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22
ERROR DESCRIPTION SOLUTION
E26 Supply motor (drive over temp) STEP 1: Validate if the air exchanger is exposed to ambient temperatures within
the operating limits (see p. 4)
If STEP 1 did not fix the problem, perform STEP 2: Replace the electronic assembly.
E32 Exhaust airflow STEP 1: Unplug the unit. Perform a visual inspection of the exhaust damper
system. Clean filters, 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 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.
E33 Exhaust motor (drive over current) STEP 1: Unplug/plug the unit.
If STEP 1 did not fix the problem, perform STEP 2: Remove core and clear the
ventilation wheel from any dirt or obstacles.
If STEP 2 did not fix 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 fix the problem, perform STEP 4: Replace the electronic assembly.
E37 Exhaust motor (drive foc duration)
E38 Exhaust motor (drive speed
feedback)
E39 Exhaust motor (startup)
E34 Exhaust motor (drive over voltage) STEP 1: Unplug/plug the unit. Under and over voltage may be detected with
severe in-house power supply fluctuation and stop the motor for protection.
If STEP 1 did not fix the problem, perform STEP 2: Replace the electronic assembly.
E35 Exhaust motor (drive under voltage)
E36 Exhaust motor (drive over temp) STEP 1: Validate if the air exchanger is exposed to ambiant temperatures within
the operating limits (see p. 4)
If STEP 1 did not fix the problem, perform STEP 2: Replace the electronic assembly.
E40 Outside air thermistor STEP 1: Check if thermistor is well connected in connector J7A.
If STEP 1 did not fix 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 fix the problem, perform STEP 3: Replace the electronic assembly.
E41 Distribution air thermistor STEP 1: Check if thermistor is well connected in connector J7B.
If STEP 1 did not fix 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 fix the problem, perform STEP 3: Replace the electronic assembly.
E42 PCBA thermistor fault STEP 1: Replace the electronic assembly.
E43 PCBA temperature over limit STEP 1: Validate if the air exchanger is exposed to ambiant temperatures within
the operating limits (see p. 4)
If STEP 1 did not fix the problem, perform STEP 2: Replace the electronic assembly.
E50 Wall control communication lost STEP 1: Unplug unit, inspect wires, plug unit.
If STEP 1 did not fix 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 fix 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 fix the problem, perform STEP 4: Replace the electronic assembly.
E51 Wall control sensor STEP 1: Unplug unit, inspect wires, plug unit.
If STEP 1 did not fix the problem, perform STEP 2: Replace the wall control.
E60 Protection mode STEP 1: Perform general inspection of the unit (dampers, core, filters).
8. INSTALLER’S TROUBLESHOOTING (CONT’D)
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