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Troubleshooting
SYMPTOM
Poor airflows
Supply air feels cold
Dehumidistat in not
operating
Humidity levels are too high
condensation is appearing
on the windows
Humidity levels are too low
HRV/ERV and/or ducts
frosting up
Condensation or ice build up
in insulated duct to the
outside
Excess water in the bottom
of the HRV
Excessive Vibration
CAUSE
1/4 in (6 mm) mesh on outside hood
is plugged
Filters plugged
Core obstructed
House grills closed or blocked
Dampers are closed if installed
Poor power supply at site
Ductwork is restricting HRV/ERV
Improper speed control setting
HRV/ERV airflow improperly balanced
Poor location of supply grilles, the
airflow may irritate the occupant
Outdoor temperature extremely
cold
Outdoor temperature is above
o
o
15
C (59
F)
Improper low voltage connection
External low voltage is shortened
out by a staple or nail
Check dehumidistat setting it may
be on OFF
Dehumidistat is set too high
HRV/ERV is not sized to handle a
hot tub, indoor pool etc.
Lifestyle of the occupants
Moisture coming into the home
from an unvented or unheated
crawl space
Moisture is remaining in the wash
room and kitchen areas
Condensation seems to form in
the spring and fall
HRV/ERV is set at too low a speed
Dehumidistat control set too low
Blower speed of HRV/ERV is too high
Lifestyle of occupants
HRV/ERV airflows may be improperly
balanced
HRV/ERV airflows are
improperly balanced
Malfunction of the HRV/ERV
defrost system
Incomplete vapor barrier around
insulated duct
A hole or tear in outer duct
covering
Drain pans plugged
Improper connection of HRV's
drain lines
HRV is not level
Drain lines are obstructed
HRV heat exchange core is not
properly installed
Dirt on fan wheels
SOLUTION
Clean exterior hoods or vents
Remove and clean filter
Remove and clean core
Check and open grilles
Open and adjust dampers
Have electrician check supply voltage
Check duct installation
Increase the speed of the HRV/ERV
Have contractor balance HRV/ERV
Locate the grilles high on the walls or under
the baseboards, install ceiling mounted diffuse
or grilles so as not to directly spill the supply
air on the occupant (i.e. over a sofa)
Turn down the HRV/ERV supply speed. A small
duct heater (1 kW) 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
Dehumidistat is functioning normally (see Auto
Dehumidistat Disable in this manual)
Check that the correct terminals have been
used
Check external wiring for a short
Set the dehumidistat at the desired setting
Set dehumidistat lower
Cover pools, hot tubs when they are not in use
Avoid hanging clothes to dry, storing wood and
venting clothes dryer inside. Firewood may have
to be moved outside
Vent crawl space and place a vapor barrier on
the floor of the crawl space
Ducts from the washroom should be sized to
remove moist air as effectively as possible, use
of a bathroom fan for short periods will remove
additional moisture
On humid days, as the seasons change, some
condensation may appear but the homes air
quality will remain high with some HRV/ERV use
Increase speed of the HRV/ERV
Set dehumidistat higher
Decrease HRV/ERV blower speed
Humidity may have to be added through the
use of humidifiers
Have contractor balance HRV/ERV airflows
Note: minimal frost build-up is expected on
cores before unit initiates defrost cycle functions
Have HVAC contractor balance the HRV/ERV
Ensure damper defrost is operating during self-
test
Tape and seal all joints
Tape any holes or tears made in the outer
duct covering, ensure that the vapor barrier is
completely sealed
Look for obstructions in the drain line
Look for kinks in the drain line
Have contractor service HRV/ERV
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