Fantech SHR 1504 Operation Manual - Troubleshooting
7
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.
– HRV out of balance
– Have contractor balance HRV airflows
Air is too humid
– Dehumidistat control is set too high
– Reduce the desired level of humidity. Combine this with the use of continu-
ous 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.
– HRV out of balance
– Have contractor balance HRV airflows
– 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.
– HRV out of balance
– Have contractor balance HRV
– 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 filter
– 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 airflow
– Check duct installation
– Improper speed control setting
– Increase the speed of the HRV (i.e. change unit control from LOW to MED speed)
– HRV airflow improperly balanced
– Have contractor balance HRV airflows
– Ducting has fallen down or been disconnected from HRV – Have contractor reconnect ducting
Supply air feels cold
– Poor location of supply grilles, the airflow 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 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
– 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
HRV and/or Ducts frosting up
– HRV air flows are improperly balanced
– Have HVAC contractor balance the HRV airflows
– Malfunction of the HRV defrost system
– Note: minimal frost build-up is expected on cores 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.
Green LED Light Codes on
Control Board
Constant Flash
– Everything is in good operations
Light is ON, and not Flashing
– Control Board is defective
– Replace Control Board
Light is OFF, and not Flashing
– 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 certified HVAC Contractor/Technician.