22
W
arning
D
Escription
s
olution
W22
Supply airflow
STEP 1: Perform a visual inspection of the supply damper system. Clean filters, distribution
registers and outside supply hood. Inspect ducting to ensure it is not squeezed or bent.
If STEP 1 did not fix the problem, perform STEP 2: Remove ducting of the supply path. On the
LCD screen, select MAX to check if the unit is able to reach the selected flow. If so, review the
ducting path.
If STEP 2 did not fix the problem, perform STEP 3: On the LCD screen, select the MIN and MAX
flow setting values then reset the unit. MAX flow value will display on the LCD screen. If MAX flow
is above desired MAX flow, set MAX and MIN flows.
If STEP 3 did not fix the problem, perform STEP 4: Replace the supply blower and repeat STEP 3.
If STEP 4 did not fix the problem, perform STEP 5: Replace the electronic assembly.
W32
Exhaust airflow
STEP 1: Perform a visual inspection of the exhaust damper system. Clean filters, distribution
registers and outside supply hood. Inspect ducting to ensure it is not squeezed or bent.
If STEP 1 did not fix the problem, perform STEP 2: Remove ducting of the supply path. On the
LCD screen, select MAX to check if the unit is able to reach the selected flow. If so, review the
ducting path.
If STEP 2 did not fix the problem, perform STEP 3: On the LCD screen, select the MIN and MAX
flow setting values then reset the unit. MAX flow value will display on the LCD screen. If MAX flow
is above desired MAX flow, set MAX and MIN flows.
If STEP 3 did not fix the problem, perform STEP 4: Replace the exhaust blower and repeat STEP 3.
If STEP 4 did not fix the problem, perform STEP 5: Replace the electronic assembly.
W52
Initial setting
incomplete
STEP 1: Press + or - to access the selection menu.
STEP 2: Complete configuration. (Refer to section 5 for more details).
W61
Protection mode
electronics
overheating
The unit is currently in protection mode. The power transmitted to the motor is deliberately
reduced to decrease electronics temperature. The unit will exit this mode by itself once conditions
are back to normal. It is normal to observe reduction in airflows during this period. This
condition should appear only when the unit is set in high speed and located in a warmer
environment, for example over 30°C (86°F).
8. INSTALLER’S TROUBLESHOOTING (CONT’D)
CAUTION
Make sure that no piece of mineral wool will enter in the unit during installation. Otherwise, this could reduce airflow and generate
vibrations and noise in the unit.
