Frigidaire LGUB2642LF2 Service Manual page 105

Low/No Voltage At Coil(s)
There are a number of connections in the wiring harness
of a refrigerator. Check for good connections at all con-
nection points in the ice and water wiring harness.
On the ice maker, the wiring runs through the plug by the
condenser fan motor up to the ice maker, back down to
the same plug and into the diode harness.
On the water dispenser, the wiring runs from the plug
by the condenser fan motor to the plug at the bottom of
the freezer door, up to the dispenser, and back down
through the same plugs to the diode harness. A bad
connection at any of the plugs or wire terminals can stop
the valves from operating.
Voltage Readings At Green Coil Of Secondary Valve
When Ice Maker is Filling
Voltage at Outlet Voltage at Coil
120VAC 120±10% VAC
100VAC 100±10% VAC
100-120VAC 20-76 VAC
Voltage Readings At Yellow Coil Of Secondary Valve
When Filling A Glass With Water
Voltage at Outlet Voltage at Coil
120VAC 119±10% VAC
100VAC 99±10% VAC
100-120VAC 0-80 VAC
Voltage Readings At Beige Coil Of Primary Valve
When Ice Maker is Filling
Voltage at Outlet Voltage at Coil
120VAC 56±10% VAC
100VAC 48±10% VAC
100-120VAC 10-43 VAC
100-120VAC 0 VAC
Voltage Readings Blue Coil Of Secondary Valve
When Ice Maker is Filling
Voltage at Outlet Voltage at Coil
120VAC 100±10% VAC
100VAC 85±10% VAC
100-120VAC 20-76 VAC
When testing the current flowing to the Primary Valve Coil through the Diode, you are measuring 30 cycle
current instead of 60 cycle current. Therefore, the volt meter will read about 1/2 the voltage that is going to
the coil. The change in cycle of current does not effect the efficiency of an electromagnetic coil.
One common problem is that the connector on the water
valve coil is pushed on with the valve terminal over the
top of the terminal in the plug.
Chilled Water Valve
Place a glass against the actuator and push in to see if water
will pass through the valve (Yellow Coil) and the filter into
the bucket. If it does, replace the secondary valve. If it does
not, remove the primary valve, then disconnect the outlet
line from the primary valve and place a glass against the
actuator and push. If there is still no water, replace the pri-
mary valve. If water is coming through, replace the water
filter.
Condition
Normal
Normal at 105VAC
Bad connection, Bad Ice Maker control board
Condition
Normal
Normal
Bad connection or bad Fill Switch
Condition
Normal
Normal at 105VAC (Will require use of 50 Watt coil)
Bad connection, Fill Switch, or Heater in Ice Maker
Open Diode (If current is normal at secondary coil)
Condition
Normal
Normal at 105VAC (Will require use of 50 Watt coil)
Bad connection, Fill Switch, or Heater in Ice Maker
5-5
Water System