Tech Tips
Unit Will Not Go Into Defrost
(FI0031)

• Time Temperature Defrost
• Defrost Thermostat Open
• Defrost Thermostat Loose or Not Properly Secured to Coil
• Defrost Time Not Set Correctly for Unit Application
• No Power to Defrost Control
• Reversing Valve Not Shifting
• Bad Defrost Relay
• Bad Defrost Control
• Bad Reversing Valve
• Demand Defrost
• Coil Sensor Loose or Not Secured Properly to Coil
• Air Sensor In Contact With Coil
• No Power to Defrost Control
• Reversing Valve Not Shifting
• Bad Defrost Relay
• Bad Defrost Control
• Bad Reversing Valve