User Guide

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7 TROUBLESHOOTING
Refer to the following table for troubleshooting your HRV unit.
Table 5.1 – Troubleshooting Procedures
SYMPTOM
CAUSE
SOLUTION
Flashing light on the
timer and/or main
control
• Usually a wiring, voltage, or
communication error.
• Cycle the power by turning off and
disconnecting the unit for 30 seconds, then
reconnect and turn it on. If the problem
persists, contact your service contractor.
Note
•
Some older style controls will display
flashing lights to indicate that a mode,
such as defrost, has been enabled.
Poor airflows
• 1/4 in (6 mm) mesh on outside hood
is plugged
• Filters plugged
• Core obstructed
• House grilles closed or blocked
• Dampers are closed if installed
• Poor power supply at site
• Ductwork is restricting HRV
• Improper speed control setting
• HRV airflow improperly balanced
• 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
• Have contractor balance HRV
Supply air feels cold
• Poor location of supply grilles, the
airflow may irritate the occupant
• Outdoor temperature extremely cold
• Locate the grilles high on the walls or under
the baseboards, install ceiling mounted
diffuser or grilles so as not to directly spill
the spill 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 the furnace
return, the furnace fan may need to run
continuously to distribute ventilation air
comfortably
Dehumidistat in not
operating
• Outdoor temperature is above 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 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