34 - EN
Error code
PREHEAT. LOC. ERROR
The preheater is not at the correct location, is defective or absent.
■
For the right-hand unit: PREHEATER and T21 are to the left;
■
For the left-hand unit: PREHEATER and T21 are to the right.
Question
Answer
Action
1
Is the front of the unit closed
(front cover fitted)?
Yes
Go to the next question.
No
Follow the procedure for completing the maintenance.
2
Is there a FAN 22 ERROR or
TEMP SENSOR 21 ERROR?
Yes
Solve the error as per the relevant resolution table.
No
1. Open the designer front as described in the step 1 of the malfunction Section “Access to the
control PCB”.
2. Go to the next question.
3
Is the preheater located on
the correct side?
Yes
Go to the next question.
No
1. Change the location of the preheater as described in the malfunction Section “Change the
location of the preheater”.
2. Follow the procedure for completing the maintenance.
4
Is the separator of
temperature sensor T21
clicked into the insulation
cover?
Yes
1. Remove the electronics cap as described in the section “Access to the control PCB”.
2. Go to the next question.
No
1. Place temperature sensor T21 properly in the insulation cover beside the bypass valve. How to
get access to this sensor can be found in the maintenance Section “Maintenance of the bypass
valves”.
2. Follow the procedure for completing the maintenance.
5
Are all connectors properly
connected to the control
PCB?
(See connection diagram
in the section “Technical
specifications”)
Yes
1. Place a resistance meter over the connector of the preheater (blue – brown, and blue – black).
2. Go to the next question.
No
1. Connect everything as described in the connection diagram in the section “Technical
specifications”.
2. Follow the procedure for completing the maintenance.
6
Does the preheater give an
infinite resistance?
Yes
1. Get the service set for the preheater.
2. Replace the preheater as described in the manual supplied.
3. Follow the procedure for completing the maintenance.
No
1. Get the service set for the control PCB.
2. Replace the control PCB as described in the manual supplied.
3. Follow the procedure for completing the maintenance.
10001047667-0619-zw-zw-A4 ComfoAir E 350 GEN2 Service Zehnder-SI_EN.indd 34
11-07-19 13:31
