Carrier 40MPHA Service Manual page 20

ERROR DIAGNOSIS AND TROUBLESHOOTING WITHOUT ERROR CODE (CONT)
Field Maintenance
Possible causes of trouble
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
Table 14—Field Maintenance (Con't)
Heavy load condition Loosen hold down bolts and/or screws
☆
☆
Check heat load Tighten bolts or screws
Others
Shipping plates remain attached
☆ ☆
Remove them
Contact of piping with other
Poor choices of capacity
piping or external plate
☆
Choose AC of larger capacity or add the Fix piping as as not to touch each
number of units
☆
other or external pipe