Troubleshoot

FOUR FLASHES - TROUBLESHOOTING CODES
• In lockout from failed ignition or flame loss unit
SPARKS and SHUTS DOWN within 10 seconds
• Unit Sequence:
• Green Light on, call for heat
• Power exhauster cycles on, starts pre purge
• 24 VAC present through pressure switch, limits, and to
gas valve
• Igniter sparks, burner cycles on for 10 seconds, then
cycles off, no yellow flame light on board. Fan motor
never cycles on.
• Possible Causes
Back Start Over