Honeywell TrueFRESH ERV/HRV Série Guide D'installation page 40

Troubleshooting (continued)
Problem Possible Cause or
Symptom
• Exhaust Fan • Wiring of fans
activated incorrect on HVC
Supply Fan off. Controller
• Unit is in its
automatic defrost
sequence when
defrost thermister
measures
temperature of
-5ºC/23ºF
• T-3 Timers not • T-3 timer wires
functioning, the connections do not
LED remains correspond to the
on with a dim Speed Control™. (G
green light. & B connections are
• T-3 Timers not inverted)
functioning, • HRV/ERV does not
display LED operate or respond.
light doesn't
appear.
Air is too dry Air is too dry
Air is too humid Air is too humid
38
Test Procedure
• 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.
• Disconnect all wall controls
from unit.
• Override TIMER (R & G)
connections of the Speed
Control™.
TrueFRESH™ ERV/HRV Ventilation Systems 69-2480EF—13
Solution
• 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.
• Ensure all wall controls
wire connection
correspond to the Speed
Control™ connections.
(Example: B B / G G / R R
) (Ref: Wall Control Section
of the Installation Guide.)
1. Increase humidity level
on the dehumidistat.
2. Switch ventilation mode
from continuous to
intermittent.
3. Install a humidifier.
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 30).