Technical data

Vitodens 200-W B2HA 19, 28, 35 Service
71
5683 702 - 07
Fault Codes
Troubleshooting
In the event of a fault, red fault indicator A flashes. “  “
flashes on the display and “Fault” is shown.
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
simultaneously for approximately
4 seconds
2. “Fault history”
3. “Display?”
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.
PSI
*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.
Fault code on display System behavior*1 Cause Corrective action
0F Control mode Code “0F” is only
displayed in the fault
history
Service required
Note: After servicing select
code “24:0”
10 Boiler operates based on outdoor
temperature of 32° F (0° C)
Short circuit on outdoor
temperature sensor
Check the outdoor temperature
sensor (see page 79).
18 Boiler operates based on outdoor
temperature of 32° F (0° C)
Outdoor temperature
sensor cable broken
Check the outdoor temperature
sensor (see page 79).
1A
NOT USED
Burner blocked Flow sensor 1 faulty Replace sensor (see page 80)
1B
NOT USED
Burner blocked Flow sensor 2 faulty Replace sensor (see page 80)
1F
NOT USED
Burner blocked Differential flow rate
too large
Clean heat exchanger by
flushing
20 Regulates without supply
temperature sensor
(low-loss header)
Short circuit on system
flow temperature sensor
Check the low-loss header
sensor (see page 80).
28 Regulates without supply
temperature sensor
(low-loss header)
System supply
temperature sensor
cable broken
Check the low-loss header
sensor (see page 80). If no
low loss header sensor is
connected, set code 52:0.
30 Burner blocked Short circuit on boiler
water temperature
sensor
Check the boiler water
temperature sensor
(see page 80).
38 Burner blocked Boiler water temperature
sensor cable broken
Check the boiler water
temperature sensor
(see page 80).