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Service instructions/dimensions
Troubleshooting
Defect determined:
Burner motor does not start up
Burner starts up and switches to fault mode before or after expiry of safety period
Flame extinguishes during operation
Flash code
DMG 970 / 972
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Burner motor starts up briefly. Control unit goes back to fault
Random error flash code
Control box resets automatically
Intermittent fault
(10 sec.)
Cause: Remedy:
Electric supply lead faulty
Fuse faulty
Safety thermostat locked
Temperature of controller setting is exceeded
Control box faulty
Leak
No gas
Gas pressure monitor faulty
Filter in compact unit dirty
Burner motor faulty
No load at terminal 5
Mains voltage < 187 V
Rectify faults in electrical installation
Replace
Unlock
Renewed start attempt after temperature drop
Replace
Rectify leak
Safeguard gas supply
Replace compact unit
Clean or replace
Replace
Check plug connection and current path of solenoid valve
Rectify faults in electrical installation
Solenoid valve leaking
See Page 24
Ionisation message
Air pressure monitor does not switch through during pre-ventilation
Ignition influencing of ionisation monitor
See Page 24
Gas solenoid valve does not open
Replace compact unit
Starting gas quantity set too low Increase starting gas quantity
No ignition Check ignition electrode and setting, ignition transformer and cable (see Page 23)
Phase and zero mixed up
Ionisation monitor faulty
Connect connector unit in correct phase sequence
Check according to Page 23/24
Air pressure switch switches during operation
See Page 24
Gas nozzle dirty or faulty
No gas
Filter in compact unit dirty
Flame blow-off
Air pressure monitor contact opens
Flame signal too weak
Control unit has not been cleared of fault
Air pressure switch not in idle position
Intermittent (1-5 sec.) gas pressure fluctuations trigger gas pressure monitor.
Replace gas nozzle
Safeguard gas supply
Clean or replace
Incorrect burner setting
(see Page 17 onwards)
Check/replace air pressure monitor
(see Page 24)
Measure flame signal, check ionisation electrode (see Page 23/24)
Clear control units of fault
Check air pressure switch
Safeguard gas supply. If necessary, lower starting point of gas pressure monitor.
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