General Troubleshooting Guide - Rheem ECONET RP2024BJVCA Installation Instructions Manual

9.11 General Troubleshooting Guide

WARNING:
Failure to shut off power can cause electrical shock resulting in personal injury or death.
SYMPTOM
Unit will not run • Power off or loose electrical connection
• Thermostat set too high or low.
• Unit in active compresor protection
• lockout mode
• Blown fuses/tripped breaker
• Transformer defective
• High-pressure control open
• Miswiring of communications (communication
light on continuously)
• Defective control board
Outdoor fan runs, • Loose connection
compressor doesn't
• Communication cable disconnected or failed
• Compressor stuck, grounded or open motor
winding, open internal overload.
• Low-voltage condition
Insufficient cooling • Improperly sized unit
• Improper indoor airflow
• Incorrect refrigerant charge
• Air, noncondensibles, or moisture in system
• Restricted Refrigerant Circuit
Compressor short • Incorrect voltage
• Improperly sized unit
cycles
• Refrigerant undercharge
Registers sweat • Low indoor airflow
High head, low vapor • Restriction in liquid line, expansion device, or
pressures filter drier
• Stuck EXV
High head, high • Dirty outdoor coil
or normal vapor • Refrigerant overcharge
pressure – Cooling • Outdoor fan not running
mode • Air or noncondensibles in system
Low head, high vapor • EXV in bypass mode
pressures
• Reversing Valve leaking by
• Bad compressor
Low vapor, cool • Low indoor airflow
compressor, iced
indoor coil • Operating below 55°F outdoors
• Moisture in system
• Low ambient cooling not operating (coil or
ambient thermister failure)
High vapor pressure • Excessive load
• Defective compressor
Fluctuating head and • EXV hunting
vapor pressures
• Air or noncondensibles in system
Gurgle or pulsing • Air or noncondensibles in system
noise at expansion • Undercharge long line application
device or liquid line
9.0 DIAGNOSTICS & TROUBLESHOOTING
Disconnect all power to unit before servicing. Contactor may break only one side.
POSSIBLE CAUSE REMEDY
• Check for correct voltage at line voltage connections in
condensing unit.
• Reset – Power cycle high and low voltage to outdoor
• unit
• 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 [420 kPa].
• Check communication wiring.
• Check for correct voltage at filter and inverter. Check
and tighten all connections.
• Check control board diagnostic codes.
• Replace
• Recalculate load.
• Check airflow. Should be approximately 400 CFM per
ton.
• Charge per procedure attached to unit service panel.
• Recover refrigerant. Evacuate and recharge.
Replace filter drier.
• At inverter input terminals, voltage must be between
187-252VAC when unit is operating.
• Add refrigerant.
• Increase speed of blower or reduce restriction.
Replace air filter.
• Remove or replace defective component.
• Verify EXV operation.
• Clean coil.
• Correct system charge.
• Repair or replace.
• Recover refrigerant. Evacuate and recharge.
• Verify thermostat connections at EXV control
• Verify thermister and pressure transducer connection
and operation
• Replace compressor.
• Increase speed of blower or reduce restriction.
Replace air filter.
• Recover refrigerant. Evacuate and recharge. Replace
filter drier.
• Recheck load calculation.
• Replace compressor.
• Check thermistor to vapor line connection. Check air
distribution on coil.
• Check suction thermistor and pressure transducer
operation
• Recover refrigerant. Evacuate and recharge.
• Remove & confirm EXV movement. Clean EXV inside
with nitrogen to remove any debris then reinstall
• Recover refrigerant. Evacuate and recharge.
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