Lennox G32 SERIES - User Manual

Other manuals for Lennox G32 SERIES

Unit Information56 pages

Questions and Answers

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bkennedyAug 14, 2025
How to fix Lennox G32 control signaling low flame sense?
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  Robert CarpenterAug 14, 2025
  If your Lennox Furnace control signals low flame sense during heating mode, it could be due to the sense rod. Check the sense rod for proper location on the burner. If it's not correctly positioned, relocate it or replace it if necessary. Also, inspect the sense rod for contamination or a coated surface. Clean the sense rod with steel wool or replace the sensor, avoiding sandpaper to prevent further contamination.
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James FloresAug 18, 2025
How to troubleshoot Lennox G32 that fails to operate in cooling, heating, or continuous fan mode?
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  Troy OliverAug 18, 2025
  If your Lennox Furnace fails to operate in cooling, heating, or continuous fan mode, several issues could be the cause. First, check if the unit is receiving the correct 120V main voltage and address any power failures. Inspect the furnace wiring and connections for accuracy, paying attention to both the 120V supply and the 24V control board connections. Also, examine the circuit breaker; replace it if it resets without continuity, and investigate any shorts if it continues to trip. Ensure the door interlock switch is properly activated when the door is closed, verifying its continuity and connections. Check the transformer output to ensure it is at 24V, replacing it if necessary. Finally, if all other components check out, consider replacing the control board.
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fryjamesAug 21, 2025
What to do if Lennox G32 fails to fire, but combustion air blower and ignitor are energized?
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  Tracy MorrisAug 21, 2025
  If your Lennox Furnace fails to fire in heating mode, but the combustion air blower energizes and the ignitor is energized, start by verifying that gas is being supplied to the unit. Check the line pressure at the gas valve, ensuring it does not exceed 13" WC for both natural and propane, and that it reads a minimum of 4.5" WC for natural gas and 8.0" WC for propane. Inspect the gas valve wiring and multi-pin control amp plugs for correct connections. If these are in order, check if the gas valve is malfunctioning. Confirm that 24V is supplied to the gas valve approximately 35 seconds after initiating heat demand. If voltage is present but the valve doesn't open, replace the valve (after checking gas line pressure). If 24V is not supplied, replace the control board.
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Brent MorrisAug 25, 2025
Why Lennox G32 burners light but unit shuts down prematurely?
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  Jessica SimsAug 25, 2025
  If your Lennox Furnace burners light with a heating demand but the unit shuts down prematurely, consider these potential causes: * Verify that the correct concentric vent kit is used for terminating the unit. Use a 1-1/2" diameter concentric vent (kit60G77) for 50 and 75 inputs and a 2" diameter concentric vent (kit 33K97) for 100 &125 inputs. * Inspect the condensate drain line for proper vent slope and any blockages. Ensure condensate flows freely during furnace operation. Repair or replace any improperly installed condensate lines. * Check for restricted vent inlet or exhaust that could cause low pressure differential at the pressure switch. Remove any blockages and check for proper vent sizing.
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Kimberly WoodsAug 27, 2025
Why Lennox G32 Furnace fails to fire and combustion air blower doesn't energize?
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  dawn83Aug 27, 2025
  If your Lennox Furnace fails to fire in heating mode and the combustion air blower does not energize, a likely cause is an open primary, secondary (if equipped), or rollout limit switch. Check the continuity across these switches, noting that they reset automatically upon cooldown, except for the rollout switch, which must be manually reset. Inspect the blower inlet air (including the filter) and outlet air for any restrictions. Determine what caused the limit switch to activate before returning the unit to operation. Also, inspect the furnace wiring and connections at the limit switches for any miswiring or loose connections; correct or replace as necessary.
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careymargaretSep 3, 2025
Why Lennox G32 Furnace combustion air blower remains energized on initial power up?
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  Christopher HoSep 3, 2025
  If on initial power-up, the combustion air blower of your Lennox Furnace remains energized, first ensure that the unit is properly grounded by installing a main ground. Then, check the 6-pin connector for proper installation on the circuit board, ensuring it is correctly inserted into the control. Finally, verify that the line voltage is above 75V, and if not, determine the cause of the voltage drop and supply the correct voltage to the control.
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Sierra HobbsSep 6, 2025
What to do if Lennox G32 Furnace combustion air blower does not energize on start?
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  Jessica MatthewsSep 6, 2025
  If on initial power-up, the combustion air blower of your Lennox Furnace does not energize, first check that the 120V main power polarity is correct, ensuring the line and neutral are correctly input into the control; reverse them at the 120V field connection if necessary. Next, check for 120V to the combustion air blower; if there's no power, inspect the wire and connections. If power is present at the blower, then the blower may have failed and needs replacement.
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jensenkathrynSep 10, 2025
Why Lennox Furnace won't fire and combustion air blower doesn't energize (cont.)?
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  Tammie MooreSep 10, 2025
  If your Lennox Furnace fails to fire in heating mode, and the combustion air blower does not energize, check for correct wiring and secure connections to the combustion air blower. Correct any miswiring and replace loose connections. Also, verify that the pressure switch is open when the combustion air blower is not operating; replace it if it is stuck closed.
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Beth MillerDec 1, 2025
What to do if Lennox G32 won't fire, blower works, but ignitor is not energized?
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  James WhiteDec 1, 2025
  If your Lennox Furnace fails to fire in heating mode, the combustion air blower energizes, but the ignitor is not energized, the issue might stem from the pressure switch. First, ensure that the pressure switch tubing is correctly routed. Next, check for and remove any obstructions in the pressure tubing or taps. Inspect the pressure switch tubing for damage and replace any broken sections. Also, check for condensate in the pressure switch tubing and remove it, ensuring the condensate tubing is properly located. Verify that the differential pressure across the pressure switch exceeds the set point listed on the switch, checking for any restrictions in the inlet and exhaust vent. Ensure the correct pressure switch is installed and calibrated. Finally, check the wiring and connections at the...