25
Sp
ec
ific
at
io
ns
s
ub
je
ct
to
c
ha
ng
e
w
ith
ou
t n
ot
ice
.
S
G
-3
8M
PR
A-
02
ERROR DIAGNOSIS AND TROUBLESHOOTING WITHOUT ERROR CODE (continued)
Table 21 — Field Maintenance
Field Maintenance
Others
Possible causes
of trouble
Heavy load condition
Loosen hold down
bolts and/or screws
Shipping plates remain attached
Poor choices of capacity
Contact of piping with
other piping or external plate
Unit will not start
Compressor will not start
however the fan runs
Compressor and condenser
(outdoor) fan will not start
Evaporator (indoor) fan
will not start
Condenser (outdoor) fan
will not start
Unit runs but shortly stops
Compress or short cycles
due to overload
High discharge pressure
Low discharge pressure
High suction pressure
☆
Low suction pressure
Unit runs continuously
but insufficient cooling
☆
☆
Too cool
Compressor is noisy
☆
☆
☆
Horizontal louver
can not revolve
Test method / remedy
Check heat load
Tighten bolts or screws
Remove them
Choose AC of larger capacity or add
the number of units
Fix piping as not to touch each
other or external pipe
