Viessmann Vitovalor 300-P Installation And Service Instructions For Contractors page 121

Fault codes for gas condensing module
Fault code dis- System characteristics
played
EF Burner in a fault state
F0 Burner blocked
F1 Burner in a fault state
F2 Burner in a fault state
F3 Burner in a fault state
F7 Burner blocked
F8 Burner in a fault state
F9 Burner in a fault state
FA Burner in a fault state
FC Burner in a fault state
Fd Burner in a fault state and ad-
ditional fault b7 is displayed.
Fd Burner in a fault state
(cont.)
Cause
Flame is lost immediately
after it has built (during
safety time).
Internal fault
Flue gas temperature lim-
iter has responded.
Temperature limiter has
responded.
Flame signal is already
present at burner start.
Short circuit or lead break,
water pressure sensor
Fuel valve closes too late. Check gas train. Check both con-
Fan speed too low during
burner start
Fan idle state not reached Check fan, fan connecting cables
Gas train faulty, faulty
modulation valve control
or flue gas path blocked
Coding card missing.
Burner control unit fault
Troubleshooting
Measures
Check gas supply (gas pressure
and gas flow switch).
Check balanced flue system for
flue gas recirculation.
Check ionisation electrode (replace
if necessary):
Distance to burner gauze assem-
■
bly (see page 78)
Electrode soiled
■
Press reset R.
Replace control unit.
Check heating system fill level.
Vent the system.
Press reset R after flue system has
cooled down.
Check heating system fill level.
Check circulation pump. Vent the
system. Check temperature limiter
and connecting cables.
Press reset R.
Check ionisation electrode and
connecting cable.
Press reset R.
Check the water pressure sensor
and lead.
trol paths.
Press reset R.
Check fan, fan connecting cables
and power supply to fan; check fan
control.
Press reset R.
and fan control.
Press reset R.
Check gas train. Check flue sys-
tem.
Press reset R.
Insert coding card.
Press reset R.
Replace control unit if fault per-
sists.
Check ignition electrodes and con-
necting cables. Check whether a
strong interference (EMC) field ex-
ists near the appliance.
Press reset R.
Replace control unit if fault per-
sists.
121