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  1. Lennox Blower Motor Back and Forth but no full power

    HVAC
    Hello, I have a Lennox Signature Model G61MPV-36C-090-09 furnace. I was noticing that it was not heating the house when it started to get cold. I turned it on and off at the breaker and observed that it would ignite and blow flame but the blower fan would only rock back and forth, never...
  2. Radiator - no heat

    HVAC
    I've got a 100-year-old, 3-story house with a gas boiler, 6 zones, and many radiators. Three on the second floor do not get hot. They probably are in the same zone, but honestly, it's hard to know where all the pipes go. The boiler is working. All Thermostats are working. Air in the radiators...
  3. Pressure Switch Stuck Open, Inducer Doesn't Start, Blower Motor Does Start

    HVAC
    Hey Gang, First time poster here. Went to fire up the heat for the first time this season yesterday, and after 30 minutes I noticed it had been blowing the whole time, but there was no heat. This is a model number GUI075A012AIN. Taking a closer look, I saw that I had three blinking lights...
  4. hvac not blowing hot air anymore

    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...
  5. Trane XR90 Pressure Switch Error - Help Diagnosing

    HVAC
    I have a Trane XR90 furnace that is periodically not igniting. I get a “pressure switch” error (three blinking lights). We have had the issue in the past, but after shutting down the furnace, waiting and turning it back on, it would work normally. This winter, the error has been much more...
  6. Circulator on gas hot water furnace not working

    HVAC
    I think I have a bad circulator. I have 120 volts going to it. The light for zone 2 is on so i knew the thermostat was sending the message. I check voltage at 120 past the relay going to the circulator and took the cover off the circulator and got 120 there too, but it's not sending the water...
  7. Burners do not stay lit.

    HVAC
    I have a Goodman GMT070-4A. When turning on the heat this year (I live in San Diego), there is no heat coming out of the vents. When turning the furnace on, the ignitor will glow, the burners will ignite then will run for about 6 seconds then shut down. This process repeats three times then the...
  8. Gas Furnace Blower Works, but no heat

    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...
  9. Air blows, but no heat, how to diagnose?

    HVAC
    The heat in my home does not work. It cools just fine, but when I turn on the heat, it doesn't do anything except blow air. I've had the unit since 2007, and the thermostat since 2011. Yes, I have it set for heat. Yes, I've checked the circuit breakers. Yes, I set the temperature for 5-10...
  10. Is my control board really defective?

    HVAC
    Hello folks, I recently had to replace the control board on my furnace. (N9MSB) The board I purchased is identical to the original. (OEM 1184594) I received it in a new, unopened condition. No physical defects to be seen.. So I swapped the board out and took it for a spin.. I ran it through a...
  11. Amana Gas Furnace no heat LED blinks 4 times

    HVAC
    So we are in the shoulder season here in Georgia where we jump from a little A/C in the daytime and occasionally have the need for heat at night. The other day we noticed that the air coming out of the vents with A/C on smelled a little musty. It was not not quite like dirty socks but not quite...
  12. Lennox 80UHG heat doesn't come on

    HVAC
    I have a Lennox 80UHG furnace that quit working yesterday. I can turn the blower fan on by switching the fan from "auto" to "on" but the heat will not kick on when the thermostat is set to "heat." I have the temperature set above ambiant room temperature but nothing happens. There are 2 green...
  13. No heat.... HELP!

    HVAC
    ok, was washing clothes and fuse blew, turned back on the fuse and everything came back on but the furnance.... any sugguestions *up the creek w/o a paddle*
  14. new furnace control board same problems?

    HVAC
    Hello guys and gals, I have an old york diamond 80 furnace that was not running when started the first time after the summer. voltage was being supplied where it was supposed to be, the call for heat was there, but it wouldn't even begin to turn the inducer motor. A couple times, when...
  15. Heat pump is not running on Heat mode

    HVAC
    Hi, we bought a house with a heat pump and an electrical furnace as auxiliary heat. Unfortunately this winter we noticed that only the furnace was working to heat the house. The temperature was a little bit warmer today so I decided to run a couple of tests on the heat pump (Carrier 38YXA) and...
  16. Glowing Ignitor, No gas- Goodman GMP050-3

    HVAC
    Our furnace stopped blowing heat a couple of days ago. Forgive my lack of terminology but here is the scenerio. 1. thermostat clicks 2. inductor? fan runs 3. ignitor glows for 5-7 seconds and then goes out. 4. no ignition, no flame, no heat= we're freezing our butts off. Easy to assume that...
  17. 1997 Heil Furnace randomely won't stay lit.

    HVAC
    I have a 1997 Heil Furnace. It will work fine for days even weeks and then randomly will not relight but the blower stays on until I shut off at the thermostat. I leave it off for about 10 minutes then turn it back to heat and it all works fine. Like I said it might work fine for a couple days...
  18. Carrier 58STA/58STX No Heat

    HVAC
    Tried to use the furnace for the first time this season and our furnace will not start (North Texas and damn good insulation). I am leaning towards the control board, but I will detail my troubleshooting and would appreciate any additional advice. The thermostat calls for heat, but I get a 31...
  19. trane TUE060 furnace won't start

    HVAC
    I was unable to find a similar problem in previous posts. I have a Trane TUE060 furnace. The furnace is not turning on when I set the temperature below the ambient temp. The AC functions properly and the blower fan runs when I switch to fan "on" mode (not heat mode). I'm getting an error...
  20. Heat Won't Come on After Installing New Thermostat

    HVAC
    I have replace my friends 1971 manual Honeywell thermostat on a Comformaker Model: GDE067AC12AN (1971) with a Hunter Touchscreen Programmable thermostat Model 44860 2 Stage Heat/2 Stage Cool. The A/C works however the heat does not come on. Four wires G,Y,W,RC & RH which are jumped. When I...
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