Table Of Thermistor Characteristics - Panasonic U-26PE1U6 Technical Data & Service Manual

Check Pin
Short-circuit the cooling check pin (or heating check pin) on the outdoor unit control PCB to perform the control
described below.
1. Thermistor checks
The checks listed below are performed for 1 second each, in order from the top down. The results are displayed
by LED 1 and 2.
Thermistor
Discharge temp. (TD)
Outdoor air temp. (TO)
Heat exchanger temp. (C1)
Heat exchanger temp. (C2)
Intake temp. (TS)
2. 4-way valve turns ON for 1 second.
3. Forced cooling (or heating) operation

4-4. Table of Thermistor Characteristics

(1) Outdoor Air Temp. (TO), Intake Temp. (TS), Heat Exchanger Temp. (C1) Thermistor,
Heat Exchanger Temp. (C2) Thermistor
40
35
30
25
20
15
10
5
0
-4 5
(2) Discharge Temp. (TD) Thermistor
4
4
200
180
160
140
120
100
80
60
40
20
0
32 50
Check results
Normal
LED 1 lit
LED 2 lit
LED 1 lit
LED 1 lit
14 23 32 41 50 59 68
Temperature ( F)
68 86 104 122 140 158 176 194 212 230
Temperature ( F)
Abnormal
LED 1 and 2 OFF
8
7
6
5
4
3
2
1
0
68 86 104
Temperature ( F)
4-16
4. Service procedures
122 140