Ruud RD17AZ - Troubleshooting Tips

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9.4 Troubleshooting Tips
9.0 DIAGNOSTICS & TROUBLESHOOTING
Cooling Mode Trouble Shooting Tips
SYSTEM
PROBLEM
INDICATORS
DISCHARGE
PRESSURE
SUCTION
PRESSURE
SUPERHEAT
Normal: 5°–15°F
[2.8° – 8.3°C]
SUBCOOLING
Normal: See
Charging Chart
Overcharge
High High Low High
Undercharge
Low Low High Low
Liquid Restriction
(Filter Drier)
Low Low High High
Low Indoor Airow
Low Low Low Low
Dirty Outdoor Coil
High High Low Low
Low Outdoor
Ambient Temperature
Low Low High High
Inefcient
Compressor
Low High High High
Bad Indoor Suction
Pressure Transducer or
Faulty Measurement
Low Low High High
Poorly Insulated
Indoor Vapour Line
Thermistor or Bad
Thermistor
High High Low Low
Heating Mode Trouble Shooting Tips
SYSTEM
PROBLEM
INDICATORS
DISCHARGE
PRESSURE
SUCTION
PRESSURE
SUPERHEAT
Normal: 5°–15°F
[2.8° – 8.3°C]
SUBCOOLING
Normal: See
Charging Chart
Overcharge
High High OK High
Undercharge
Low Low OK or High Low
Liquid Restriction
(Filter Drier)
Low Low High High
Low Outdoor Airow
Low Low Low Low
Dirty Indoor Coil High High Low Low
Low Indoor Ambient
Temperature
Low Low OK High
Inefcient
Compressor
Low High High High
Bad Outdoor Suction
Pressure Transducer or
Faulty Measurement
Low Low High High
Poorly Insulated
Outdoor Vapour Line
Thermistor or Bad
Thermistor
High High Low Low
Maintenance