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16.4 DEFROST MECHANICAL CHECKS FLOW CHART
DEFROST SYSTEM
No Defrost
Incomplete Defrost
Excessive Defrost
Reversing Valve Stuck
Poor Sensor Location
Wrong Defrost Control
Timer Setting
No Defrost Timer
Wrong Defrost Control
Control Power
Timer Setting
Poor Sensor Location
Failed Defrost Control
Failed Defrost Relay
Low System Charge
(doesn’t stop O.D. Fan)
Failed Defrost Relay
Thermostat Satisfies
Wind Affecting
During Defrost
in Defrost
Loose Defrost
Sensor
