21
E
rror
D
Escription
s
olution
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: Perform a visual inspection of the exhaust damper system. Clean filters,
distribution registers and outside supply hood. Inspect ducting to ensure it is not
squeezed or bent.
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 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 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)
