121
Fault code dis-
played
System characteristics
Cause
Measures
EF
Burner in a fault state
Flame is lost immediately
after it has built (during
safety time).
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
.
F0
Burner blocked
Internal fault
Replace control unit.
F1
Burner in a fault state
Flue gas temperature lim-
iter has responded.
Check heating system fill level.
Vent the system.
Press reset
R
after flue system has
cooled down.
F2
Burner in a fault state
Temperature limiter has
responded.
Check heating system fill level.
Check circulation pump. Vent the
system. Check temperature limiter
and connecting cables.
Press reset
R
.
F3
Burner in a fault state
Flame signal is already
present at burner start.
Check ionisation electrode and
connecting cable.
Press reset
R
.
F7
Burner blocked
Short circuit or lead break,
water pressure sensor
Check the water pressure sensor
and lead.
F8
Burner in a fault state
Fuel valve closes too late. Check gas train. Check both con-
trol paths.
Press reset
R
.
F9
Burner in a fault state
Fan speed too low during
burner start
Check fan, fan connecting cables
and power supply to fan; check fan
control.
Press reset
R
.
FA
Burner in a fault state
Fan idle state not reached Check fan, fan connecting cables
and fan control.
Press reset
R
.
FC
Burner in a fault state
Gas train faulty, faulty
modulation valve control
or flue gas path blocked
Check gas train. Check flue sys-
tem.
Press reset
R
.
Fd
Burner in a fault state and ad-
ditional fault b7 is displayed.
Coding card missing.
Insert coding card.
Press reset
R
.
Replace control unit if fault per-
sists.
Fd
Burner in a fault state
Burner control unit fault
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.
Troubleshooting
Fault codes for gas condensing module
(cont.)
5775 636 GB
Diagnosis
Содержание C3TB
Страница 44: ...44 3 5 1 2x 2 4 7 6 Fig 43 Installation sequence Fitting the front panels 5775 636 GB Installation ...
Страница 48: ...48 14 Fig 47 Installation sequence If required for easier handling Dismantling cont 5775 636 GB Installation ...
Страница 136: ...136 Troubleshooting Repairs gas condensing module cont 5775 636 GB Diagnosis ...
Страница 143: ...143 Parts lists Heat cell assembly 5775 636 GB Components ...
Страница 148: ...148 0001 0001 0003 0003 0002 0002 0004 Fig 118 Parts lists External connection assembly 5775 636 GB Components ...
Страница 154: ...154 0006 0003 0005 0001 0002 0004 Fig 121 Parts lists Miscellaneous assembly 5775 636 GB Components ...
Страница 160: ...160 Parts not shown 0009 PCB IU100 B30 Parts lists Fuel cell assembly 5775 636 GB Components ...
Страница 161: ...161 Parts lists Fuel cell assembly cont 5775 636 GB Components ...
Страница 187: ...187 5775 636 GB ...