Turn Power OFF.
Unplug unit and plug back in.
Turn Power ON.
While viewing through sight
glass, turn on water flow to
begin ignition sequence.
Is flame visible before igniter
sparks?
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 again.
IF 72 – Error Code appears &
flame IS visible before igniter
rod sparks:
Replace gas control valve.
NO
Remove & 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 ON. IF Flame Rod(s) is
detecting flame, maintenance mode will display:
Indoor Units: 05
Outdoor Units: 01
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