Installation

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Appendix I
TROUBLESHOOTING
SYMPTOMS POSSIBLE CAUSES SOLUTIONS
Inside air is too dry Over ventilation - speed setting too high
Dehumidistat setting is too low
Adjust speed setting
Set dehumidistat control in a higher position
(if applicable)
Persistent condensation on windows, walls,
ceilings, etc.
Improper adjustment of dehumidistat
control
Improper ventilation rate
Window frame is too cold or leaky
Adjust dehumidistat control knob to a lower
setting
Install a dehumidistat (option)
Repair window frame
Unit stops functioning Electrical supply interrupted Check the unit circuit breaker
Air from supply diffusers too cold Imbalance of supply and exhaust air
Outdoor temperature very cold
Check filters and cores for blockage
Check balance of airflows
Install electric duct heater if necessary
Unit makes annoying noise Blower wheel out of alignment Remove the motor/blower assembly
and adjust blower wheel
Core freezing up Imbalance of supply and exhaust air
Defrost damper not functioning
Check filters and cores for blockage
Check balance of airflows
Check for operation of both defrost damper
actuators
For technical assistance and warranty information,
please call your local supplier.