Function Sequence And Possible Faults - Viessmann VITOPEND 200 Installation And Service Instructions Manual

Further details regarding the individual steps

Function sequence and possible faults

For further information, see page 78
Control unit is-
sues heat de-
mand
Yes
Fan starts
Yes
Air pressure
switch enables
start (contact
closed across
terminals "X8.10"
and "X8.11")
Yes
Ignition
Yes
Gas combination
valve opens
Initial start-up, inspection, maintenance
Display screen
No
after approx. 200
No
seconds fault F9
after approx. 200
No
seconds fault E6
Fault F4
No
Fault F4
No
(cont.)
Measures
Increase set
value and ensure
heat is drawn off
Check cables and
plug‐in connec-
tions
Check fan cables
and plugs, check
fan
Check the ignition
module (control
voltage 230 V
across plugs
"X2.1" and
"X2.2")
Check the gas
combination valve
(control voltage
230 V); check the
gas supply pres-
sure
23