Viessmann Vitotronic 100 GC1 Installation And Service Instructions Manual page 97

Faults displayed at the programming unit
Fault
System characteristics
code
b b b b 8 8 8 8 Control mode
b b b b f f f f
c c c c 1 1 1 1
Boiler cools down
c c c c 4 4 4 4
Control mode
c c c c 8 8 8 8 Boiler cools down
c c c c 9 9 9 9
c c c c a a a a Boiler cools down
c c c c b b b b
Boiler cools down
c c c c e e e e
Control mode
c c c c f f f f
d d d d 1 1 1 1
Boiler cools down
d d d d 4 4 4 4
Control mode
d d d d 6 6 6 6
d d d d 7 7 7 7
d d d d 8 8 8 8
(cont.)
Cause
Flue gas temperature sensor open
circuit
Incorrect LON communication
module
External safety device
Input Module
0 to 10V incorrectly connected
Error
Low water cut off device
Error
Maximum pressure limiter
Error
Minimum or maximum pressure
limiter 2
Error
External fixed high limit or
temperature limiter
Communication error
Plug-in adaptor for external safety
equipment
Error
LON communication module
Burner fault
Fixed high limit has responded or
fuse F2 has blown
Fault in plug-in adaptor for external
safety equipment:
to DE1
to DE2
to DE3
Troubleshooting – Vitotronic 100, GC1
Remedy
Check flue gas temperature sensor
(see page 124)
Replace communication module
(see page 121)
Check connection on plug aBÖ and
external safety equipment
Connect Input Module 0 to 10 V to
Vitotronic 300-K, MW1S and set
coding 9d : 0 on Vitotronic 100
Check water level of system; reset
low water cut-off device
(see page 39)
Check system pressure; reset
maximum pressure limiter
Check system pressure; reset
minimum or maximum pressure
limiter
Check system temperature; reset
fixed high limit (see page 31)
Check plug-in adaptor for external
safety equipment and connecting
cable
Without plug-in adaptor:
Set coding 94 : 0
Replace communication module
(see page 121)
Check burner
Check fixed high limit or burner,
burner loop and fuse F2
(see page 31)
Check electrical connections on DE1
to DE3
97