Test AC volts on
connector T
(Blue wire to Ground)
1 – 100 AC Volts
YES
Remove & reinsert T.
Operate unit again.
IF code 13 appears:
Replace control board.
NO
Cycle unit ON; while in
maintenance mode, check
flame rod status under table
0Y. IF flame rod(s) is
detecting flame, maintenance
mode will display: 05
YES
Unit is operating correctly.
Burner and/or manifold
needed to be cleaned.
CHECK the area around the
air intake for the possible
cause of dirty manifold and/
or burner.
Flame rod(s) test OK.
Remove and clean the
manifold assembly and
burner assembly (How to
Remove: Sections 4 & 5).
Reassemble and operate
unit again.
Did Error Code - 13 appear?
YES
Clean flame rod(s). Operate
unit again. IF still does not
detect flame:
Replace flame rod(s).
NO
CHECK GAS SUPPLY,
VENTING, & GROUND.