Haier HSM18HEKC03/R2 Service Manual page 63

outdoor display
Method of the exhaust temperature control is checked with the temperature being detected
Malfunction by the exhaust pipe thermistor
Detection
Malfunction when the compressor discharge temperature is above 117
Decision
Conditions
Supposed
Causes
Troubleshooting * Caution Be sure to turn off power switch before connect or disconnect connector, or
Electrify the machine again and turn it on with
the remote controller, then measure the
temperature at the exhaust temperature sensor
of the compressor on the outdoor unit
the temperature
exceeds 110
after the machine
Measure the temperature at the exhaust temperature
sensor of the compressor on the outdoor unit
Malfunctions occur after running
for some time? even though the
asured temperature is below 117
.
Pull out the exhaust sensor and measure its
resistance at standard
according to the resistance-temperature table
HSM18HEKC/HRAC03/R2(DB)HUM18HC03/R2(DB)-SM
LED1 flash 8 times
Electronic expansion valve defective
Faulty thermistor
Faulty PCB
else damage maybe occurred.
shortly
NO
NO
temperatures
1) The cryogen may have been leaked during
installation, or there may be leakage in the
YES
piping system.
2) There may be other causes to make the
exhaust temperature too high.
Exhaust temperature
YES
sensor is broken and
needs be replaced
NO
The sensor is damaged. Replace the sensor
with a new one.
61
Service Diagnosis
Domestic Air Conditioner