Lennox International Inc Comprehensive Lennox Boiler GWB8 Manual for Troubleshooting and Control Module Operations
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APPENDIX A - CONTROL MODULE

Table 7 - Troubleshooting Error Codes

Error

 

 

Code

Definition

Consequence

Number

 

 

4

Flame current too low. Check for flame.

Non critical alarm

6

Flame sensed out of normal sequence (before opening or after closing gas valve).

Soft lockout

18

Gas valve relays welded. Five consecutive soft lockouts.

Hard lockout

23

Flame sensed during prepurge ( before gas valve signaled opened).

Soft lockout

32

Sensor 1 error. Temperature sensor in well is not reading correctly.

Wait for recovery

Verify it is connected to board. Replace if necessary.

 

 

55

Atmospheric damper end switch failed to close (end switch contacts stuck open).

Wait for recovery

56

Atmospheric damper end switch failed to open (end switch contacts stuck close).

Wait for recovery

57

Igniter flame rod shorted to burner ground

Wait for recovery

 

 

 

58

Igniter flame rod shorted to burner ground. Repair or replace igniter.

Wait for recovery

59

Line Voltage error - voltage out of specification high or low (15-37V (44-66Hz))

Wait for recovery

 

Applies only to thermostats having on-board transformer.

 

60

Polarity is wrong in this case.

Wait for recovery

 

Thermostat input higher than threshold.

 

61

Line voltage unstable - possibly too may heavy loads switching on and off causing

Wait for recovery

erratic supply voltage.

 

 

 

 

 

62

Soft lockout: maximum number of retries exceeded.

Soft lockout

Soft lockout is reset after one hour if alarm reason disappears.

 

 

63

Soft lockout: maximum number of recycles exceeded.

Soft lockout

64

Soft Lockout - electronics failure. On-board self diagnostics detected error.

Soft lockout

65

Over temperature error. Sensor measured temperature in excess of maximum

Soft lockout

allowable limit.

 

 

Note: Soft lockout time is 1 hour or manual reset. Hard lockout requires manual reset.

A.9 Intermittent Pilot

Ignition System Checks

STEP 1: Check ignition cable.

•Verify ignition cable does not touch metal surfaces.

•Verify only factory supplied Ignition cable (or approved replacement) is used.

•Verify connections to ignition module and igniter or igniter-sensor are clean and tight.

•Verify ignition cable provides good electrical continuity.

STEP 2:

Verify ignition system grounding. Nuisance shutdowns are often caused poor or erratic grounding.

Common ground is required for module and pilot burner/ igniter sensor.

—Check for good metal-to-metal contact between pilot burner bracket and the main burner.

—Check ground lead from GND (BURNER) terminal on module to pilot burner. Verify connections are clean and tight. If wire is damaged or deteriorated, replace with No. 14-18 gauge, moisture-resistant, thermoplastic insulated wire with 105°C [221°F] minimum rating.

—Check ceramic flame rod insulator for cracks or evidence of exposure to extreme heat, which can permit leakage to ground. Replace pilot burner/igniter sensor and provide shield if necessary.

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Contents Product Literature GAS-FIRED HOT Water BoilersInch DimensionsDimensions Boiler Model Number Flue Diameter WidthBoiler Ratings and Capacities Ratings and CapacitiesBoilers for USE AT High Altitude Table of Contents Installation Procedure Minimum Clearances to CombustibleVentilation & Combustion AIR Minimum Room Volume, Indoor Air OnlyRoom Cubic Feet Volume CanadaCheck local Connecting Supply and Return PipingRelief Valve Discharge Line DischargeTemperature Pressure Gauge For USE with Cooling UnitsTypical Hot Water Piping Bypass Piping Circulator on Supply Check Your Chimney Connecting The Vent Damper And Vent ConnectorChimney and Vent Pipe Connection Chimney SizingMinimum Vent Pipe Clearance Removing Existing Boiler From Common Venting SystemVent Damper Installation Vent Damper Manual OperationCheck GAS Supply GAS Supply PipingGas Pipe Sizes Checking GAS PipingElectric Power Supply Electrical WiringVent Damper Wiring Thermostat InstallationWiring Diagrams Integrated High Limit Electronic Ignition ControlWiring Diagrams Integrated High Limit Electronic Ignition Control General Instructions Filling System with WaterDo not use this appliance if any part has Lighting InstructionsLight this burner by hand To Turn OFF GAS to ApplianceOperating Your Boiler Check Thermostat Operation Maintaining Your Boiler Possible Cause What to do Service HintsIf Your System is not Heating or not Giving Enough Heat If Burner is NoisyEquipment and Optional Accessories Rollout Switch Flame Rollout Safety Shutoff Blocked Vent Safety Switch Blocked Vent Safety ShutoffAppendix a Control Module Installation Environment ConsiderationsAdjusting Settings Electrical ConnectionsOperation Operation State CodesBoiler High Limit Temperature Controller TroubleshootingTroubleshooting Error Codes Intermittent Pilot ErrorDefinition StepTroubleshooting Pilot Flame Correct Pilot Flame 3/8 to 1/2 inch in flame. See ,Lennox Industries Inc. Dallas, Texas
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