Troubleshooting - Daikin Maverick I MPS A03C Installation And Maintenance Manual

Disconnect all power to unit before servicing. Contactor may break only
one side. Failure to shut off power can cause electrical shock resulting in
personal injury or death.
Table 28: Cooling Troubleshooting Chart
Symptom
Unit will not run
Condenser fan runs, compressor doesn't
Insufficient cooling
Compressor short cycles
Registers sweat
High head-low vapor pressures
High head-high or normal vapor pressure Cooling
mode
Low vapor - cool compressor iced evaporator coil
Low vapor cool evaporator coil
High vapor pressure
Fluctuating head & vapor
Gurgle or pulsing noise at expansion device or liquid
line
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Possible Cause
Power OFF or loose electrical connection
Thermostat out of calibration-set too high
Failed contactor
Blown fuses/Transformer defective
High pressure control open (if provided)
Interconnecting low voltage wiring damaged
Loose connection
Compressor stuck, grounded or open motor winding,
open internal overload.
Low voltage condition
Low voltage condition
Improperly sized unit
Improper airflow
Incorrect refrigerant charge
Air, non-condensable or moisture in system
Incorrect voltage
Incorrect voltage
Defective overload protector
Refrigerant undercharge
Low evaporator airflow
Restriction in liquid line, expansion device or filter
drier
Flow check piston size too small
Incorrect capillary tubes
Dirty condenser coil
Refrigerant overcharge
Condenser fan not running
Air or non-condensable in system
Defective compressor valves
Incorrect capillary tubes
Low evaporator airflow
Operating below 65°F outdoors
Moisture in system
Excessive load
Defective compressor Replace
Air or non-condensate in system
Air or non-condensable in system
Remedy
Check for correct voltage at compressor contactor in
control box
Reset
Check for 24 volts at contactor coil replace if contacts
are open
Replace fuses.
Check wiring-replace transformer – Reset-also see
high head pressure remedy-The high pressure control
opens at 450 PSIG
Replace thermostat wiring
Check for correct voltage at compressor check &
tighten all connections
Wait at least 2 hours for overload to reset. If still open,
replace the compressor.
At compressor terminals, voltage must be within 10%
of rating plate volts when unit is operating
Add start kit components
Recalculate load
Check should be approximately 400 CFM per ton.
Charge per procedure attached to unit service panel
Recover refrigerant, evacuate & recharge, add filter
drier
At compressor terminals, voltage must be within 10%
of rating plate volts when unit is operating.
At compressor terminals, voltage must be ±10% of
nameplate marking when unit is operating.
Replace check for correct voltage
Add refrigerant
Increase speed of blower or reduce restriction replace
air filter
Remove or replace defective component
Change to correct size piston
Change coil assembly
Clean coil
Correct system charge
Repair or replace
Recover refrigerant, evacuate & recharge
Replace compressor
Replace coil assembly
Increase speed of blower or reduce restriction replace
air filter
Add low ambient kit
Recover refrigerant evacuate & recharge add filter
drier
Recheck load calculation
Recover refrigerant, evacuate & recharge
Recover refrigerant, evacuate & recharge
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IM 970-2 • MAVERICK I ROOFTOP
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