31
13.0
Troubleshooting (cont’d)
Problems Possible causes You should try this
4. The 20/40/60-minute The switch may be defective.
push-button timer does
not work OR 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
be defective. wire (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.
VE0081
OL
OC
OL
OC
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