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Fujitsu FO20R Series Installation Instructions Manual page 62

Variable speed r-410a heat pump outdoor units
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9.0 DIAGNOSTICS & TROUBLESHOOTING
9.9 Defrost Mechanical Checks Flowchart
No
Defrost
Reversing Valve
Stuck
Welded Reversing Valve
Relay on Control Board
Loose Defrost
Sensor
Check Coil
Sensor Connector
62
Defrost
System
Incomplete
Defrost
Sensor in Wrong
Location
Wrong Defrost
Timer Setting
Failed Defrost Relay
on Control Board
(Doesn't stop O.D. fan)
Thermostat Satisfies
During Defrost
Inadequate Indoor
Airflow
Excessive
Defrost Time
Sensor in Wrong
Location
Low System
Charge
Wind Affecting
Defrost
Inadequate Indoor
Airflow
Dirty or Restricted
Outdoor Coil
Bad Outdoor
Motor or Fan
Dip Switch #1 on
SW2 is Off

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