Tus neeg siv phau ntawv

4 Check for no voltage from the return lead on the condenser
fan connector to ground.
Evaporator Fan Test - Direct Current
The evaporator fan has 12 VDC power at all times. Evaporator
temperature determines the fan speed. See the Technical Data
section for evaporator fan rating.
1 Verify the control board model configuration is correct.
2 Disconnect the electrical connector from the fan.
3 Measure the resistance between the power wire and the
return wire.
4 Reconnect the fan.
5 Check for voltage between the power and return wires.
6 Check for voltage between the variable speed control and
return wires.
Built-In Evaporator Fan Wiring
The evaporator fan uses a four-wire system to control fan
operation. The four wires are fan power, variable speed control
out, tachometer input, and fan return. Measuring the DC voltage
between these wires should produce the following results.
EVAPORATOR FAN WIRE COLORS
Color Refrigerator Freezer
Red Power Power
Yellow
Variable speed
control
N/A
Yellow/brown N/A
Variable speed
control
Blue Tachometer input N/A
Blue/white N/A Tachometer input
White Fan return Fan return
FAN DC VOLTAGE TEST RESULTS
Test Measure Result
Measure fan power to fan
return
12 VDC
Measure variable speed
control to fan return
12 VDC at high speed
Measure tachometer input to
fan return
Variable VDC based on fan
speed
TIP: Test voltage under load.
Built-In Water Isolation Valve Test Procedure
Refer to the Water Flow diagram in this manual.
This procedure is for Built-In units above serial number
4380000.
On dispenser models, activating the dispenser confirms that the
isolation valve is opening.
To measure the resistance of the isolation valve solenoid:
1 Turn off the power to the unit.
2 Disconnect the electrical leads from the isolation valve
solenoid.
▪ On dual isolation valves, the solenoid is black with
yellow fittings.
▪ On the single isolation valve, the solenoid is brown
with yellow fittings.
3 Measure the resistance between the isolation valve solenoid
terminals. Compare the results with the Technical Data
table.
Built-In Dispenser Valve Test Procedure
Refer to the Water Flow diagram in this manual.
This procedure is for Built-In units above serial number
4380000.
On dispenser models, activating the dispenser confirms that the
dispenser valve is opening.
To measure the resistance of the dispenser valve solenoid:
1 Turn off the power to the unit.
2 Disconnect the electrical leads from the dispenser valve
solenoid.
▪ On dispenser models, the solenoid is tan with blue
fittings.
3 Measure the resistance between the dispenser valve
solenoid terminals. Compare the results with the Technical
Data table.
Built-In Ice Maker Valve Test Procedure
Refer to the Water Flow diagram in this manual.
This procedure is for Built-In units above serial number
4380000.
To measure the resistance of the ice maker valve solenoid:
1 Turn off the power to the unit.
2 Disconnect the electrical leads from the ice maker valve
solenoid.
▪ On water valves, the ice maker solenoid is purple with
yellow fittings.
3 Measure the resistance between the ice maker valve
solenoid terminals. Compare the results with the Technical
Data table.
Built-In Dispenser Water Valve Test Procedure
Refer to the Water Flow diagram in this manual.
This procedure is for Built-In units above serial number
4380000.
ICBBI-42UFDID
Troubleshooting
BUILT-IN CONDENSER FAN TESTING (continued)
service.subzero.com
7041397 REVA 12/2017
163