Installation Instructions

44
Display Action
Control unit issues
a heat demand
No
Increase set value
and ensure heat is
drawn off
Yes
Fan starts
No
After approx. 1 min
fault F9
Check the fan, fan
connecting cables,
power at the fan
and fan control
Yes
Ignition
No
Fault F4 Check the ignition
module connec-
tion
Yes
Gas train opens
No
Fault F4 Check the gas
train (control volt-
age 230 V); check
the gas supply
pressure
Yes
Ionisation current
builds (greater
than 2 µA)
Symbol
A
No
Fault F4 Check the ionisa-
tion current, check
the electrode
adjustment, con-
densate drain and
the gas line for air-
locks.
Troubleshooting
Function sequence and possible faults
5609 059 GB