User Guide

WARNING DESCRIPTION SOLUTION

W22 Supply air ow

STEP 1: 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.

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 air ow

STEP 1: Perform a visual inspection of the exhaust damper system. Clean ﬁ lters, distribution

registers and outside supply hood. Inspect ducting to ensure it is not squeezed or bent.

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 located in a warm environment, for example over

60°C (140°F). If this condition appears while the unit is located in an environment where the

ambient temperature is under 30°C (86°F), replace the electronic assembly.

8. INSTALLER’S TROUBLESHOOTING (CONT’D)