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Checking code Meaning, detecting method Cause Checking method & Countermeasure
<Other than THHS>
1 A short in the thermistor or
an open circuit was sensed.
The outdoor unit switches to
the temporary stop mode
with restarting after 3 min-
utes, then if the temperature
detected by the thermistor
just before restarting is in the
normal range, restarting
takes place.
2 If a short or open circuit in
the thermistor is detected
just before restarting, error
code “5101”, “5102”, “5105”,
“5106”, "5107", “5108” or
“5109” is displayed.
3 In the 3 minute restart mode,
the abnormal stop delay LED
is displayed.
4 The above short or open cir-
cuit is not detected for 10
minutes after the compres-
sor starts, or for 3 minutes
during defrosting or after re-
covery following defrosting.
<THHS>
If a heat sink (THHS) tempera-
ture of
-40°C is detected just
after the inverter starts or during
inverter operation.
1 When pressue sensor de-
tects 1kg/cm
2
or less during
operation, outdoor unit once
stops with 3 minutes restart-
ing mode, and restarts if the
detected pressure of pres-
sure sensor exceeds 1kg/
cm
2
imediately before re-
starting.
2 If the detected pressure of
sensor is less than 1kg/cm
2
immediately before restart-
ing, error stop is com-
menced displaying 5201.
3 Under 3 minutes restarting
mode, LED displays inter-
mittent fault check.
4 During 3 minutes after com-
pressor start, defrosting and
3 minutes after defrosting
operations, trouble detec-
tion is ignored.
Discharge
(TH1)
Low
pressure
saturation
(TH2)
Liquid
pipe (TH5)
Ambient
tempera-
ture (TH6)
SC coil
outlet
(TH7)
SC coil
bypass
outlet
(TH8)
Radiator
panel
(THHS)
Pressure
sensor
trouble
5101
5102
5105
5106
5107
5108
5110
5201
Check the thermistor’s resistance.
Check if the lead wires are pinched.
Check for tearing of the insulation.
Check if a pin is missing on the con-
nector.
Check if a wire is disconnected.
Check the temperature picked up by
the sensor using the LED monitor.
If the deviation from the actual tem-
perature is great, replace the MAIN
circuit board.
(In the case of the THHS, replace
the INV board.)
1) Thermistor
2) Lead wires are being pinched.
3) Insulation is torn.
4) A connector pin is missing, or there
is faulty contact.
5) A wire is disconnected.
6) The thermistor input circuit on the
MAIN circuit board is faulty.
(In the case of the THHS, replace
the INV board.)
Thermal Sensor Error, Outdoor Unit
Short Circuit Detection Open Circuit Detection
TH1 240°C or higher (0.57 kΩ)15°C or lower (321 kΩ)
TH2 70°C or higher (1.71 kΩ) -40°C or lower (399 kΩ)
TH3 70°C or higher (1.14 kΩ) -40°C or lower (130 kΩ)
TH4 70°C or higher (1.14 kΩ) -40°C or lower (130 kΩ)
TH5 110°C or higher (0.4 kΩ) -40°C or lower (130 kΩ)
TH6 110°C or higher (0.4 kΩ) -40°C or lower (130 kΩ)
TH7 70°C or higher (1.14 kΩ) -40°C or lower (130 kΩ)
TH8 110°C or higher (0.4 kΩ) -40°C or lower (130 kΩ)
THHS 100°C or higher (3.0 kΩ)-40°C or lower (2.5 kΩ)
1) Pressutre sensor trouble.
2) Inner pressure drop due to a leak-
age
3) Broken cover.
4) Coming off of pin at connector por-
tion, poor contact.
5) Broken wire
6) Faulty thermistor input circuit of
MAIN board.
See Troubleshooting of pressure
sensor.
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