Johnson Controls HVWHP072B32S - Page 68

3-48
SM-18006
TROUBLESHOOTING
( )
Is LED3 (yellow)
on I.U. PCB ON?
Is LED3 (yellow) on
I.U. PCB flashing more
than once in 10 seconds.
Yes
Faulty W.S. PCB.
Set it correctly.
Faulty I.U. PCB.
Faulty I.U. PCB.
Check wiring between
water source unit and
indoor units or fuse (EF)
for I.U./W.S. PCB.
No
Yes
No
Does Alarm occur with
all indoor units?
Yes
No
Check other indoor units.
No
No
Is LED3 (yellow)
ON even if connector
CN2 on I.U. PCB
is removed?
YesYes
Indoor
Unit
Does refrigerant system
No. setting between
W.S. and I.U correspond?
W.S.: DSW1 and RSW1
I.U.: DSW5 and RSW2
4
Yes
Set it correctly.
No
for wall mounted
Is SW1 of PCB set to “ ”
(Nonpolar Setting)?
2
W.S. PCB: Water Source Unit PCB (PCB1)
I.U. PCB: Indoor Unit PCB
(Model: TIWM006B21S to TIWM030B21S)