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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.
