Troubleshooting (continued)
Problem
Possible Cause or
Symptom
Test Procedure
Solution
• Exhaust Fan
activated
Supply Fan
off.
• Wiring of fans
incorrect on HVC
Controller
• Unit is in its
automatic defrost
sequence when
defrost thermister
measures
temperature of
-5ºC/23ºF
• Unplug unit, remove access
panel from Exhaust Fan (right
motor mount) . Ensure all
connections on HVC & LVC
board correspond to wiring
diagram and that they are
securely in place.
• Wait 5 to 10 minutes to ensure
unit has completed the defrost
sequence.
• Ensure wiring
corresponds to wiring
diagram.
• Test the defrost
thermister with Ohm
meter.
• Insure unit completes
the defrost sequence is
temperature are below -
5°C/23°F.
• T-3 Timers not
functioning,
the LED
remains on
with a dim
green light.
• T-3 Timers not
functioning,
display LED
light doesn’t
appear.
• T-3 timer wires
connections do not
correspond to the
Speed Control™. (G
& B connections
are inverted)
• HRV/ERV does not
operate or respond.
• Disconnect all wall controls
from unit.
• Override TIMER (R & G)
connections of the Speed
Control™.
• Ensure all wall controls
wire connection
correspond to the
Speed Control™
connections.
(Example: B
u
B / G
u
G /
R
u
R ) (Ref: Wall Control
Section of the Installation
Guide.)
Air is too dry
Air is too dry
1. Increase humidity level
on the dehumidistat.
2. Switch ventilation
mode from continuous
to intermittent.
3. Install a humidifier.
Air is too humid
Air is too humid
1. Reduce the humidity
level on the controller.
2. Make sure that the
clothes dryer is vented
to the outdoors.
3. Wait for outside
temperature to change.
For example, it can be
very humid at times in
the summer.
4. Verify balancing of the
ERV/HRV unit (see
Balancing Steps on
page 29).
ERV/HRV Ventilation Systems 69-2480EF—19
37
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