180
TROUBLESHOOTING
Inspection item Measurement point Normal voltage (V) Normal resistance value (Ω)Remark
Compressor discharge pipe
temperature sensors 1, 2
(C/P T1, C/P T2)
1: CN4[27]-[28]
White-White
2: CN4[25]-[26]
Yellow-Yellow
Temperature
( ℉ ( ℃ ))
Resistance
(Ω)
• Disconnection temperature is
detected (lower than 41 ℉
(5 ℃ )).
Disconnection is detected for
10 minutes during compressor
1 operation. (compressor dis-
charge pipe temperature sen-
sor 1 disconnection→78-0)
Disconnection is detected for
10 minutes during compressor
2 operation. (compressor dis-
charge pipe temperature sen-
sor 2 disconnection→78-1)
• Short circuit temperature is
detected (248 ℉ (120 ℃ ) or
higher).
Short circuit is detected for 1
minute (compressor discharge
pipe temperature sensor 1
short circuit→91-2) (compres-
sor discharge pipe tempera-
ture sensor 2 short circuit→
91-3)
32 (0) 182.9 k
68 (20) 70.4 k
122 (50) 20.2 k
176 (80) 7.0 k
212 (100) 3.7 k
248 (120) 2.1 k
Compressor intake temper-
ature sensor (C/P S)
CN4[23]-[24] White-White Temperature
( ℉ ( ℃ ))
Resistance
(Ω)
• Disconnection temperature is
detected (lower than -38 ℉
(-39 ℃ )).
Disconnection is detected for
1 minute. (outdoor heat ex-
changer liquid temperature
sensor disconnection→65-0)
(sub heat exchanger liquid
temperature sensor discon-
nection→66-1) (outdoor liquid
pipe temperature sensor dis-
connection→67-0) (compres-
sor intake temperature sensor
disconnection→53-0) (accu-
mulator outlet temperature
sensor disconnection→55-0)
(outdoor heat exchanger gas
temperature sensor discon-
nection→85-0)
• Short circuit temperature is
detected (194 ℉ (90 ℃ ) or
higher).
Short circuit is detected for
1 minute. (outdoor heat
exchanger liquid temperature
sensor short circuit→65-2)
(sub heat exchanger liquid
temperature sensor short
circuit→66-1) (outdoor liquid
pipe temperature sensor short
circuit→67-2) (compressor in-
take temperature sensor short
circuit→53-2) (accumulator
outlet temperature sensor
short circuit→55-2) (outdoor
heat exchanger gas tempera-
ture sensor short circuit→85-
2)
14 (-10) 23.7 k
32 (0) 15.0 k
Accumulator outlet temper-
ature sensor (AOT)
CN4[13]-[14] White-White 50 (10) 9.8 k
68 (20) 6.5 k
86 (30) 4.4 k
Sub heat exchanger liquid
temperature sensor (SOT)
CN4[15]-[16] Blue-Blue 104 (40) 3.1 k
122 (50) 2.2 k
131 (55) 1.86 k
Outdoor liquid pipe temper-
ature sensor (ILT)
CN4[29]-[30] Black-Black 140 (60) 1.59 k
149 (65) 1.36 k
158 (70) 1.17 k
Outdoor heat exchanger
liquid temperature sensor
(THL)
CN4[19]-[20] Yellow-Yellow
167 (75) 1.01 k
Outdoor heat exchanger
vapor temperature sensor
(THG)
CN4[17]-[18] White-White
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