20
ERROR DIAGNOSIS AND TROUBLESHOOTING WITHOUT ERROR CODE (CONT)
Table 14—Field Maintenance (Con’t)
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 as not to touch each
other or external pipe
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