18
E
.0
4.
99
• G.
13.
11.
02
Service instructions/dimensions
Troubleshooting
Defect
determined:
Display
MMI 810
Blink code
DMG 970
Cause:
Remedy:
Burner motor does
not start up
as desired
-
Electric supply lead faulty
Rectify faults in electrical
installation
as desired
-
Fuse faulty
Replace
as desired
-
Safety thermostat
locked
Unlock
as desired
-
Temperature of controller set-
ting is exceeded
Renewed start attempt after tempera-
ture drop
as desired
-
Control box faulty
Replace
as desired
-
Leak
Rectify leak
as desired
-
No gas
Safeguard gas supply
as desired
-
Gas pressure monitor faulty
Replace compact unit
as desired
-
Filter in compact unit dirty
Clean or replace
rotates conti-
nuously
-
Air pressure monitor not in idle
position
Check air pressure switch (s. page 16)
blue-black/red
line
Burner motor faulty
Replace
blue-black/red
line
-
No load at terminal 5
Check plug connection and current path
of solenoid valve
-
Mains voltage
<
187 V
Rectify faults in electrical
installation
Burner starts up and
switches to fault
mode before or after
expiry of safety
period
blue
Ionisation message
Solenoid valve leaky, replace KE
blue-black/red
line
Air pressure monitor does not
switch through during pre-venti-
lation
See Page 16
yellow
Ignition influencing of ionization
monitor
See Page 16
yellow
Gas solenoid valve does not
open
Replace compact unit
yellow
Starting gas quantity set
too low
Increase starting gas quantity
yellow
No ignition
Check ignition electrode and
setting, ignition transformer
and cable (see Page 5)
yellow
Phase and zero mixed up
Connect connector unit
in correct phase sequence
yellow, red,
green
Ionisation monitor faulty
Check according to Page 16
yellow, red,
green
Air pressure switch opens
during operation
See Page 16
yellow, red,
green
Gas nozzle dirty or faulty
Replace gas nozzle
Flame extinguishes
during operation
yellow, red
-
No gas
Safeguard gas supply
green
-
Filter in compact unit soiled
Clean or replace
red or green
Flame blow-off
Incorrect burner setting
(see Page 10 ff.)
red or green
Air pressure monitor contact
opens
Check/replace air pressure monitor
(see Page 16)
red or green
Flame signal too weak
Measure flame signal, check ionisation
electrode(see Page 16)
Burner motor starts
up briefly. Control
box goes over to
fault again
-
random error
blink code
Control box has not been fault-
cleared
Unlock control box fault
-
Air pressure switch not in
idle position
Check air pressure switch (s. page 16)
Control box resets
automatically
-
Intermittent fault
(10 sec.)
Intermittent (1-5 sec.)
gas pressure fluctuations trig-
ger gas pressure monitor.
Safeguard gas supply. If necessary,
lower starting point of gas pressure
monitor.
