Johnson Controls YVAHP0721CW Series, Service Manual

Page: 239 / 416

SM-16007
TROUBLESHOOTING
Connect them.
No
No
Are thermistors connected to
THM10 (Te) or THM17 (Tchg)
on O.U. PCB?
Is resistance of thermistors
THM10 and TMH17 between
0.2k
W
and 840k
W
?
Yes
Yes
Failure of Thermistor
Failure of O.U. PCB
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Cause Check Item
Action
(Turn OFF Main Switch)
Event
Failure of
Thermistor
for Evaporating
Temperature
during Heating
Check resistance.
Replace thermistor
if faulty.
Failure
Check wiring to
O.U. PCB.
Repair wiring and
connection.
Incorrect Connection
Replace O.U. PCB
and check operation. Replace O.U. PCB
if faulty.
Failure of O.U. PCB
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0
10
20
30
40
50
60
70
80
82
61
46
35
27
20.5
16
12.5
10
8
5.3
3.6
2.5
90
Ambient Temperature (
o
F(
o
C))
Thermistor
Resistance
(kΩ)
Thermistor Characteristics
(-15) (-10) (-5) (0) (5) (10) (15) (20) (25) (30) (35) (40) (45) (50) (55) (60)
5 14 23 32 41 50 59 68 77 86 95 104 113 122 131 140