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19.5
DIAGNOSTIC CODES FOR STATUS LED
IOM
IOM
Red LED (AN1) indicates following codes:
LED OFF
LED ON
1 Flash
2 Flashes
3 Flashes
4 Flashes
5 Flashes
6 Flashes
7 Flashes
8 Flashes
9 Flashes
10 Flashes
A green LED (AN2) is provided to indicate high heat state
LED OFF
LED ON
LED Flashing High heat demand, high pressure switch not closed
19.6
FAULT CODE HISTORY
The control stores the last 5 fault codes in memory. When the push button switch is pressed, the
control will fl ash the stored fault codes when the switch is released. The most recent fault code is
fl ashed fi rst, the oldest last.
Fault history may be cleared by holding the push button switch for more than 5 seconds.
19.7
INTERNAL LIGHTING SYSTEM
This series is equipped with internal LED service lights. One is located in the upper vestibule and the
other is located in the lower blower vestibule. These lights are only activated when the bottom door
is removed and the door switch is deactivated.The purpose of the interior lighting is to ease servicing
the unit.
W415-2306 / C / 09.22.20
STATUS
LED
No power to control or control hardware fault detected
Normal operation
High limit switch open
Pressure switch open with inducer on
Pressure switch closed with inducer off
Control in 1 hour lockout
L1/Neutral Polarity problem
Too many limit trips within one call for heat
Pressure switch cycle lockout
Lockout due to too many fl ame dropouts
Not used
Flame present with gas valve off
No demand for high heat
High heat demand, operating normally
FAULT CONDITION
H23.4.2B
H23.5
H23.6.1A
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