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function
error or malfunction
location
visualisation
action
ComfoNet
no connection between CM
and VM-PCB
web server and
LED
web server: brief description of
the error and of the possible
cause
LED: ComfoNet LED flashes
fast
N/A
error code received from VM
Web server and
LED
web server: display the
received error code
LED: the error LED is on
(critical error)
N/A
Modbus
Modbus connection error
web server and
LED
web server: brief error
description
LED: Modbus LED flashes fast
(e.g. internal fault,
communication fault,
configuration fault)
N/A
operating
system
failed to achieve flow set
point within 10 minutes
web server and
LED
web server: brief description of
error
LED: error LED is on
(critical error)
N/A
difference between supply
and extraction air flows is
more than 2.5% for a basic
system and more than 5% for
a connect system
web server and
LED
web server: brief description of
the error and of the possible
cause (e.g. open windows
and/or doors)
LED: the error LED is on
(non-critical error)
N/A
update
update not successful
LED
all LEDs on the CM-PCB are
flashing
N/A
self-test
failed to run self-test
web server
brief description of the fault
and its possible cause (e.g. no
VMs, system not yet
commissioned)
(critical error)
restart the self-test until it is
successful
everything
general undefined and
non-critical errors (e.g. too
high current)
web server and
LED
Web server: provide as much
information as possible
LED: the error LED is on
(non-critical error)
N/A
10001124369-0123-zw-zw-A4 ComfoVar Aero Installer_Service Zehnder-General_BOOK_2.indb 61
10001124369-0123-zw-zw-A4 ComfoVar Aero Installer_Service Zehnder-General_BOOK_2.indb 61
24-01-2023 11:11
24-01-2023 11:11