17
TROUBLESHOOTING
Problem Causes Solutions
Air is too dry Dehumidistat control is set too low Increase the desired level of humidity. Change ventilation mode from
continuous mode to standby.
FAA out of balance Have contractor balance FAA airows
Air is too humid Dehumidistat control is set too high Reduce the desired level of humidity. Combine this with the use of continuous
exchange mode.
Sudden change in temperature Wait until outside temperature stabilizes (winter). Heating will also improve
situation.
Storing too much wood for heating Store a majority of your wood outside. Even dried, a cord of wood contains
more than 20 gallons of water.
Dryer vent exhaust is inside home Make sure the dryer vent is exhausting outside.
Poor air circulation near windows Open curtains or blinds.
FAA out of balance Have contractor balance FAA airows
Well sealed basement door is closed Open the door or install a grill on the door.
Failed damper system may be stuck in recirculation
mode
Check defrost damper. If damper is always blocking incoming fresh air, have
contractor verify damper system.
Persistent condensation
on window
Improper adjustment of dehumidistat control Reduce the desired level of humidity. Combine this step with use of continuous
exchange mode.
FAA out of balance Have contractor balance FAA
Poor air circulation near windows Open curtains or blinds.
Poor Air Flows 1/4" (6mm) mesh on the outside hoods is plugged Clean exterior hoods or vents
Filters plugged Remove and clean lter
Core obstructed Remove and clean core
Indoor grilles closed or blocked Check and open grilles
Inadequate power supply at site Have electrician check supply voltage
Ductwork is restricting airow Check duct installation
Improper speed control setting Increase the speed of the FAA (i.e. change unit control from REDUCED to NORMAL
speed)
FAA airow improperly balanced Have contractor balance FAA airows
Ducting has fallen down or been disconnected from FAA Have contractor reconnect ducting
Supply air feels cold Poor location of supply grilles, the airow may irritate
the occupant
Locate the grilles high on the walls or under the baseboards, install ceiling
mounted diffuser or grilles so as not to directly spill the supply air on the
occupant (eg. Over a sofa)
Turn down the FAA supply speed. A small duct heater (1kw) could be used to
temper the supply air
Placement of furniture or closed doors is restricting the movement of air in
the home
Outdoor temperature extremely cold If supply air is ducted into furnace return, the furnace fan may need to run
continuously to distribute ventilation air comfortably
FAA and/or Ducts frosting up FAA air ows are improperly balanced Have HVAC contractor balance the FAA airows
Malfunction of the FAA defrost system Note: minimal frost build-up is expected on the core before unit initiates
defrost cycle functions
Condensation or Ice Build Up in
Insulated Duct to the Outside
Incomplete vapor barrier around insulated duct Tape and seal all joints
A hole or tear in outer duct covering Tape any holes or tears made in the outer duct covering
Ensure that the vapor barrier is completely sealed.
LED is ashing Everything is in good operations
LED is not ashing No Power is being transmitted to the Control Board Make sure unit is plugged.
Transformer may need replacing.
Note: It is best to get the unit checked by a certied HVAC Contractor/Technician.
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