Install Instructions

TROUBLESHOOTING (CONTINUED)
TABLE 6 – Troubleshooting Guide
Symptom Possible Reason Troubleshooting Procedure
Ventilator does not turn
on/run.
No power to unit. • Check that the ventilator 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.
Ventilator blower is
running but with little or
no airflow.
Pressure drop across
ventilator is higher than
0.4”w.c.
• Check ventilator 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 ventilator.
• Check if backflow damper is blocked or stuck and remove obstruction.
Ventilator 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 ventilator 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.
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.
Ventilator 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.
Ventilator is sampling or
ventilation in progress.
• The ventilator will turn on the HVAC fan during air sampling or as needed to meet the ventilation
time.
Ventilator is producing
hot air.
Normal function. • Air is reheated across the condenser coil, resulting in a temperature rise between inlet and outlet.
Display shows “OFF”
even when the ON/OFF
button is pushed.
A manual override
switch has been
installed and has turned
the unit OFF.
• Turn the manual override switch OFF.
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