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T
ROUBLESHOOTING
Refer to the following table for troubleshooting the HRV/ERV unit.
Table 17.1
–
Troubleshooting Procedures (cont.)
SYMPTOM
CAUSE
SOLUTION
Humidity levels are too
low
•
Dehumidistat control set too low
•
Blower speed of HRV/ERV is too
high
•
Lifestyle of occupants
•
HRV/ERV airflows may be
improperly balanced
•
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
HRV and/or ducts frosting
up
•
HRV/ERV airflows are improperly
balanced
•
Malfunction of the HRV/ERV
defrost system
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
Condensation or ice
buildup in insulated duct
to the outside
•
Incomplete vapor barrier around
insulated duct
•
A hole or tear in outer duct
covering
•
Tape and seal all joints
•
Tape any holes or tears made in the outer
duct cover, ensure that the vapor barrier is
completely sealed.
Excess water in the
bottom of the HRV
•
Drain pans plugged
•
Improper con
nection of HRV’s
drain lines
•
HRV is not level
•
Drain lines are obstructed
•
HRV heat exchange core is not
properly installed
•
Look for obstructions in the drain line
•
Look for kinks in the drain line
Excessive Vibration
•
Dirt on fan wheels
•
Have contractor service HRV/ERV