Operating instructions
119
Troubleshooting
Faults which are displayed at the programming unit (cont.)
Fault
code
System
characteristics
Cause Remedy
ce
Control mode Communication
fault plug−in
adaptor for external
safety equipment
Check plug−in
adaptor for external
safety equipment
(see page 135) and
connecting cable.
Without plug−in
adaptor, set code
"94:0"
cf
Fault
LON
communication
module
Replace
communication
module
(see page 128).
Without
communication
module
Set code "76:0"
d1
Boiler cools down Burner fault Check burner
(see page 89)
d4
High limit safety
cut−out has
responded or fuse/
MCB F2 has
blown/tripped
Check high limit
safety cut−out or
burner, burner loop
and fuse F2
(see page 61)
d6
Control mode Fault at "DE1" Check connections
at inputs "DE1" to
"DE3" i l i
d7
Fault at "DE2"
"DE3" in plug−in
adaptor for
external safety
d8
Fault at "DE3"
external
safety
equipment
(see page 135)
5862730GB