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  1. HVAC
    Hi looking for some technical help with our HVAC system. I just replaced the blower motor in our furnace and it is running constantly since the change. I’ve disconnected it from the thermostat to isolate the problem and it still fires up as soon as the power comes on and stays that way with or...
  2. HVAC
    I am working on a Trane /American Standard heat pump replacing the module and blower motor. Bought one on line, installed it and it runs but it spins in the wrong direction. I ordered the same one I took out, MOT09609, they also offered MOT9609. Is that for two different rotations? I am...
  3. HVAC
    My furnace is "short cycling" I believe. Typically the blower will turn on for about a minute and then shut off. After that I can hear the inducer motor running for a few minutes and then the blower kicks on for a normal amount of time to complete the cycle. There have been a couple of times...
  4. HVAC
    Hello, New to the site. I saw a post from Marty S. from 2010 where he suspects a cracked heat exchanger might be the cause of a blower motor not stopping. Does anyone know what about a cracked heat exchanger might prevent a blower motor from not turning off? Thanks!
  5. HVAC
    I have an old Sears Power Miser 80 Furnace and the fan blower won't turn on when the thermostat is set to "Fan Auto". The furnace ignites, the Fan Limit Control spins around while heating up and when it hits the fan notch, nothing happens. Eventually the furnace will reach the shut off notch and...
  6. HVAC
    I have a Lennox furnace, 80MFG3/4-100a-7 that needed a new blower motor. I purchased a US Motor LX7920 which was listed as a replacement. Also replaced the capacitor. All specs are consistent. The original motor had 3 leads, the common white, then high speed black attached to the ACB Cool...
  7. HVAC
    I have a Carrier Infinity unit. I replaced a White Rodgers thermostat with a Honeywell RTH6360. The wiring was cut and dry, but in my haste, I did not unplug the main unit power until later. I wired everything up and realized that I blew the 3 amp fuse. Replaced the fuse, AC comes on, but...
  8. HVAC
    I need help with blower motor for my AC. I can't find it online. I guess its old model and they don't make them anymore, or maybe I suck at web searching. Its EMERSON model K55HXJFN-2836 HP 1/4 Volts 115 HZ 60 AMP 5.9 RPM 1075/3 SPD. If theseone is not available, is there any adequate...
  9. HVAC
    We have an issue were we can hear and see that the furnace will turn on. The blower will not work, but the Blower works for the A/C. Not sure what the problem could be. We did change thermostat. I confirm that the wires were connected correctly and secure. Any other options. It is cold...
  10. HVAC
    I have a split unit that's trying it's very best to stay broken 365 days per year. The current issue, as described in the subject line, is that the blower motor runs all the time, even with the thermostat switch in the off position. The blower is in the air handler inside the house, and I...
  11. HVAC
    I have a Coleman DGAT gas furnace that the blower will turn on at various times in between heating/cooling cycles. Runs for a couple of minutes and shuts off. I have had this happen with the thermostat disconnected from the furnace. I replaced the pcb and bypassed the limit switches and it still...
  12. HVAC
    -The Story- I just bought a house with a brand new Goodman GMS80603AN earlier this year. I remember testing the furnace before closing and it was working fine. It finally got cold enough to where I wanted to kick the heat on today, but only to find out it doesn't work. -What Works- I have a...
  13. HVAC
    Hi. Last night I realized my AC stopped working. I turned the thermostat to 74 degrees and by the time I woke up the house temperature was 80 degrees. My home has a single Carrier compressor (obviously outside). The air handler, evaporator coil and blower are upstairs in the attic. I spent the...
  14. HVAC
    I noticed an electrical burning smell inside the house, went to the attic and noticed the AC blower trying to start, stopping then restarting every few seconds. I flipped off the wall switch cutting the power to the blower. Any help on what my next steps are, short of calling a repairman?
  15. HVAC
    I've been without AC for 5-6 days now, and I've been trying to figure out what the problem is. I have a Rheem Criterion with a 1012-925 IFC, Honeywell Chronotherm III The outside condenser and fan both work, with the motor heating up and the lines leading out from it heating up as well (checked...
  16. HVAC
    My home needs some heating help - see my previous post about my terrible hydronic heating system :-). I have a gas fireplace that vents horizontally out the side of the townhouse. Above it is a shelf for my DVD player, media PC, and then above that is where I have the TV. Problem is, if I turn...
  17. HVAC
    hvac puzzler-blower fan not working on "on" or "cool", but does on heat Would be grateful for any insight and assistance on this issue which started 3 days ago. I am going to try to be brief, but I might accidentally leave out an important detail. So please let me know if I do. Realized a/c was...
  18. HVAC
    I have a York about 10 yrs old. The a/c has been running fine since we turned it on a month ago. None of the settings or thermostat have been changed. Now the fan on the a/c unit outside works but the blower inside the furnace won't come on. No weird noises anywhere. There is 9 flashing lights...
  19. HVAC
    I have a Carrier (Model 80U-19A) furnace from the mid-1970s that is not working. When the thermostat turns on, normally the flames ignite and a short time later the blower kicks in. However, the flames are not igniting, now. The blower still kicks in after the usual wait period. It is a...
  20. HVAC
    Can any other HVAC contractors help me out? The gas furnace is making a terrible whirling, grinding noise. Any ideas? The blower was already replaced. I'll try to attach a video so you can hear it.
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