Installation Manual Serena Series
9.0 Troubleshooting
Problems Possible Causes Solution
1. Airflow is too low ERV airflow is improperly balanced (for units
without built-in Automatic Electronic Air
Balancing)
Filter clogged
Core Obstructed
Exterior fresh air supply blocked
Ductwork is restricted
Power supply is low (low voltage)
Have professional balancer or contractor
balance the unit
Remove and clean filter
Remove and clean core
Remove and clean the blockage
Inspect the duct installation
Switch o the unit immediately and call the
electrician to check the voltage
2. Senses cold air from supply Exhaust hood outside the house is blocked
ERV airflow improperly balanced (for units
without built-in Automatic Electronic Air-
Balancing)
Outdoor temperature is extremely cold
Remove the blockage and clean the hood
Have professional balancer or have a
contractor balance the unit
Placement of furniture or closed door is
restricting the movement of air in the home
Install a duct heater
3. Time switch 20 / 40 / 60 minute /
Intermittent Switch light doesn't stay
on
Loose connection
The switch may be defective
Turn o the ERV breaker
Check connection
Replace the timer switch
Reset the main controller
4. Unit is not defrosting properly Fresh air duct may be frozen
ERV airflow is improperly balanced
Temp. sensor may be defective
Check and remove ice
Have a professional balancer or contractor
balance the unit
Replace the temperature sensor
5. All 3 LEDs of timer switch blink Control board reports error
Lost communication with control board
Refer to problem 4.
Check all wire connections on timer switch
and main control board
6. LEDs on the Main Control Board and
the remote all mount Timer Switch
flashes 0.5 seconds On, 2 seconds
O, then repeats the cycle
Exhaust fan open circuit
a. Motor burned
b. Fan overheated
Replace the motor
Call a technician (if possible, replace the fan)
7. LEDs on the Main Control Board and
the remote wall mount Timer Switch
flashes 0.5 seconds On / 0.5 seconds
O / 0.5 seconds On, then 2 seconds
O, then repeats the cycle
Damper obstructed
Exhaust fan jam/over-current
Check backdraft damper, no screw must
interfere with the function of the damper
Replace the fan
8. LEDs on the Main Control Board and
the remote wall mount Timer Switch
flashes 0.5 seconds On / 0.5 seconds
O / 0.5 seconds On / 0.5 seconds O
/ 0.5 seconds On, 2 seconds O, then
repeats the cycle
Supply fan open circuit
a. Motor burned
b. Fan overheated
Replace the motor
Call a technician (if possible, replace the fan)
9. LEDs on the Main Control Board and
the remote wall Timer Switch flashes
0.5 seconds On / 0.5 seconds O /
0.5 seconds On / 0.5 seconds O /
0.5 seconds On / 0.5 seconds O /
0.5 seconds On, 2 seconds O, then
repeats the cycle
Damper obstructed
Supply fan jam
Check back-draft damper, no screw must
interfere with the function of the damper
Replace the fan
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