22
ELECTRICAL TROUBLESHOOTING CHART — HEAT PUMP
NO
Is Line Voltage
Present at the Solenoid
NO
YES
YES
TROUBLESHOOTING CHART — HEATING
Noncondensables (air)
Overcharged
Low Airfl ow Across
Indoor Coil
Outdoor Ambient Too High
For Operation In Heating
High Head Pressure
REFRIGERANT SYSTEM DIAGNOSIS – HEATING
Moisture in System
Defective Compressor
Undercharged
Overcharged
Refrigerant System
Restriction
Reversing Valve not
Fully Seated
Low Airfl ow
Across Outdoor Coil
Outdoor Ambient Too High
for Operation in Heating
Low Suction Pressure
High Suction Pressure
Refrigerant System
Restriction
Low Head Pressure
Reversing Valve not
Fully Seated
Undercharged
Defective Compressor
Is the Solenoid Coil Good?
Reversing Valve Stuck
Replace the Reversing Valve
Replace the Solenoid Coil
Is the Selector Switch
Set for Heat?
HEAT PUMP
SYSTEM COOLS WHEN
HEATING IS DESIRED.
Summary of Contents for SM21L30-A
Page 23: ...23 MODEL SC06H10D...
Page 24: ...24 MODELS XQ05L10 A B XQ06L10 A B C D XQ08L10 A B XQ10L10 A B XQ12L10 A B...
Page 27: ...27 MODEL SL36L30 A...
Page 28: ...28 MODEL SL28L30 A...
Page 29: ...29 MODELS SL36L30 B...
Page 30: ...30 MODEL EQ08L11 A...
Page 31: ...31 MODELS ES12L33 A ES16L33 A EM18L34 A EM24L35 A...
Page 32: ...32 MODEL EL36L35 A...
Page 33: ...33 MODEL YS09L10 A YS09L10 B...
Page 34: ...34 MODELS YS13L33 A YM18L34 A...
Page 35: ...35 MODELS YL24L35 A...
