Trouble Criterion Of Main Parts; Thermistor; Drain Pump - Mitsubishi Electric Mr. Slim PEAD Series Technical & Service Manual

[ VII TROUBLESHOOTING ]

7. TROUBLE CRITERION OF MAIN PARTS

PEAD-(S)M35JA(L)(2)
PEAD-(S)M50JA(L)(2)
PEAD-(S)M60JA(L)(2)
PEAD-(S)M71JA(L)2
PEAD-(S)M100JA(L)2
PEAD-(S)M125JA(L)2
PEAD-(S)M140JA(L)2
Part name
Room temperature

thermistor

(TH1)
Pipe temperature
thermistor/liquid
(TH2)
Condenser/evaporator
temperature thermistor
(TH5)
8. THERMISTOR
<Thermistor Characteristic graph>
Thermistor for
lower temperature
Thermistor R
0
Fixed number of
Rt=15exp { 3480(
0°C
10°C
20°C
25°C
30°C
40°C

9. DRAIN PUMP

1 Red
2 Purple
3 Black
1. Check if the drain float switch works properly.
2. Check if the drain pump works and drains water properly in cooling operation.
3. If no water drains, confirm that the check code P5 will not be displayed 10 minutes after the
operation starts.
Note: The drain pump for this model is driven by the internal DC motor of controller board, so it is not
possible to measure the resistance between the terminals.
Normal
Red–Black: Input 13V DC
Purple–Black: Abnormal (check code P5) if it outputs 0–13 V square wave (5 pulses/rotation), and
the number of rotation is not normal.
HWE2107A
Measure the resistance with a tester.
(Part temperature 10°C ~ 30°C)
Normal
Room temperature thermistor (TH1)
Pipe temperature thermistor (TH2)
Condenser/evaporator temperature
thermistor (TH5)
± 3%
± 2%
1
1
) }
273+t 273
The fan starts to rotate.
Check method and criterion
Abnormal
Opened or short-circuited
- 54 -
< Thermistor for lower temperature >
50
40
30
20
10
0
-20 -10 0 10 20 30 40 50
Temperature (°C)
GB