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Only for training and service purposes
Part 4 Trouble Shooting
4
• Heat-sink thermistor is damaged(short or open).
• Heat-sink Temp. is over 95°C(203°F)
• Damage or defect on the sensing circuit of outdoor pcb assembly.
(R01H, R02H, C01H)
Heat-sink Temp. is over
95°C(203°F)
Heat-sink thermistor
is open or short
Heat-sink thermistor in INV-IC is
Right ?
Sensing circuit of outdoor
pcb is right ?
YES
No
Check heat-sink thermistor
-
Measure resistance of thermistor
(about 10kΩ at 25°C(77°F))
Heat-sink thermistor is connected
to outdoor PCB assembly?
YES
No
- Connect to CN-TH2 in
outdoor PCB assembly
No
- Check soldering state of
R01H, R02H, C01H
Check flow
9k,12kBtu/h Model Heat-sink Thermistor resistance check
Description Cause of error
Error code
120
R-T Graph
Temperature
Resistance[kΩ]
100
80
60
40
20
0
20 30 40 50 60 70 80 90 100 110 120 130 [˚C]
[˚F]
68 86 104 122 140 158 176 194 212 230 248
266
Ω