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A.9 Intermittent Pilot
Ignition System Checks
STEP 1: Check ignition cable.
• Verify ignition cable does not make contact with 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.
APPENDIX A - CONTROL MODULE
30
STEP 2:
Verify ignition system grounding. Nuisance shutdowns are
often caused by 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.
— If flame rod or bracket is bent out of position, restore
to correct position.
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