Operating instructions

118
Troubleshooting
Faults which are displayed at the programming unit (cont.)
Fault
code
System
characteristics
Cause Remedy
c4
Control mode Communication
with function
extension 0−10V
faulty
Check connections
and cables/leads; if
required replace
function extension
(see page133).
Without function
extension,
set code "9d:0"
c8
Boiler cools down Error
Low water indicator
Check water level in
system,
reset low water
indicator
(see page 136)
c9
Fault
Maximum pressure
limiter
Check system
pressure, reset
maximum
pressure limiter
(see page 136)
ca
Fault
Minimum pressure
limiter or
maximum pressure
limiter 2
Check system
pressure; reset
minimum or
maximum pressure
limiter (see page 136)
cb
Fault
Additional high
limit safety cut−out,
temperature limiter
or flue gas damper
Check system
temperature; reset
high limit safety
cut−out or flue gas
damper
(see page 136)
5862730GB