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On dispenser models, activating the dispenser confirms that the
dispenser water valve is opening.
To measure the resistance of the dispenser water valve
solenoid:
1 Turn off the power to the unit.
2 Disconnect the electrical leads from the dispenser water
valve solenoid.
▪ On the dispenser water valve, the solenoid is blue with
blue fittings.
3 Measure the resistance between the dispenser water valve
solenoid terminals. Compare the results with the Technical
Data table.
Built-In Defrost Heater Test Procedure
This procedure is for Built-In units with a freezer above serial
number 4380000.
Confirm the defrost heater is working by activating the defrost
system in manual component activation mode, which lasts for
five minutes. See the instructions in the Controls and Operation
section.
The defrost heater operation can be confirmed by monitoring
the evaporator temperature displayed on the control panel
during defrost heater activation, or by removing the freezer air
duct and viewing the defrost heater.
WARNING
DISCONNECT ELECTRICAL POWER TO ANY
APPLIANCE COVERED IN THIS MANUAL BEFORE
SERVICING. IF ELECTRICAL POWER IS NEEDED
FOR COMPONENT TESTING OR DIAGNOSTICS,
DISCONNECT ELECTRICAL POWER IMMEDIATELY
AFTER TESTING OR DIAGNOSTICS ARE
COMPLETED. FAILURE TO DO SO COULD CAUSE
SERIOUS INJURY OR DEATH!
If the defrost heater is not activating, perform the following
checks to find the issue.
DEFROST HEATER TEST PROCEDURES
Measurement Procedure
Defrost heater
resistance
1
Turn off the power to the unit.
2 Disconnect the defrost heater wire
harness from the unit wire harness.
3 Measure the resistance between the
defrost heater terminals. Compare
the results with the Technical Data
table.
4 If the results are good, check the
defrost terminator for continuity.
5 If the results are bad, replace the
defrost heater.
Defrost terminator
resistance
1 Run the freezer system with the door
or drawer open for five minutes to
verify the defrost terminator is
closed.
2
Turn the power off to the unit.
3 Disconnect the defrost terminator
from the defrost wire harness.
4 Measure the resistance across the
terminals of the defrost terminator
connector.
5 If the resistance is very large or
infinite, the defrost terminator is
open. Replace the defrost terminator.
6 If the resistance is low or zero, the
defrost terminator is good. Check the
voltage to the defrost heater.
Defrost heater voltage 1 Activate the defrost system in
manual component activation mode.
2 Back pin the gray/white wire on the
defrost connector. In volts AC,
measure the voltage from the gray/
white wire to ground.
3 If the voltage is approximately 230
VAC, the voltage to the defrost
heater is good.
4 If the voltage is good, activate the
defrost system again and see if it is
operating correctly. It might be
necessary to cool the freezer
evaporator to close the defrost
terminator first.
5 If the voltage is not good, measure
the voltage to the defrost terminator.
Defrost terminator
voltage
1 Activate the defrost system in
manual component activation mode.
2 Back pin the blue wire in the defrost
terminator connector. In volts AC,
measure the voltage from the blue
wire to ground.
3 If the voltage is approximately 230
VAC, the voltage to the defrost
terminator is good.
4 If the voltage is good, remove the
defrost terminator, and check the
ICBBI-42UFDID
Troubleshooting
BUILT-IN DISPENSER WATER VALVE TEST PROCEDURE (continued)
service.subzero.com
7041397 REVA 12/2017
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