Fault Codes - Viessmann VITODENS 222-F Service Instructions Manual

Vitodens 222-F B2TB 19 and 35 Service
Fault Display
In the event of a fault, red fault indicator A flashes. "
flashes on the display and "Fault" is shown.
The fault code is displayed with OK. For an explanation
of the fault code, see the following pages.
For some faults, the type of fault is also displayed in
plain text.

Fault Codes

Fault code Detailed fault
on display code*2
0F -
10 -
18 -
20 -
28 -
*1 Control mode: Boiler/burner fully operational (fault code must be verified and reset).
Burner in fault mode: Boiler control requires manual reset before burner can resume operation.
Burner blocked: If fault cause is corrected, burner resumes operation.
*2 Detailed fault code coding address 38:xx (if available).
PSI
System behavior*1
Control mode
Boiler operates based on
outdoor temperature of
32° F (0°C)
Boiler operates based on
outdoor temperature of
32° F (0°C)
Regulates without supply
temperature sensor
(low-loss header)
Regulates without supply
temperature sensor
(low-loss header)
 Acknowledging a fault
"
Follow the instructions on the display.
Note: The fault message is transferred to the standard
menu. A fault message facility, if connected, will
be switched OFF. If an acknowledged fault is not
remedied, the fault message will be re-displayed
the following day and the fault message facility
restarted.
Calling up acknowledged faults
Select "Fault" in the standard menu.
The current faults will be displayed in a list.
Calling up fault codes from the fault memory (fault history)
The 10 most recent faults (including resolved ones) are
saved and can be called up.
Faults are sorted by date.
1. Press OK and
4 seconds
2. "Fault history"
3. "Display?"
Cause
Code "0F" is only
displayed in the fault
history
Short circuit on outdoor
temperature sensor
Outdoor temperature
sensor cable broken
Short circuit on system
flow temperature sensor
System supply
temperature sensor cable
broken
Troubleshooting
simultaneously for approximately
Corrective action
Service required
Note: After servicing select
code "24:0"
Check the outdoor temperature
sensor (see page 78).
Check the outdoor temperature
sensor (see page 78).
Check the low-loss header
sensor (see page 79).
Check the low-loss header
sensor (see page 79). If no
low loss header sensor is
connected, set code 52:0.
69