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TROUBLESHOOTING
Table 1. Troubleshooting Guide.
Symptom
Cause
Poor airflow
•
•
•
•
•
•
•
•
•
Supply air
•
feels cold
•
•
Dehumidistat
•
is not
•
operating
•
•
18
Plugged outside hood 1/4 in. (6 mm) mesh.
Filters plugged.
Core obstructed.
House grilles closed or blocked.
Dampers (if installed) are closed.
Poor power supply at site.
Ductwork is restricting airflow.
Improper speed control setting.
Ventilator airflow improperly balanced.
Poor location of supply grilles, airflow can
irritate the occupant.
Outdoor temperature extremely cold.
Ventilator airflow can be incorrectly balanced.
Incorrect connection to external 24-volt control.
Staple/nail is shorting out external low voltage.
Check dehumidistat setting; it could be at Off.
Dehumidistat is disabled when the outdoor
temperature is above 60F for 24 hours.
HR150, 200; ER150, 200 Perfect Window™ Fresh Air Ventilation Systems 68-0171—12
Solution
•
Clean exterior hoods or vents
•
Remove and clean filter.
•
Remove and clean core.
•
Check and open grilles.
•
Open and adjust dampers
•
Have electrician check supply voltage at house.
•
Check duct installation.
•
Increase speed of ventilator.
•
Have contractor balance ventilator airflow.
•
Locate grilles high on walls or under baseboard
heaters; install ceiling-mounted diffuser or
grilles to avoid blowing directly on occupants
(example: over a sofa).
•
Turn down ventilator supply speed.
•
Use a small duct heater (1 kW) to temper the
supply air.
•
Placement of furniture or closed doors is
restricting movement of air in the home.
•
If supply air is ducted in furnace return, run
furnace fan continuously to distribute ventilation
air comfortably.
•
Have a contractor balance ventilator airflow.
•
Check that correct wires were used.
•
Check external wiring for a short.
•
Set dehumidistat at the desired setting.
•
Check the LED on the terminal block for long
flash followed by a short flash.
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