Carrier 40MPHA Service Manual page 19

ERROR DIAGNOSIS AND TROUBLESHOOTING WITHOUT ERROR CODE (CONT)
Field Maintenance
Restricted
Possible causes Compressor Refrigerant
of trouble stuck Shortage
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 (out­
door) 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
Replace
Test method / Replace the
Leak test
remedy compressor restricted
Insufficient
Dry Dirty air
Refrigerant
liquid air evaporator through
overcharge
line filter coil
evaporator
coil
☆ ☆
☆
☆
☆
☆ ☆ ☆ ☆
☆ ☆ ☆ ☆
☆
Change
Clean
the Check charged
or
Clean coil
fan refrigerant
replace
part volume
Table 13—Field Maintenance (Con't)
Refrigerant Circuit
Air or non-
Dirty or Short
condensable High temp.
partially cycling of
gas in condensing
blocked condensing
medium
refrigerant
condenser air
cycle
☆
☆
☆ ☆ ☆ ☆
☆ ☆ ☆
Clean Purge, Remove
Remove
condenser evacuate obstruction
obstruction
or remove and in air or
to air flow
obstacle recharge water flow
Broken
Insufficient Expansion
compressor
Insufficient
condensing valve
internal compressor
medium obstructed
parts
☆
☆
☆
☆
☆
☆
Remove
Test
obstruction Replace Replace
compressor
in air or compressor valve
efficiency
water flow
Expansion Leaking
Power
valve or power
installation
capillary element on
of feeler
tube closed expansion
bulb
completely valve
☆ ☆
☆
☆ ☆
Replace Replace Fix feeler
valve valve bulb