Broan B150H75NS User's And Installer's Manual page 21

8. INSTALLER'S TROUBLESHOOTING (CONT'D)
E D
RROR ESCRIPTION
E26 Supply motor (drive over temp)
E32 Exhaust airfl ow
E33 Exhaust motor (drive over current)
E37 Exhaust motor (drive foc duration)
E38 Exhaust motor (drive speed
feedback)
E39 Exhaust motor (startup)
E34 Exhaust motor (drive over voltage)
E35 Exhaust motor (drive under voltage)
E36 Exhaust motor (drive over temp)
E40 Outside air thermistor
E41 Distribution air thermistor
E42 PCBA thermistor fault
E43 PCBA temperature over limit
E50 Wall control communication lost
E51 Wall control sensor
E60 Protection mode
STEP 1: Validate if the air exchanger is exposed to ambient temperatures within
the operating limits (see p. 4)
If STEP 1 did not fi x the problem, perform STEP 2: 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: Unplug/plug unit.
If STEP 1 did not fi x the problem, perform STEP 2: Remove core and clear the
ventilation wheel from any dirt or obstacles.
If STEP 2 did not fi x the problem, perform STEP 3: Disconnect J3 (red) and
connect a spare blower system. If it works, replace exhaust blower.
If STEP 3 did not fi x the problem, perform STEP 4: Replace the electronic assembly.
STEP 1: Unplug/plug unit. Under and over voltage may be detected with severe
in-house power supply fl uctuation and stop the motor for protection.
If STEP 1 did not fi x the problem, perform STEP 2: Replace the electronic assembly.
STEP 1: Validate if the air exchanger is exposed to ambiant temperatures within
the operating limits (see p. 4)
If STEP 1 did not fi x the problem, perform STEP 2: Replace the electronic assembly.
STEP 1: Check if thermistor is well connected in connector J7A.
If STEP 1 did not fi x the problem, perform STEP 2: Disconnect connector J7A and
check if the measured resistance (thermistor connector) is within 5 Kohms to
120 Kohms. If outside the range, replace the thermistor.
If STEP 2 did not fi x the problem, perform STEP 3: Replace the electronic assembly.
STEP 1: Check if thermistor is well connected in connector J7B.
If STEP 1 did not fi x the problem, perform STEP 2: Disconnect connector J7B and
check if the measured resistance (thermistor connector) is within 5 Kohms to
120 Kohms. If outside the range, replace the thermistor.
If STEP 2 did not fi x the problem, perform STEP 3: Replace the electronic assembly.
STEP 1: Replace the electronic assembly.
STEP 1: Validate if the air exchanger is exposed to ambiant temperatures within
the operating limits (see p. 4)
If STEP 1 did not fi x the problem, perform STEP 2: Replace the electronic assembly.
STEP 1: Unplug unit, inspect wires, plug unit.
If STEP 1 did not fi x the problem, perform STEP 2: Remove wall control from the
wall installation and test with a short cable. If it works, bring a new cable to the
wall installation location.
If STEP 2 did not fi x the problem, perform STEP 3: Test the air exchanger with a
spare wall control. If it works, replace the wall control.
If STEP 3 did not fi x the problem, perform STEP 4: Replace the electronic assembly.
STEP 1: Unplug unit, inspect wires, plug unit.
If STEP 1 did not fi x the problem, perform STEP 2: Replace the wall control.
STEP 1: Perform general inspection of the unit (dampers, core, fi lters).
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OLUTION