Zehnder Rittling ComfoAir 350, Installer Manual

 21 - EN

 Fasten the screws to a maximum of 1.5 
Nm. This is roughly equal to setting 2 of an 
average battery-powered drill.

9. Carry out the self-test in accordance with menu 

P76.

2.10 Malfunctions

Malfunctions in the ComfoAir are reported as 
follows:

■

  The malfunction alert appears on the display.

■

  The malfunction indicator on the 3-position 

switch lights up;

Malfunction alerts may not appear on the digital 
operating device in all cases, even though there is 
a malfunction (or problem). A concise explanation 
of both types of malfunction (or problem) is given in 
the paragraphs below.

 2.10.1  Malfunction alerts on the digital 

operating device

In the event of a malfunction, the corresponding 
malfunction code will be displayed on the digital 
operating device of the ComfoAir.

Below is a list of the malfunction alerts on the 
digital operating device.
In the chapter about trouble shooting is explained 
how to solve these malfunctions

Code

Description

A0

N/A

A1

NTC sensor T1 is defective.
(= outside air temperature)

A2

NTC sensor T2 is defective.
(= supply air temperature)

A3

NTC sensor T3 is defective.
( =return air temperature)

A4

NTC sensor T4 is defective.
(= exhaust air temperature)

A5

Malfunction in the bypass motor.

A6

Malfunction in the 
Preheater element motor.

A7

Preheater element does not heat sufficiently.

A8

Preheater element becomes too hot

E1

Exhaust fan not rotating.

E2

Supply fan not rotating.

EA2

No communication between the enthalpy sensor 
and the ComfoAir.

,Fil' ,tEr'

Internal Filter is dirty.

2.10.2  3-position switch with 

malfunction indicators

The 3-position switches that are fitted with a 
malfunction indicator show when a malfunction or 
filter dirty alert has occurred. Depending on the type 
of the 3-position switch, this is done in one of the 
following two ways:

■

  3-position switch with malfunction indicator.  

In the event of a malfunction or filter dirty alert 
the indicator lights up; 

■

  Wireless 3-position switch with malfunction 

indicator.  
The malfunction indicators will light up once this 
3-position switch is used. One indicator will light 
up green to indicate communication has been 
established. Subsequently, in the event of a 
malfunctionor filter dirty alert both indicators will 
flash red 3 times. After that, both indicators will 
light up green once more.