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Problems Possible causes You should try this
4. The 20-minute push-button • The switch
or the 20/40/60-minute may be defective.
push-button timer does
not workOR its indicator
light does not stay on.
• Unplug the unit. Disconnect the main control
and the optional(s) control(s) (if need be). Jump
the OL and OC terminals. Plug the unit. If the
unit switches to high speed, replace the switch.
5. The defrost cycle • Ice deposits may be hindering • Remove the ice.
does not work the damper operation.
(the fresh air duct is
frozen OR the fresh air• The damper rod or the port • Inspect these parts and replace if necessary.
distributed is very cold damper itself may be broken.
OR the “AIR EXCHANGE”
light flashes). • The damper actuator • Plug in the unit and select “MIN” or “MAX”.
may be defective. Press the door switch and see if the port damper
opens. If it doesn’t open, feed 120V directly to
the damper actuator. If the port damper still does
not open, replace the damper actuator.
• The circuit board may • Unplug the unit. Unplug the defrost sensor wire
be defective. (see J4 on electrical diagrams, Section 9.0).
Plug the unit back in. Select “MIN” and make sure
the unit is adjusted for low speed operation (turn
all dehumidistats maximum counterclockwise).
Wait 3 minutes. The unit should switch to high
speed and the damper at the fresh air intake
port should close (defrost mode). If this does
not happen, then replace the circuit board.
• The thermistor may • If the defrost mode works well after having
be defective. disconnecting the thermistor wire (above test),
this means the thermistor is probably defective.
You should replace it.
13.0
Troubleshooting (cont’d)
VE0067
OL
OC