Troubleshoot

SIX FLASHES - TROUBLESHOOTING CODES
• Open in the safety switch circuit (limit switch or flame
roll out switch is open). Main air mover CYCLES ON.
• Unit sequence:
• Green Light on, call for heat. Power exhauster cycles on.
• Fan Motor Cycles on. Green light starts six flashes.
• Possible cause:
• Open contacts due to over-firing of unit (flame roll out switches
some and some limit switches are manual reset).
– Check gas pressure. Check to make sure nothing is blocking airflow
out of unit.
– Wire off limit or flame rollout switch. Limit or flame rollout switch
shorting to unit. Defective limit or flame rollout switch.
• Defective board, not letting 24 VAC through limits.
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