30 - EN
5.8 What to do if a malfunction alert occurs (problem solving)
Error code
BYPASS MOTOR 11 ERROR / BYPASS MOTOR 20
ERROR
Malfunctions in the motor of the bypass valve on the extract-air / outdoor-air side.
■
For the right-hand unit: BYPASS MOTOR 11 is to the right;
■
For the left-hand unit: BYPASS MOTOR 11 is to the left.
Question
Answer
Action
1
Is the front of the unit closed
(front cover fitted)?
Yes
1. Remove and inspect the bypass valves and motors as described in the section “Maintenance of
the bypass valves”.
2. Go to the next question.
No
Follow the procedure for completing the maintenance.
2
Are the bypass valves and
motors clean?
Yes
1. Ensure that the heat exchanger is in the unit.
2. Switch on the power to the unit.
Make sure that no-one touches rotating parts or parts
under live power.
3. Inspect the bypass valves during startup.
4. Go to the next question.
No
1. Clean the bypass valves and motors.
2. Follow the procedure for completing the maintenance.
3
Do the bypass valves move?
Yes
1. Get the service set for the control PCB.
2. Replace the control PCB as described in the manual supplied.
3. Follow the procedure for completing the maintenance.
No
1. Get the service set for the bypass motor.
2. Replace the bypass motor as described in the manual supplied.
3. Follow the procedure for completing the maintenance.
Error code
FAN 12 ERROR / FAN 22 ERROR
Malfunctions in the fan for the exhaust air / supply air.
■
For the right-hand unit: FAN 12 is to the right;
■
For the left-hand unit: FAN 12 is to the left.
Question
Answer
Action
1
n/a
n/a
1. Remove the electronics cap as described in the section “Access to the control PCB”.
2. Go to the next question.
2
Are all connectors properly
connected to the control
PCB?
(See connection diagram
in the Section “Technical
specifications”)
Yes
1. Inspect the fans as described in the maintenance Section “Maintenance of the fans”.
2. Go to the next question.
No
1. Connect everything as described in the connection diagram in Section “Technical
specifications”.
2. Follow the procedure for completing the maintenance.
3
Are the fan connectors in
the T12/T22 sensor cover
properly connected?
Yes
1. Ensure that the heat exchanger is in the unit.
2. Place a voltmeter over the power connector of the fan (AC: black – blue)
3. Switch on the power to the unit.
Make sure that no-one touches rotating parts or parts
under live power.
4. Go to the next question.
No
1. Connect the fan connectors properly.
2. Follow the procedure for completing the maintenance.
4
If there a voltage of about
230 V on the power
connector?
Yes
1. Get the service set for the fan.
2. Replace the fan as described in the manual supplied.
3. Go to the next question.
No
1. Get the service set for the control PCB.
2. Replace the control PCB as described in the manual supplied.
3. Follow the procedure for completing the maintenance.
5
Did the error alert return?
Yes
1. Get the service set for the control PCB.
2. Replace the control PCB as described in the manual supplied.
3. Follow the procedure for completing the maintenance.
Error code
FILTER ALARM
Internal filters are dirty, you must replace the internal filters.
Action
Replace the filters directly as described in the user manual.
FILTER WARNING
Internal filters are almost dirty, you must replace the internal filters soon.
Action
1. Order new filters.
2. Replace the filters as described in the user manual.
10001047667-0619-zw-zw-A4 ComfoAir E 350 GEN2 Service Zehnder-SI_EN.indd 30
11-07-19 13:31
