Troubleshoot

FOUR FLASHES - TROUBLESHOOTING CODES
• In lockout from failed ignition or flame loss unit
SPARKS but DOES NOT IGNITE
• Unit Sequence:
• Green light on: call for heat, 24 VAC at R & W terminals
• Power exhauster cycles on, start pre purge. 24 VAC
through pressure switch and limits.
• Igniter sparks, no ignition, no yellow flame sense light.
Will cycle 5 times in this manner, then Green light will
flash four times. Power exhauster will cycle off. Fan
motor will never cycle on.
• Possible Causes
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