Purge valve
1. Test using the controller’s indicator lights. Shut unit off by holding the Off button for 3
seconds. Wait four minutes. Push and release the On button, observe the Purge Valve
indicator light. As the unit drains the reservoir, the purge valve will be powered. When it gets
power, the indicator light will be ON. If the purge valve does not open to drain the reservoir
when its indicator light is on, do a voltage check. Shut the unit down by holding the Off button
in for 3 seconds. Unplug the harness connection from the purge valve. Wait four minutes. Push
and release the On button to restart the machine. As the unit drains the reservoir, the purge
valve connection should receive full voltage. If it does, the purge valve should be replaced. If
there is no voltage, check voltage from the controller to ground. The purge valve pin is 3 (dump
valve on wiring diagram). If there is voltage from that pin to ground, but low voltage at the valve
harness connection, the harness has a broken wire or poor connection and must be replaced.
If the voltage to ground is low, the controller should be replaced.
Note: The coil of this valve is internally rectified, and will normally show infinite resistance when tested
with an ohmmeter.
September 2006 Page 65
Test Procedures - Loads
This light will be ON
when the Purge Valve is
in operation.