User Manual

TABLE 5 – Troubleshooting Guide
Symptom Possible Reason Troubleshooting Procedure
Dehumidifier does not
turn on/run.
No power to unit. • Check that the dehumidifier is plugged in.
• Check that the power switch is turned ON.
• Check that the control is turned ON.
• Check that the circuit breaker has not tripped.
Dehumidifier blower is
running but with little or
no airflow.
Pressure drop across
dehumidifier is higher
than 0.4”w.c. for Model
1830 or 0.6”w.c. for
Model 1850/1850W.
• Check dehumidifier air filter and wash or replace.
• Check for blocked duct work and clear.
• Verify that the outlet collar with backflow damper is installed on the outlet side of the dehumidifier.
• Check if backflow damper is blocked or stuck and remove obstruction.
Dehumidifier blower is
running but compressor
is not.
Float switch open. • If float switch installed, check connections at control board and empty condensate pan.
• If no float switch installed check that the jumper is installed at the float switch terminals on the
control board.
Coil frosting. • Lack of or reduced airflow. Check dehumidifier air filter and wash or replace.
• Check for blocked duct work.
• Inlet air conditions below 60°F. Increase the humidity setting.
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
dehumidification.
• Verify all ductwork is properly sealed.
When zoned, the
dehumidifier 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 control board.
• 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.
ODT error or outdoor air
outside of ODT range.
• Check that the ODT is wired correctly to the
dehumidifier control board and connections are secure.
• Check that the ODT is installed in the outdoor air
intake according to the set-up specified in the
Ventilation Section beginning on page 19.
• Remove the ODT leads from the dehumidifier control
board and check the resistance. Compare the reading
with the table shown.
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
Dehumidifier is not
draining properly.
Drain line blocked or unit
not level.
• Verify that the unit is level.
• Check the drain line blockages and for a continuous downward slope.
The HVAC fan turns on
unexpectedly.
Dehumidifier is sampling
or ventilation in
progress.
• The dehumidifier will turn on the HVAC fan during air sampling or as needed to meet the ventilation
time.
Dehumidifier is
producing hot air.
Normal function. • Air is reheated across the condenser coil, resulting in a temperature rise between inlet and outlet.
TROUBLESHOOTING (CONTINUED)
26