Zehnder Rittling ComfoAir Q, Installer Manual, Page: 30 / 52

30 - EN
9. Malfunction procedures
Always disconnect the power supply of the unit
before you start working on the unit. The unit
can cause personal injury when it is open while
running. Make sure the unit cannot switch back
on by accident.
Always take ESD-inhibiting measures when
dealing with electronics, such as wearing an
antistatic wristband. The electronics can get
damaged by static charges.
In the chapter what to do in the event of a
malfunction alert (troubleshooting) you can find how
to solve all malfunction codes.
9.1 How to gain access to the ComfoNet connectors on the unit
1 2 3
1 2 3
Open the semi-transparent visor. Pull the cable tray cover forwards. 1 = ComfoNet plug-in connection
2 = ComfoNet plug-in connection
3 = ComfoNet RJ45 connection
9.2 How to gain access to the control PCB
1 2 3
Open the semi-transparent visor. Unscrew the 3 screws of the front
cover. Remove the front cover.
4 5 6
Pull the cable tray cover forwards. Unscrew the 2 screws of the display
cover. Open the display cover.