Lennox International Inc GWB8-262E-2 APPENDIX A - CONTROL MODULE - Troubleshooting Error Codes

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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