never comes on it is probably the blower motor. It may just be the capacitor, but it is more likely the blower. Sounds like it is shutting down due to a temperature limit opening. If you hane the option on your thermostat try just turning the fan on. |
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.9bar chance its the hot surface ignitor Could very well be. I have never had a problem on my home unit, but my big hydronics at work have HSI failures quite often ETA, OP, does your furnace have a LED code flasher on it? I have no idea I will go down and take a look. What exactly am I looking for? A flashing LED. Usually it flashes a code sequence and there is a code description somewhere on the panel. If your furnace is equiped with one, it will make troubleshooting real easy. Meh, I'm having problems with mine and the LED flashes the GTG code. Worthless. Seem to have narrowed it down the main CPU unit that controls ignition and such. Loose board or something. Temp fixes include zip ties and tape. |
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I had this problem yesterday with my furnace and after reading the error code, I found that the drain off the flue vent trap was plugged and that water/condensation in the "combustion air inducer" was interfering with the furnace start up sequence.
I unclogged the line and now the furnace runs just fine. |
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.9bar chance its the hot surface ignitor Could very well be. I have never had a problem on my home unit, but my big hydronics at work have HSI failures quite often ETA, OP, does your furnace have a LED code flasher on it? I have no idea I will go down and take a look. What exactly am I looking for? A flashing LED. Usually it flashes a code sequence and there is a code description somewhere on the panel. If your furnace is equiped with one, it will make troubleshooting real easy. Meh, I'm having problems with mine and the LED flashes the GTG code. Worthless. Seem to have narrowed it down the main CPU unit that controls ignition and such. Loose board or something. Temp fixes include zip ties and tape. I have found the ones I encouter to be probably 90% accurate. There is an old woman down the road who runs the piss out of her furnace. I'm probably down there once or twice each winter looking at it. Thank goodness she has a code flasher. |
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If the burners ignite and run for a few minutes then shut off and the blower never comes on it is probably the blower motor. It may just be the capacitor, but it is more likely the blower. Sounds like it is shutting down due to a temperature limit opening. If you hane the option on your thermostat try just turning the fan on. This is the simplest thing to try. Ste the fan control on your thermostat from auto to on. The blower motor should come on and blow air through the vents. If it doesn't there's your problem. If it does you have other issues. My gas furnace has a self test on startup. There is a vent blower that check for an obstruction. If there is it will not allow the furnace to start. Jim |
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If the burners ignite and run for a few minutes then shut off and the blower never comes on it is probably the blower motor. It may just be the capacitor, but it is more likely the blower. Sounds like it is shutting down due to a temperature limit opening. If you hane the option on your thermostat try just turning the fan on. This is the simplest thing to try. Ste the fan control on your thermostat from auto to on. The blower motor should come on and blow air through the vents. If it doesn't there's your problem. If it does you have other issues. My gas furnace has a self test on startup. There is a vent blower that check for an obstruction. If there is it will not allow the furnace to start. Jim I just turned the furnace back on then switched the setting from auto to on. Air started coming out of all the vents but it is cool and not warm at all. |
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It's good to know the cycle of your HVAC to help you find where the issue is.
I have a goodman unit made in the early 90's and the hot surface ignitor has gone out a few times (this last one has lasted at 3 years now, knock on wood) and I knew this because I studied the cycles of the unit. If your unit is like mine and you say "the unit starts up but no air blows" that tells me that your exhaust fan is starting but the gas isn't lighting so the actual air blower never kicks in. GL |
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If you can identify the ignitor, and have a BBQ lighter you could get some heat tonite http://i44.tinypic.com/nmfhfl.jpg I really dont want to blow myself up tonight and think I can tough it out till morning. 
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