Troubleshooting - Fantech SHR 1504 Operation Manual

TROUBLESHOOTING

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