Zehnder Rittling ComfoAir 180, Manual

Page: 26 / 32

26 - EN
6.5 What to do in the event of a malfunction / troubleshooting
The unit has two types of reset function. These reset functions can be activated in P-menus P74 and P75. P-menu
P74 is a soft reset used for resetting malfunction codes. P-menu P75 is a hard reset for resetting the set values of
all the P-menus. After using the P-menu P75 reset all P-menus must be checked and set to the right value and all
wireless devices need to be paired to the unit.
Malfunction code / / /
NTC sensor T1/T2/T3/T4 is defective
Question Answer Action
1 Was the temperature
< -27ºC or > 127ºC? Yes Reset the unit (P74 on 1)
No
1. Reset the unit (P74 on 1)
2. Go to the next question.
2 Did the malfunction code reappear? Yes 1. Access the control PCB as described in the
introduction of the malfunction chapters.
2. Go to the next question.
3 Are the connections at the control PCB
correct?
(See the schematics in the technical
specification chapter)
Yes
1. Remove the NTC sensor from the control PCB.
2. Go to the next question.
No
Reconnect the NTC sensor
4 Is the resistance of the NTC sensor
correct?
(See the specifications in the technical
specification chapter)
Yes
1. Get the control PCB service set
2. Replace the control PCB
No
1. Get the repair kit for the NTC sensor
2. Replace the NTC sensor
Malfunction code
Malfunction in the bypass motor
Question Answer Action
1 n/a
n/a
1. Access the control PCB as described at the
introduction of the malfunction chapters.
2. Turn on the power of the unit.
Risk of electrocution.
3. Activate the self-test (P76 on 1)
4. Go to the next question.
2 Did the motor run?
Yes
1. Disconnect the power from the unit.
2. Remove the motor.
3. Go to the next question.
No
1. Disconnect the power from the unit.
2. Go to the last question.
3 Is the motor cog defective? Yes Replace the cog of the motor.
No
1. Get the bypass motor service set.
2. Replace the motor.
4 Was there 8VDC power present on the
motor?
Yes
1. Get the bypass motor service set.
2. Replace the motor.
No
1. Get the control PCB service set.
2. Replace the control PCB.