Lennox International Inc G61MP Condition Possible Cause Corrective Action / Comments, LED#1−Off

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IX−SURELIGHT® CONTROL TROUBLESHOOTING CHART

UPON INITIAL POWER UP, REMOVE ALL THERMOSTAT DEMANDS TO THE UNIT

PROBLEM: 1 UNIT FAILS TO OPERATE IN THE COOLING, HEATING, OR CONTINUOUS FAN MODE

Condition

Possible Cause

Corrective Action / Comments

 

 

 

1.1

1.1.1

ACTION 1 − Check 120V main voltage.

− Both diagnostic lights fail to light up.

Main voltage 120V not supplied to unit.

Determine cause of main power failure.

 

 

 

LED#1−Off

1.1.2

ACTION 1 − Check for correct wiring of 120V to

 

LED#2−Off

Miswiring of furnace or improper con-

power make up box and transformer.

 

nections.

ACTION 2 − Check 24V wiring to control board.

 

 

 

 

 

 

1.1.3

ACTION 1 − Replace fuse.

 

Blown fuse

ACTION 2 − If fuse still blows, check for short.

 

 

 

 

 

 

 

ACTION 1 − Check that door switch is activated

 

1.1.4

when door is closed.

 

ACTION 2 − Check wire connections to switch, re-

 

Door interlock switch failure.

place loose connectors.

 

ACTION 3 − Check continuity of switch in closed

 

 

 

 

position. Replace if defective.

 

 

 

 

1.1.5

ACTION 1 − Check that transformer output is

 

Transformer Failure.

24V. Replace if defective.

 

 

 

 

 

 

1.1.6

ACTION 1 − If all the above items have been

 

 

 

Failed control board.

checked, replace board.

 

 

 

 

 

1.2

1.2.1

ACTION 1 − Manually reset the roll−out switch

 

by pushing the top button.

− Diagnostic lights flash the roll−out

Roll−out switch open.

ACTION 2 − Determine the cause of the roll−out

 

switch activation before leaving furnace.

code.

 

 

 

 

1.2.2

ACTION 1 − Check continuity across roll−out

 

Roll−out switch failure.

switch. Replace roll−out switch if switch is reset

 

but does not have continuity.

LED#1−On,

 

 

1.2.3

 

LED#2−Slow Flash

 

Miswiring or improper connections at

ACTION 1 − Check wiring connections to switch.

 

 

roll−out switch.

 

 

 

 

 

1.2.4

ACTION 1 − Check 9−pin connector for proper

 

connection to control board.

 

9 pin connector failure

ACTION 2 − Check continuity of the multi plug

 

pin.

 

 

 

 

 

1.3

 

 

− On initial power−up the comb. air in-

 

 

ducer does not energize.

 

ACTION 1 − Check the 120V has line and neutral

− Diagnostic lights flash the reverse

1.3.1

correctly input into control.

polarity code.

120V main power polarity reversed.

ACTION 2 − Reverse the line and neutral at the

 

 

120V field connection.

 

 

LED#1−Fast Flash,

 

 

LED#2−Slow Flash.

 

 

 

 

 

1.4

1.4.1

 

− On initial power up the combustion

ACTION 1 − Check for 120V to combustion air

 

air inducer does not energize.

Open combustion air inducer motor

inducer. If no power, check wire and connec-

− Diagnostic lights flash normal power

circuit.

tions.

 

on operation.

 

 

 

1.4.2

ACTION 1 − If power is present at blower, replace

LED#1−Slow Flash

Failed combustion air inducer motor.

blower.

LED#2−Slow Flash

 

 

 

 

 

 

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Contents Table of Contents G61MPSpecifications Optional Accessories − Must be Ordered ExtraAfue Direct Vent Blower Data G61MP−36B−045 Performance Less Filter1495 2340 1285 1385 2410 Glass Assembly G61MP Parts ArrangementTOP CAP Sight BlowerDoor Interlock Switch S51 Circuit Breaker CB8−Control Box Control Transformer T1 Integrated Control Board A92Page TWO−STAGE Integrated Control Board Integrated Control Board Terminals 120VAC Neutral120VAC Line Integrated Control Board 5 Pin Terminal−Blower Compartment Blower Motor B3 and Capacitor C4 Secondary Limit Controls S21DS1 DS2 Description Supply AIR Blower−Heating Components Flame Sensor IgnitorBurners Figure Ignitor Bracket Burners Front View Burners TOP ViewFlame Rollout Switches S47 Combustion Air Inducer Prove Switch S18Clamshell Heat Exchanger Primary Limit Control S10Dual Combustion AIR Prove Switch CAI & Cold END Header BOX AssemblyFirst stage Negative Pressure Second stage Positive Combustion Air Inducer B6 II−PLACEMENT and Installation Outdoor Termination Kits and Corresponding Equivalencies−Vent Piping Guidelines −PVC Joint Cementing Procedure Minimum Vent Pipe LengthsMaximum Vent Pipe Lengths − Venting Practices Upflow or Downflow Direct or NON-DIRECT Vent ApplicationsTypical Exhaust Pipe Connections Direct Vent applications where combustion air is taken From indoors and flue gases are discharged outdoorsReducer Plug ReducerCarbon Monoxide Poisoning Hazard Sweep ELLPage − G61MP Vent Termination − AIR Inlet of Other Appliance Exhaust Pipe Termination Size Reduction Front View Side ViewUsing Existing Chimney ANGLE−CUT in Direction G61MP Direct Vent ApplicationG61MP NON−DIRECT Vent Application Using Existing Chimney Condensate PipingSide View NON−DIRECT Vent Wall Ring Termination Condensate Assembly Vent Nipple TEE Screw Coupling CLEAN−OUT AccessHose clamp −RINGS CAP HI/LO ScrewsFor Your Safety Read Before Operating −Preliminary and Seasonal Checks−Heating Start-Up −Safety or Emergency Shutdown IV−HEATING System Service Checks A−C.S.A. Certification−Testing Gas Piping −Extended Period Shutdown−Testing Gas Supply Pressure −Check Manifold Pressure− Proper Gas Flow Approximate − Proper Combustion− High Altitude − Condensate pH Range−Flame Signal −Temperature Rise−External Static Pressure VI−MAINTENANCE −Blower Speed TapsPage Page VII− Wiring and Sequence of Operation Sequence of Operation On Next Heating Sequence of Operation See BOX a LOW Flame Signal YES Normal Operation DS1 and DS2 Simultaneous Slow Flash YESEN or Heat Demand is SATISFIED. a Five Cooling Sequence of Operation Continuous LOW Speed FAN Sequence of Operation VIII− Field Wiring Applications and Jumper Settings SingleTWO Cool Transformer− Both diagnostic lights fail to light up LED#2−Off Miswiring of furnace or improper conDoor interlock switch failure − Diagnostic lights flash the roll−outUous fan demand Primary, secondary or backup secon − Diagnostic lights flash the limit failure modeLED#1−Slow Flash Miswiring of furnace or improper Connections at limit switchesSwitch failure code 2.5 minutes after LED#1−Off Prove switch lines damagedCondensate in prove switch line Prove switch does not close due to aTerminating the unit − Diagnostic lights flash the pressure Switch codeWith a heating demand Installed − After 5 tries the control diagnostics− Roll−out switch trips during − Diagnostic lights flash roll−out failFails to stay lit Operation. Problem is characterized − Combustion air inducer energizesMode Er motor Nostic lights flash low flame sense BurnerLED#1−Slow Flash Sensor rod is contaminatedService Notes

G61MP specifications

Lennox International Inc. has long been a leader in HVAC solutions, and the G61MP gas furnace exemplifies the company's commitment to innovation and energy efficiency. This high-efficiency gas furnace operates with an Annual Fuel Utilization Efficiency (AFUE) of up to 96%, allowing homeowners to save significantly on energy costs while maintaining a comfortable indoor environment.

One of the primary features of the G61MP is its modulating gas valve. This technology enables the furnace to operate at multiple levels of heating output, ensuring that it can adjust its performance according to the home’s heating demands. By modulating the heating output, the G61MP maximizes efficiency and minimizes energy waste, providing a consistent temperature and improved comfort.

The G61MP also incorporates advanced two-stage heating, which enhances its performance by reducing temperature fluctuations in the home. This feature is especially beneficial during transitional weather periods when heating needs may vary widely. With its ability to operate on a lower stage most of the time, the furnace can produce quieter operation and reduced energy consumption.

In terms of design, the G61MP includes a sealed combustion chamber that draws air from outside the home for combustion, enhancing safety and efficiency. This design feature eliminates the need for indoor air, improving indoor air quality. The furnace is also equipped with a high-efficiency ECM blower motor that not only boosts comfort but operates quietly and uses less electricity compared to traditional motors.

Further enhancing its efficiency, the G61MP utilizes a variable-speed blower, which allows for precise control of airflow throughout the home. This results in better humidity control and improved air distribution, providing an overall more comfortable environment.

The Lennox G61MP is compatible with the iComfort S30 smart thermostat, allowing homeowners to control their heating remotely, adjust settings based on their schedules, and access energy usage data. This connectivity transforms the G61MP into an integral part of a smart home ecosystem, facilitating energy conservation and comfort optimization.

Lastly, the G61MP is designed with durability in mind. Its robust construction and high-quality materials ensure reliable performance and lengthy service life. Homeowners can feel assured that they are investing in a heating solution that will meet their needs for many winters to come. In summary, the Lennox G61MP gas furnace stands out with its high efficiency, advanced technology, and user-friendly features, making it a top choice for homeowners seeking exceptional heating performance.
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