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  1. HVAC
    I have a Carrier MCB58 gas furnace and since about two weeks it started making a rattling sound when the heat stops (transition from heating to fan circulation only). The filter is new. The blower is clean. The sound seems to be coming from the inducer. Here's a video of the noise (noise...
  2. 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!
  3. HVAC
    Hi guys, I'm noticing that my house may be at a negative pressure. I've noticed backdraft from the fireplace, and seemingly colder than normal drafts from doors, etc. I'm wondering if this can be alleviated by increasing the air-intake from outside to the furnace. I have Lennox G51MP series...
  4. HVAC
    This is an interesting one. My Carrier gas furnace will run a complete heat cycle (thermostat set to 70, furnace will heat to 71, and then stop as expected). Right after it stops, the red LED on the circut board will turn off, making it appear that there is no power going to the circuit board...
  5. HVAC
    I have a 1973 double wide mobile home. I have a Bryant 80 series gas furnace. The past owner seems to have messed up and jerry-rigged the ducting. And I can't seem to find any manual etc. that answers my question. So I'm going to try my luck here: Mobile home furnaces have two heat duct...
  6. HVAC
    I have a Bryant 80 series gas furnace. I think it's from 1973. It's in a doublewide mobile home. The past owner must have destroyed the original round crossover furnace duct tubing. They put in it's place cheap foil type tubing (don't know what to call it) and it's like 8 inches which I...
  7. HVAC
    Hi everyone! I'm learning a lot about furnace repair this season. A week ago, I replaced the control board on my Goodman after the HVAC person said it was faulty. Instead of paying them $700 to replace it, I ordered the $50 part myself and it's been working great until today. The issue now is...
  8. HVAC
    Hello -- I'm a landlord and have this furnace (1988) in a rental home: SnyderGeneral furnace GUA080A016AIN (might be 12AIN, as someone has crossed off the 16 and written 12 in ink). It has stainless steel horizontal venting out basement wall. Inspector says all venting should be galvanized...
  9. 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...
  10. HVAC
    Hi, I am building a small cottage and hired a contrctor to do the duct work and install a dual stage furnace and an HRV. He has left the job unfinished with the furnace installed, the heat ducts almost complete, about 90%, but no air return or HRV. I can't get anyone to come and complete the...
  11. HVAC
    So, we finally got around to running new wire from the thermostat to the furnace. We're installing an Ecobee4, which requires a common wire, but we decided on running new 5-wire cable, just in case. Anyways, there's no labels on my furnace and we have no idea how to connect the new wiring. I...
  12. HVAC
    Hello, I have a Lennox G60UH series natural gas furnace that is acting up. In the mornings when it is scheduled to kick on the thermostat calls for heat but the furnace wont turn on until someone goes and turns the thermostat down then up again. After that it will turn on for a few minutes then...
  13. HVAC
    Hello, I hooked up a new thermostat which required the usage of a Common wire. Being the idiot that I am, I removed the whole house humidifier wiring (Honeywell HE120) from my furnace (Lennox Airflow 92AF1UHxyz) and didn't take a photo. <face palm>. Now I have five wires (two from the...
  14. HVAC
    Hello and happy new year! since coming back from vacation, my hvac is not blowing HOT air anymore. everything was working fine before. it's blowing air now, but just when we increase the temperature, it's not producing HOT air. the thermostats are OK (they're all new from sep 2018), and...
  15. HVAC
    I have a Maytag gas furnace (sorry, not sure of model, but its newer high efficiency kind) and its started short cycling. When the thermostat commands heat, the furnace draft fan will start, then the igniter comes on, then gas starts and flame is instant, but then the gas cuts off in 1-2...
  16. HVAC
    Hello There, I was hoping I could get an idea how some of you might handle this. A couple years ago my Carrier GX-042090301AD packaged HVAC rooftop unit stopped providing heat in the middle of winter. When I turned it on you could hear the unit try to start and then after a while when close by...
  17. HVAC
    My furnace is short cycling, where the gas supply and burners are running for about 30 seconds at start up. After the startup cycle they begin to turn on and off about every 15 seconds. While this is happening the blower motor and inducer exhaust fan do continue to run. ~ I have installed a new...
  18. HVAC
    I have a Goodman model gmt090-3a furnace. About a month ago when starting up the furnace for the first time for the season, it wouldn’t start. I replaced the blower motor, vent blower motor and the pressure switch. Everything worked fine..... until a week a week ago. Now when it starts up...
  19. 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...
  20. HVAC
    I have furnace that is currently controlled by a simple electronic thermostat on the fritz, and an evaporative cooler. I'd like to combine the control into a modern wifi thermostat, but I am lost with the wiring: The furnace is a simple 2-wire control. connect the wires and the furnace runs...
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