Fujitsu FO2416RTJNAA - Page 47

47
9.0 DIAGNOSTICS & TROUBLESHOOTING
9.10 Troubleshooting Tips
Diagnostics
COOLING MODE
TROUBLESHOOTING TIPS
SYSTEM
PROBLEM
INDICATORS
DISCHARGE
PRESSURE
SUCTION
PRESSURE
SUPERHEAT
Normal:
5°–15°F
[2.8° – 8.3°C]
SUBCOOLING
Normal: See
Charging Chart
COMPRESSOR
AMPS
Overcharge High High /RZ High High
Undercharge /RZ /RZ High /RZ /RZ
Liquid Restriction
(Filter Drier)
/RZ /RZ High High /RZ
/RZ,QGRRU$LUÁRZ /RZ /RZ /RZ /RZ /RZ
Dirty Outdoor Coil High High /RZ /RZ High
Low Outdoor
Ambient Temperature
/RZ /RZ High High /RZ
,QHIÀFLHQW
Compressor
/RZ High High High /RZ
Indoor TXV Sensing
Bulb Charge Lost
/RZ /RZ High High /RZ
Poorly Insulated
Indoor Sensing Bulb
High High /RZ /RZ High
HEATING MODE
TROUBLESHOOTING TIPS
SYSTEM
PROBLEM
INDICATORS
DISCHARGE
PRESSURE
SUCTION
PRESSURE
SUPERHEAT
Normal:
5°–15°F
[2.8° – 8.3°C]
SUBCOOLING
Normal: See
Charging Chart
COMPRESSOR
AMPS
Overcharge High High 2. High High
Undercharge /RZ /RZ 2.RU+LJK /RZ /RZ
Liquid Restriction
(Filter Drier)
/RZ /RZ High High /RZ
/RZ2XWGRRU$LUÁRZ /RZ /RZ /RZ /RZ /RZ
Dirty Indoor Coil High High /RZ /RZ High
Low Indoor Ambient
Temperature
/RZ /RZ 2. High /RZ
,QHIÀFLHQW
Compressor
/RZ High High High /RZ
Outdoor TXV Sensing
Bulb Charge Lost
/RZ /RZ High High /RZ
Poorly Insulated
Outdoor Sensing
Bulb
High High /RZ /RZ High