Ignition Control - Lennox ML193UH Installation Instructions Manual

Ignition Control

LED
TWIN
Integrated Control Diagnostic Codes
DIAGNOSTIC CODES
LED Status
LED Off
LED On
1 Flash
2 Flashes
3 Flashes
4 Flashes
5 Flashes
6 Flashes
7 Flashes
8 Flashes
9 Flashes
(Automatic Hot Surface Ignition System)
PUSH BUTTON
BLOWER OFF
DELAY JUMPER
Description
No power to control or control
harware fault detected.
Normal operation.
Flame present with gas vavle
de-energized.
Pressure switch closed with com-
bustion air inducer e-energized.
Pressure switch open with com-
bustion air inducer energized.
Primary limit switch open.
Rollout switch open.
Pressure switch cycle lockout.
Lockout, burners fail to light.
Lockout, buners lost flame too
many times.
Line voltage polarity incorrect.
INTEGRATED CONTROL
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
FIGURE 59
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 press-
ing the push button switch for more than 5 seconds.
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