Rheem RA17 Series User Manual

47
Diagnostics
SYMPTOM POSSIBLE CAUSE REMEDY
Unit will not run • ower o or loose electrical connection
• Thermostat out of calibration  set too high
• Defective control board
• lown fusestripped breaer
• Transformer defective
• igh-pressure control open
Low-pressure control open
• iswiring of communications communication
light on continuously)
• hec for correct voltage at line voltage connections in
condensing unit.
• eset.
• hec control board diagnostic codes.
• eplace fusesreset breaer.
• hec wiring. eplace transformer.
• eset. Also see high head pressure remedy. The high-
pressure control opens at 610 PSIG.
• hec communication wiring.
Outdoor fan runs,
compressor doesn't
• un or start capacitor defective
• ontactor defective
• oose connection
• ompressor stuc, grounded or open motor
winding, open internal overload.
• ow-voltage condition
• eplace.
• eplace.
• hec for correct voltage at compressor. hec and
tighten all connections.
• ait at least 3 hours for overload to reset. If still open,
replace the compressor.
• Add start it components.
Insucient cooling • Improperly sied unit
• Improper indoor airow
• Incorrect refrigerant charge
• Air, noncondensibles, or moisture in system
• ad ID 
• ecalculate load.
• hec. Should be approximately 400  per ton.
• harge per procedure attached to unit service panel.
• ecover refrigerant. vacuate and recharge. Add lter
drier.
• eplace 
Compressor short
cycles
• Incorrect voltage
• Defective overload protector
• efrigerant undercharge
• At compressor terminals, voltage must be  10 of
nameplate marking when unit is operating.
• eplace. hec for correct voltage.
• Add refrigerant.
Registers sweat • ow indoor airow • Increase speed of blower or reduce restriction.
eplace air lter.
High head, low vapor
pressures
• estriction in liquid line, expansion device, or
lter drier
• ad 
• emove or replace defective component.
• erify thermistor and pressure transducer connection
and operation.
High head, high
or normal vapor
pressure – Cooling
mode
• Dirty outdoor coil
• efrigerant overcharge
• utdoor fan not running
• Air or noncondensibles in system
• lean coil.
• orrect system charge.
• epair or replace.
• ecover refrigerant. vacuate and recharge.
Low head, high vapor
pressures
•  in bypass mode
• ad compressor
• erify thermistor and pressure transducer connection
and operation.
• eplace compressor.
Low vapor, cool
compressor, iced
indoor coil
• ow indoor airow
• perating below 65 outdoors
• oisture in system
• losed ID circuit
• Increase speed of blower or reduce restriction.
eplace air lter.
• Add ow Ambient it.
• ecover refrigerant. vacuate and recharge. Add lter
drier.
• epair or replace ID coil
High vapor pressure • xcessive load
• Defective compressor
• echec load calculation.
• eplace.
Fluctuating head and
vapor pressures
•  hunting
• Air or noncondensibles in system
• hec thermistor to vapor line connection.
• hec air distribution on coil.
• hec suction thermistor and pressure transducer
and operation.
• ecover refrigerant. vacuate and recharge.
• emove and conrm  movement. lean  inside
with nitrogen to remove any debris then reinstall.
Gurgle or pulsing
noise at expansion
device or liquid line
• Air or noncondensibles in system • ecover refrigerant. vacuate and recharge.
DIAGNOSTICS
General Troubleshooting Chart
WARNING: 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.

Rheem RA17 Series Specifications

General

Brand	Rheem
Model	RA17 Series
Category	Heat Pump
Language	English