Johnson Controls HVWHP072B32S - Page 81

SM-18006
3-61
TROUBLESHOOTING
l
 TheRUNindicator(red)ashes.
l
The indoor unit number (refrigerant cycle number - address number), the alarm code, the model code
1
,
the model name
1
and the number of connected indoor units are displayed on the LCD. The water source
unit number and the alarm code are displayed on the 7-segment display of the water source unit PCB.
Note 1: Except for some models.
In the following cases during operation, the compressor stops and then the operation is automatically
retried. If this occurs again twice in the next 60 minutes, this alarm code is displayed.
(1) Heat Exchanger Mode is other than “COND”, “D1” or “D1-1” and Suction Gas Pressure “Ps” is below
87 psi (0.6 MPa) for 10 minutes.
(2) Evaporation Gas Line Temperature “Tg” is below 32
o
F (0
o
C) for 5 minutes or Evaporation Liquid Line
Temperature “Te” is below 26.6
o
F (-3
o
C) for 5 minutes.
(3) Entering Water Temperature “Ta” is below 39.2
o
F (4
o
C) for 50 seconds.
MV1 MV3 MV4 MVB
CN10 CN13 CN15 CN12
1: Refer to "Characteristics of Thermistor" of "Alarm Code 23".
2: W.S. PCB Connector No. is shown in the table.
Are thermistors reading
correctly?
1
Yes
Yes
Yes
Yes
Yes
Failure of Thermistor
No
No
No
No
No
Are thermistors installed
correctly?
Install it correctly.
Is amount of
refrigerant correct?
Is there refrigerant leak?
Plug connectors
2
of W.S. PCB properly.
Charge correct
refrigerant volume.
Check expansion valve
and solenoid valve (SVB).
Repair refrigerant leaks.
Recharge refrigerant.
Are connectors
2
of
W.S. PCB of water source
unit expansion valve
connected properly?
W.S. PCB: Water Source Unit PCB (PCB1)
Model
Ta
(THM7)
Te
(THM10)
Tg
(THM12)
(H,Y)VWH(P,R)072-216B(3,4)2S
Alarm
Code
Water Temperature Abnormality