Aprilaire E100 - Page 22

TABLE 2: TROUBLESHOOTING GUIDE
Symptom Failure Mode Action
Dehumidier does
not turn on/run.
No power to unit.
• Check that the dehumidier is plugged in.
• Check that the power switch is turned ON (if equipped).
• Check that the user interface is turned ON.
• Check that the circuit breaker has not tripped.
Dehumidier
blower is running
but with little or no
airow.
Pressure drop across
dehumidier is higher
than 0.4” w.c. for Model
E080 or 0.6” w.c. for Model
E100/E100H.
• Check dehumidier air lter and wash or replace.
• Check for blocked ductwork and clear.
• Verify that the outlet collar with backow damper is installed on the outlet side of the
dehumidier.
• Check if backow damper is blocked or stuck and remove obstruction.
Dehumidier
blower is running
but compressor
is not.
Float Switch open
(E7 appears on display).
• If oat switch is installed, check connections at user interface and empty the
condensate pan.
• If no oat switch is installed, check that the jumper is installed at the oat switch
terminals on the user interface.
Unit is defrosting.
• Frosting occurs when the incoming air is cool and dry, normally during Spring or Fall,
or the airow is restricted. Frosting due to cold/dry conditions is a normal part of
operation and DEFROSTING will show on the display. If it is not cool and dry, look for
blocked ductwork or a dirty lter.
Inlet air temperature is
outside of the 50°F–104°F
range or the dew point
is below 40°F and
there is a demand for
dehumidication.
• Verify all ductwork is properly sealed. Dehumidication will restart by itself when the
incoming air temperature is within range and the dew point is above 40°F. E8 appears
on the display when inlet air conditions prevent operation.
When zoned, the
dehumidier
damper does not
open in INSTALLER
TEST mode.
Incorrect damper wiring
or bad connection.
• Verify wiring between dampers and 24 VAC transformer.
• If wired for Two Zone operation, verify that 24 VAC transformer is 40 VA minimum.
• Check all wiring connections between dampers and user interface.
• Verify the normally closed dampers are in the Primary Zone ductwork and the
normally open dampers are in the Secondary Zone ductwork.
The ventilation
damper does not
open when the
HVAC fan is active.
Cycle time has been met. • The damper will not open if the ventilation time has already been met.
Incorrect transformer
wiring.
• Verify wiring between damper, VENT terminal, and 24 VAC transformer. These should
be wired in series.
• Verify that 24 VAC transformer is 10 VA minimum and voltage is present.
ODT error or outdoor air
outside of ODT range.
• Check that the ODT is wired correctly to the
dehumidier user interface and connections
are secure.
• Check that the ODT is installed in the outdoor
air intake according to the setup specied in
VENTILATION on page 14.
• Remove the ODT leads from the dehumidier
user interface and check the resistance.
Compare the reading with the chart on the
right.
Outdoor
Temperature Resistance
0°F 84,500 Ohms
20°F 46,000 Ohms
40°F 26,000 Ohms
60°F 15,500 Ohms
80°F 9,500 Ohms
100°F 6,000 Ohms
Dehumidier is not
draining properly.
Drain line blocked or unit
not level.
• Verify that the unit is level.
• Check the drain line blockages and check for a continuous downward slope.
• Verify presence and condition of drain cover insert. See MAINTENANCE on page 5 for
cleaning procedure, or replace with Part #5885 if missing or damaged.
The HVAC fan turns
on unexpectedly.
Dehumidier is sampling
or ventilation in progress.
• The dehumidier will turn on the HVAC fan during air sampling or as needed to meet
the ventilation time.
Dehumidier is
producing hot air.
Normal function.
• Air is reheated across the condenser coil, resulting in a temperature rise between inlet
and outlet.
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