28 - EN
EN - 29
5.5 Access to the T12/T21/T22 sensor
1
1
2
2
3
Remove the bypass flap as instructed in the
relevant section:
■
Set the unit to the service mode;
■
Disconnect the power to the unit;
■
Remove the 3 screws from the front cover;
■
Remove the front cover;
■
Pull on the strap of the heat exchanger.
■
If T21 present: Press temperature sensor T21
upwards, out of the insulation cover next to
the bypass flap;
■
Pull the clamp to the rear of the flap away
from the flap;
■
While holding the clamp away from the flap,
pull the flap towards you.
Loosen the connection joint from the bypass
flap.
Remove the insulation cover behind the bypass
flap.
4
5
6
1
2
Remove the fan connectors of the sensor cover.
Remove the sensor cover by opening the snap
connector.
Remove the connector for the sensor.
Pull the sensor upwards from the rubber holder
for the pressure sensor. Then pull the sensor
sideways from the sensor container.
5.6 Resetting errors
Most errors will automatically reset themselves once the
problem has been resolved.
The following errors can only be reset by a SYSTEM
TEST of the unit:
■
BYPASS MOTOR 11 ERROR;
■
BYPASS MOTOR 20 ERROR;
■
PREHEAT. ERROR;
■
PREHEAT. TOO HOT;
■
PREHEAT. LOC. ERROR.
The filter errors can only be reset in the filter-
replacement menu of the user.
5.7 Carrying out a system test
It is recommended to run system tests regularly because
some errors are only detected during a system test
(e.g. bypass errors). The system test takes about 5-10
minutes. Ensure that during the system test, the unit has
a heat exchanger and that the casing is closed (front
cover fitted). In addition, the HIGH SETTING must be
set to a minimum of 160 m
3
/h and 150 m
3
/h must be
possible in the ventilation system. If that is not the case,
the system test will not be completed without errors.
10001047667-0619-zw-zw-A4 ComfoAir E 350 GEN2 Service Zehnder-SI_EN.indd 29
11-07-19 13:31
