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Further details regarding the individual steps
Function sequence and possible faults
Control unit is-
sues heat de-
mand
Yes
Fan starts
Yes
Differential pres-
sure sensor en-
ables start
(0.75 V across
terminals "X8.5"
and "X8.6")
Yes
Ignition
Yes
Gas train opens
Commissioning, inspection, maintenance
Display screen
No
After approx. 51 s
No
fault F5/F9
After approx. 51 s
No
fault E6/F5
Fault F4
No
Fault F4
No
(cont.)
Measures
Increase set
value and ensure
heat is drawn off
Check fan cables
and plug-in con-
nectors
Check fan cables
and plug-in con-
nectors, check
fan
Check ignition
module (control
voltage 230 V
across plugs
"X2.1" and
"X2.2")
Check the gas
train (control vol-
tage 230 V);
check the gas
supply pressure
13
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