[russboldry]

my frech food side has a small evap. unit in it and it is frosting up what do i need to do to correct it there is no defrost heater on this side and it is cousing me to loos food in fridge

[Joe / APP Team]

Originally Posted by russboldry

my frech food side has a small evap. unit in it and it is frosting up what do i need to do to correct it there is no defrost heater on this side and it is cousing me to loos food in fridge

Russ,

You're correct, there is no defrost heater for the refrigerator evaporator,

This is how it works :

Fresh Food Evaporator Defrost Cycle

The refrigerator utilizes a forced air cycle defrost method (no electric heater) to remove frost from the fresh food evaporator. Fresh food air that is above freezing temperature circulates thru the coil and melts any accumulated frost. Note that during fresh food defrost, the compressor may still be running, cooling only the freezer section.

The fresh food section cools until the fresh food thermistor is satisfied.

If both freezer and fresh food thermistors are satisfied, the compressor cycles off. If the freezer still requires cooling, the main control board rotates the 3-way valve to stop refrigerant flow to the fresh food evaporator. Even though refrigerant flow has stopped in the fresh food evaporator, the fresh food fan continues to run at low speed.
The system is designed to run the fan until the fresh food evaporator thermistor reaches 35°F. Once this temperature is reached, the fan continues to run for an additional 5 minutes. Under normal conditions, the defrost time takes approximately 30 minutes. The maximum time the fan runs in low speed is 60 minutes. If the evaporator thermistor has not reached 35°F after 60 minutes, the control switches to extended defrost #1.

If the evaporator fan works, and there is a resistance reading on the thermistor. We'd have to start checking for a bad 3 way valve or bad check valve in the evaporator system ( a sealed system problem).


Good Luck,