Troubleshooting - Goodman MSG-12CRN1N Service Instructions Manual

TROUBLESHOOTING

Display Board
(18k and 24k MODELS)
Operation:
The indicator flashes once every second after the power is on and will be illuminated when the unit is in operation.
TIMER Indicator:
The indicator illuminates then TIMER is set ON.
PRE-DEF. Indicator (For cooling & heating mode only - for cooling only, it's FAN ONLY):
The air conditioner begins defrosting automatically if the outdoor unit frosts in heating operation. At this time, PRE-DEF.
indicator illuminates.
For cooling only: when the unit operates in FAN ONLY mode, the FAN ONLY indicator illuminates.
AUTO Indicator:
This indicator will flash when the air conditioner is in AUTO operation.
12K Models
Indoor fan speed is abnormal for over 1 minute
Indoor room temperature or evaporator sensor is
open circuit or short circuit
Overcurrent protection of the compressor occurs 4 times
Control Board error
Indoor unit communication error
Outdoor condenser temperature sensor is
open circuit or short circuit
x
= Off = Flashing
18K & 24K Models
Overcurrent protection of the compressor occurs 4 times
Indoor room termperature sensor is
open circuit or short circuit
Temperature sensor on indoor evaporator is
open circuit or short circuit
Temperature sensor on outdoor condenser is
open circuit or short circuit
(without for cooling only models)
Outdoor unit protects (outdoor temperature sensor,
phase, order, etc.)
Control Board error
Indoor unit communication error
x
= Off = Flashing
20
OPERATI ON AUTO
Mode
Mode
HIGH VOLTAGE!
DISCONNECT ALL POWER BEFORE SERVICING OR INSTALLING THIS
UNIT. MULTIPLE POWER SOURCES MAY BE PRESENT. FAILURE TO
DO SO MAY CAUSE PROPERTY DAMAGE, PERSONAL INJURY OR DEATH.
TIMER PRE.-DEF.
Operation Timer
Lamp Lamp
x
ON
x
ON
Operation Timer
Lamp Lamp
x
x
x x
x x
x
x x
Illuminates simultaneously
Illuminates alternately
Defrosting Auto
Lamp Lamp
x x
x x
x
x
x