Integrated Control Diagnostic Codes - Lennox MERIT ML193DF Installation Instructions Manual

LED
PUSH BUTTON
TWIN
BLOWER OFF
DELAY JUMPER

Integrated Control Diagnostic Codes

DIAGNOSTIC CODES
LED Status
No power to control or control harware
LED Off
fault detected.
LED On
Normal operation.
Flame present with gas vavle
1 Flash
de−energized.
Pressure switch closed with combustion
2 Flashes
air inducer de−energized.
Pressure switch open with combus-
3 Flashes
tion air inducer energized.
Primary limit switch open.
4 Flashes
Rollout switch open.
5 Flashes
Pressure switch cycle lockout.
6 Flashes
Lockout, burners fail to light.
7 Flashes
Lockout, buners lost flame too many
8 Flashes
times.
9 Flashes Line voltage polarity incorrect.
INTEGRATED CONTROL
(Automatic Hot Surface Ignition System)
FIGURE 58
DESCRIPTION
TERMINAL DESIGNATIONS
Humidifier (120VAC)
HUM
Input (120VAC)
LINE
Transformer (120VAC)
XFMR
Indoor Air Qality Accessory Air Cleaner (120VAC)
EAC
Blower − Cooling Speed (120VAC)
COOL
Blower − Heating Speed (120VAC)
HEAT
Dead terminals to park alternate spd taps
PARK
Continuous blower
CONT
Neutral terminals (120VAC)
NEUTRALS
Twinning Terminal (24VAC)
TWIN
Note − This control is equipped with a push button switch for
diagnostic code recall. The control stores the last 5 fault
codes in non−volatile memory. The most recent fault code is
flashed first, the oldest fault code is flashed last. There is a
2 second pause between codes. When the push button
switch is pressed for less than 5 seconds, the control will
flash the stored fault codes when the switch is released.
The fault code history may be cleared by pressing the push
button switch for more than 5 seconds.
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