Table of Contents
Advertisement
13.0 Troubleshooting
Problems
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.
5. The defrost cycle
does not work
(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).
(cont'd)
Possible causes
• Ice deposits may be hindering • Remove the ice.
the damper operation.
• The damper actuator
may be defective.
• The circuit board may
be defective.
• The thermistor may
be defective.
You should try this
VE0067
• 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.
• Plug in the unit and select "MIN" or "MAX".
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.
• Unplug the unit. Unplug the defrost sensor 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.
• If the defrost mode works well after having
disconnecting the thermistor wire (above test),
this means the thermistor is probably defective.
You should replace it.
31
OL
OC
Advertisement
Table of Contents
Troubleshooting
