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22
WARNING DESCRIPTION SOLUTION
W22
Supply airfl ow
STEP 1: Unplug the unit. Perform a visual inspection of the supply damper system. Clean
fi lters, distribution registers and outside supply hood. Inspect ducting to ensure it is not
squeezed or bent. Plug the unit.
If STEP 1 did not fi x 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 fl ow. If so, review the
ducting path.
If STEP 2 did not fi x the problem, perform STEP 3: On the LCD screen, select the MIN and
MAX fl ow setting values then reset the unit. MAX fl ow value will display on the LCD screen. If
MAX fl ow is above desired MAX fl ow, set MAX and MIN fl ows.
If STEP 3 did not fi x the problem, perform STEP 4: Replace the supply blower and repeat
STEP 3.
If STEP 4 did not fi x the problem, perform STEP 5: Replace the electronic assembly.
W32
Exhaust airfl ow
STEP 1: Unplug the unit. Perform a visual inspection of the exhaust damper system. Clean
fi lters, distribution registers and outside exhaust hood. Make sure no non-return damper
is installed in exhaust hood since it can freeze in winter. Inspect ducting to ensure it is not
squeezed or bent. Plug the unit.
If STEP 1 did not fi x 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 fl ow. If so, review the
ducting path.
If STEP 2 did not fi x the problem, perform STEP 3: On the LCD screen, select the MIN and
MAX fl ow setting values then reset the unit. MAX fl ow value will display on the LCD screen. If
MAX fl ow is above desired MAX fl ow, set MAX and MIN fl ows.
If STEP 3 did not fi x the problem, perform STEP 4: Replace the exhaust blower and repeat
STEP 3.
If STEP 4 did not fi x 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 confi guration. (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 airfl ows 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)
Make sure that no piece of mineral wool will enter in the unit during installation. Otherwise, this could reduce
airfl ow and generate vibrations and noise in the unit.
CAUTION
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