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  1. 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. HVAC
    When thermostat calls for AC, the motor starts (x13 motor) and stops every few seconds. The fan does start moving but the system doesn't fully start. The motor makes a slight noise (like something is shorting) then shuts off. A very quick look online seems to suggested replacing motor unit -...
  3. HVAC
    Please help me diagnose my furnace problems. Over the last 5 years my furnace has gone dead about half a dozen times and resurrected after a few hours. It’s happened twice in the last week. The 2 diagnostic LEDs are dead. I measured the voltage at the 24V transformer. It’s generating 27V just...
  4. HVAC
    I am getting a new thermostat for my Lennox furnace, replacing an old one. My question is: Can I place the hub and HD display units at 2 different locations way apart? (this model comes with a communicating hub and a HD display) Where is the actual temperature sensor built-in to sense the...
  5. HVAC
    Hi All, I have a Lennox 80MGF3/4-100A-1 with a White-Rodgers 36E36-278 Gas Valve. The furnace has been frequently going into WatchGuard mode since the burners fail to ignite. I cleaned the flame sensor and it functioned normally for a few weeks then started having the same issue. I would turn...
  6. HVAC
    The Unit won't turn on. I've check all fuses and circuits and there is power to the unit. The thermostat is new, it's a Honeywell T5 and is set for heating. The damper on the unit opens but nothing else happens, no fan, nothing. I set the fan to run mode on the thermostat and the fan did come...
  7. 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!
  8. HVAC
    I broke the drain spud on my HEIL manual power humidifier, so I decided to replace the whole thing with a new Aprilaire 700M (which looks to be the exact same unit). However when the Lennox iComfort tstat calls for humidity, the new Aprilaire is unresponsive. No solenoid or fan movement. I'm a...
  9. HVAC
    I just purchased a Honeywell HE280A Bypass Humidifier to add to my home. I currently have a Lennox SLP98V furnace with an iComfort Wi-Fi Thermostat. My furnace board does have a HUM connector and an available Neutral. I removed the plug-in transformer from the Humidifier, and instead wired...
  10. HVAC
    Hello All and thank you for any knowledge you might share... I am trouble shooting my Lennox G61MP. The control board is #100869-01 Nothing seems to be working with the furnace and I've checked continuity between thermostat and control board. It is paired with a Carrier AC and the compressor...
  11. 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...
  12. 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...
  13. HVAC
    My Aprilair 600m humidifier does not have its required 24V power. I have wired it as described on the Lennox SL280UHV furnace schematics (Humidifier to "C", other wire to HUM1 contact, HUM2 contact to "R"). I can not control humidity from my iConnect thermostat, but it does sense it. The best...
  14. HVAC
    I have 2 natural gas Lennox furnaces in my attic, Im at work but i think the model is G60UH(x)? The issue Im having is that the one furnace lately has begun to fail to light the gas so the watchdog stop is from attempting to spool up again. I can reset the thermostat by switching it to off wait...
  15. HVAC
    Hi, I am renting a house that has a 3 year (ish) old Lennox SL280UHV gas furnace that sometimes works and sometimes doesn't. I am the third renter so I have no idea if any maintenance has been done on it (and I highly doubt it has). My landlord/property manager creeps me out and I'm a single...
  16. HVAC
    I have a Lennox gas furnace G8D2 (produced in a long time ago) and I just purchased a new Wi-Fi thermostat Honeywell TRH 6580 WF 1006/W. The installation instruction says that wire C must be connected (to provide 20V power for the Wi-Fi thermostat, but the furnace does not have wire C (it only...
  17. HVAC
    Have a Lennox HP-036-7P. It cools great for about 10 minutes and then the compressor stops. When this happens everything else keeps running but the compressor. The LED's on the board are both flashing which per the manual means everything is ok. The condenser and evaporator coils are clean...
  18. HVAC
    Hi: I have a 5 year old Lennox Heat Pump, 2 stage compressor with 2 stage aux electric heat and a lennox/honeywell thermostat. Ever since it was installed I have noticed mostly in colder weather it cycles constantly. Often it will run for a few minutes, stop for a minute or less and then...
  19. HVAC
    I am having problems with my Lennox 80MGF furnace. The house blower runs and never shuts off. The fan switch at the thermostat is set to "auto." Diagnostic LED1 is flashing and LED2 is off. This implies that the flame detector is sensing flame while the gas valve is de-energized...
  20. HVAC
    I have a 17 year old Lennox whisper heat Furnace with a delayed ignition. There are three burners. When cold started, the pilot light will ignite, then the middle and left burner will ignite. The flame sensor and pilot is on the middle burner. The right burner will take an extra few seconds...
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