Viessmann Vitotronic 100 Installation And Service Instructions Manual page 50

Troubleshooting
Fault display
(cont.)
Displayed fault System characteristics
code
b8 Control mode
b9 Control mode
C1 Control mode
C2 Control mode
Cd Control mode
d1 Boiler cools down.
d6 Control mode
d7 Control mode
d8 Control mode
Faults that are not displayed at the programming unit
Boiler cold, burner does not start
Enable emissions test function (see operating instructions).
The pumps connected at the control unit are not running
Check the operating voltage (mains isolator, power cable, plug
■
Fuse F1 faulty:
■
1. Pull out all 230 V plugs from the control unit (pumps, burner).
2. Replace the F1 fuse.
3. To determine the faulty device, reconnect all 230 V devices in sequence, until the faulty device is identified.
Pumps are running
Is plug live between L1 and N?
fA
No
Check plug , burner connecting
fA
cable and high limit safety cut-out,
as well as any other limiters (low wa-
ter indicator, pressure limiter, etc.)
that may be installed.
50
Cause
Lead break, flue gas tem-
perature sensor
Internal fault
Communication error,
EA1 extension
Lead break, KM-BUS to
solar control module, type
SM1 or to the Vitosolic
Communication error
Burner fault
Input DE1 at EA1 exten-
sion reports a fault
Input DE2 at EA1 exten-
sion reports a fault.
Input DE3 fault at EA1 ex-
tension
Yes
The fault is unlikely to be due to the control unit; instead the burner termi-
nal area or the burner itself may be the cause: Is terminal T1 of plug
live when connected?
No
Check any burner equipment
(fuses, gas pressure switch, etc.).
Measures
Check flue gas temperature sensor
(see page 51).
Without flue gas temperature sen-
sor:
Set code "1F:0" in group 2 "Boiler".
Acknowledge fault message, re-
peat data input.
Check connections (see
page 65).
Without EA1 extension:
Set code "35:0" in group 1 "Gener-
al".
Check KM-BUS cable and appli-
ance.
Without solar control unit:
Set code "54:0" in group 1 "Gener-
al".
Set code "95:0".
Check the burner.
Remedy fault at appliance con-
cerned.
Remedy fault at appliance con-
cerned.
Remedy fault at appliance con-
cerned.
, ON/OFF switch, fuse F1, 6.3 A (slow)).
fÖ
Yes
Check the temperature controller;
the burner must start in accordance
with the selected delay (e.g. oil pre-
heating). If the burner is still not op-
erating, repeat the previous checks.
It may be that faulty accessories are
preventing the burner from starting.
fA