Product Troubleshooting

THREE FLASHES - TROUBLESHOOTING CODES
• Open in the safety switch circuit (limit switch or flame roll out
switch is open)
• The limit switch is ignored unless a call for heat is present (R to
W energized). If the limit switch is open and a call for heat is
present, the control de-energizes the gas valve, runs the blower
motor, and runs the power exhauster. The control will flash “3”
on the LED until the limit switch closes. When the switch re-
closes or the call for heat is lost, the control runs the power
exhauster through post-purge and runs the blower through the
fan off delay. The control will return to normal operation after the
blower off delay is completed.
• Possible Causes
Back Start Over