Broan B150H75NS User's And Installer's Manual page 22

8. INSTALLER'S TROUBLESHOOTING (CONT'D)
W D
ARNING ESCRIPTION
W22 Supply airfl ow
W32 Exhaust airfl ow
W52 Initial setting
incomplete
W61 Protection mode
electronics
overheating
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.
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.
STEP 1: Press + or - to access the selection menu.
STEP 2: Complete confi guration. (Refer to section 5 for more details).
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.
S
OLUTION
22