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The following troubleshooting guide will assist the user in identifying
various possible problems:
1. No Power. - Check power at the wall outlet.
2. No indication on LCD display, but Green Dehumidifier LED is
on. - LCD display defective. Return unit to factory.
3. Obviously incorrect humidity reading – If sensor was removed
from its connector, check to see that it has been replaced
properly. The arrow (
5
) should line up with the left hand side of
the sensor with the sensing grill facing up. If it was reversed
reinstall properly. The sensor will not be damaged if plugged in
backwards.
Next, check sensor operation by blowing gently onto sensor for
several seconds and observe the reading. If the humidity
increases, the humidity sensor is working. Depress the
READ/SET PT switch and adjust the ADJUST control fully CCW
and then rotate it fully CW. The display should show readings
approximately 0 to 100% RH. If not, return the unit to the
factory.
4. Incorrect RH set point readings – Return the unit to the factory.
5. No DEHUMIDIFY AC control voltage – Turn on the
DEHUMIDIFIER switch. Read the humidity level on the LCD
display. Adjust the set point to that level. Rotate the control at
least ±5% R.H. about this point. The Green DEHUMIDIFIER
indicator should come on when the set point is below the
measured humidity. When the set point is above the measured
humidity the Green indicator should be off. If the light cycles, but
the dehumidifier still fails to operate, either the 2 Amp internal
fuse or the solid-state relay may be blown or the
Dehumidification System may have failed. The fuse and relay
can be replaced by the user.
Access to the PC board requires removing the front panel. Snap
off the front bezel as shown in Figure 3.2-5 and remove the 4
screws. It may also be necessary to remove the rear panel to
provide enough slack in the internal wiring to reach the fuse or
U1. Reverse the procedure to reassemble.
