Troubleshoot

THREE FLASHES - TROUBLESHOOTING CODES
• Open in the safety switch circuit (limit switch or flame roll out
switch is open).
• Unit sequence:
• Green Light on, call for heat. Power exhauster cycles on.
• Fan Motor Cycles on. Green light starts three flashes.
• Possible cause:
• Open or short in safety circuit (flame roll out switches some and
some limit switches are manual reset).
– Check for open contacts on switch in safety circuit. Reset flame roll
out switches and manual reset limit switches
– Check wiring. Wire off limit or flame rollout switch. Limit or flame
rollout switch shorting to unit. Defective limit or flame rollout switch.
Verify and replace if required.
• Defective board, not letting 24 VAC through limits.
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