While viewing burner
chamber through sight glass:
In 10 second intervals, cycle
unit 3 times -
ON-OFF; ON-OFF; ON-OFF
Determine if flame is visible
when OFF.
YES
Follow maintenance mode
instructions at bottom of
page & continue to
diagnostics on next page.
NO
Visually inspect burner
chamber through sight glass
for foreign debris.
YES
Operate unit.
IF 80 – Error Code appears &
flame IS visible while unit has
been OFF longer than 5
seconds:
Replace gas control valve.
NO
Remove and clean
burner assembly
On remote control, go to maintenance mode 0Y table.
For maintenance mode instructions go to page 21.
All maintenance mode ‘0Y’ readings should be done
immediately after turning the unit OFF. IF flame rod(s) is
detecting flame, maintenance mode will display:
Indoor Units: 05
Outdoor Units: 01
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