General Troubleshooting Chart - Rheem FO13C Series Installation Instructions Manual

DIAGNOSTICS

General Troubleshooting Chart

WARNING:
unit before servicing. Contactor may break only one
side. Failure to shut off power can cause electrical
shock resulting in personal injury or death.
SYMPTOM
Unit will not run
Outdoor fan runs,
compressor doesn't
Insuffi cient cooling
Compressor short
cycles
Registers sweat
High head, low vapor
pressures
High head, high
or normal vapor
pressure – Cooling
mode
Low head, high vapor
pressures
Low vapor, cool
compressor, iced
indoor coil
High vapor pressure
Fluctuating head and
vapor pressures
Gurgle or pulsing
noise at expansion
device or liquid line
40
Disconnect all power to
POSSIBLE CAUSE
• Power off or loose electrical connection
• Thermostat out of calibration – set too high
• Defective control board
• Blown fuses/tripped breaker
• Transformer defective
• High-pressure control open
Low-pressure control open
• Miswiring of communications (communication
light on continuously)
• Run or start capacitor defective
• Contactor defective
• Loose connection
• Compressor stuck, grounded or open motor
winding, open internal overload.
• Low-voltage condition
• Improperly sized unit
• Improper indoor airfl ow
• Incorrect refrigerant charge
• Air, noncondensibles, or moisture in system
• Bad ID TXV
• Incorrect voltage
• Defective overload protector
• Refrigerant undercharge
• Low indoor airfl ow
• Restriction in liquid line, expansion device, or
fi lter drier
• Bad TXV
• Dirty outdoor coil
• Refrigerant overcharge
• Outdoor fan not running
• Air or noncondensibles in system
• Bad TXV
• Bad compressor
• Low indoor airfl ow
• Operating below 65°F outdoors
• Moisture in system
• Closed ID circuit
• Excessive load
• Defective compressor
• TXV hunting
• Air or noncondensibles in system
• Air or noncondensibles in system
REMEDY
• Check for correct voltage at line voltage connections in
condensing unit.
• Reset.
• Check control board diagnostic codes.
• Replace fuses/reset breaker.
• Check wiring. Replace transformer.
• Reset. Also see high head pressure remedy. The high-
pressure control opens at 610 PSIG.
• Check communication wiring.
• Replace.
• Replace.
• Check for correct voltage at compressor. Check and
tighten all connections.
• Wait at least 3 hours for overload to reset. If still open,
replace the compressor.
• 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 and recharge. Add fi lter
drier.
• Replace TXV
• 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 fi lter.
• Remove or replace defective component.
• Replace TXV.
• Clean coil.
• Correct system charge.
• Repair or replace.
• Recover refrigerant. Evacuate and recharge.
• Replace TXV.
• Replace compressor.
• Increase speed of blower or reduce restriction.
Replace air fi lter.
• Add Low Ambient Kit.
• Recover refrigerant. Evacuate and recharge. Add fi lter
drier.
• Repair or replace ID coil
• Recheck load calculation.
• Replace.
• Check TXV bulb clamp. Check air distribution on coil.
Replace TXV.
• Recover refrigerant. Evacuate and recharge.
• Recover refrigerant. Evacuate and recharge.