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C2648 Prodigy and Prodigy Plus Service Manual
Water Pumps
Test using the controller's indicator lights.
1. Check the indicator light during the freeze cycle. The light will be On for all but the 30 second anti-slush
period, so observe the light for one minute. When it is On, check the water pumps, both should be
operating. If only one is operating check for voltage to that pump, if there is no voltage, replace that pump.
One of the pumps will operate during the part of the drain cycle, when the purge valve light is on. If both are
off, check for voltage at the dump valve relay. The coil of that relay should have power when the purge light is
on, connecting power to one of the pumps. Check for voltage from the relay to the pump. If there is voltage to
the pump and it does not pump water, replace the pump. If there is no voltage at the pump and the purge valve
is working, replace the dump valve relay.
2. Test using an ohmmeter. Disconnect electrical power. Unplug the suspect water pump motor leads from the
harness. Measure the resistance of the motor windings. If open, replace the pump. Measure resistance to
ground. If there is any, replace the pump.
Only one water pump is ON when the purge valve light is ON
Water Pump light is ON when one or both pumps are in operation.
January 2015
Page 47
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