3.Defrost Thermostat
1)Remove the refrigeration system cartridge. Perform steps 1 through 16 in "IV.B.2.
2)Disconnect the defrost thermostat wires, then remove the defrost thermostat. See Fig. 5.
3)Install the new defrost thermostat and connect the thermostat wires.
4)Once the repair is complete, return to step 17 in "IV.B.2.
4.Rail Thermistor
1)Open the front panel. Move the power switch to the "OFF" position, then unplug the unit.
2)Remove the storage pans from the rail area. If wet, dry the rail area with a dry cloth.
3)Remove the left side rail fan motor shroud. See Fig. 6.
4)Cut the ties securing the rail thermistor to the bracket.
5)Secure the new thermistor connector to the old thermistor in the rail area. DO NOT cut the new thermistor wire.
6)Remove the wire access hole sealant and grommet.
7)Push the old thermistor wire (with new thermistor wire securely attached) into the
rail channel. Once the new thermistor wire is in the channel, replace the access hole grommet. Remove the left side panel, then pull the thermistor wire through the rail channel.
Rail Fan Motor
Bracket
Rail Thermistor 
Rail Thermistor 
Fig. 6
8)Disconnect the old thermistor connector from the control box connector, then connect the new thermistor connector to the control box connector.
9)Secure the new rail thermistor to the bracket with a cable tie.
10)Seal the access hole with food grade silicone.
11)Replace the rail fan motor shroud in its correct position and secure. Make sure all wires are clear of the fan.
12)Replace the panel and empty storage pans in their correct positions.
13)Plug in the unit, then move the power switch to the "ON" position and the rail switch to the "NORMAL" position to start the unit's cooling process.
14)Do not place food product in the rail area until the rail section has cooled down.
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