Nu-Way MGN 1350 M3D DLU, Installation & Maintenance Manual

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27 Troubleshooting
Defect determined: Cause: Remedy: Fault code
Burner motor does not start
up Electric supply lead faulty Rectify faults in electrical installation
Fuse faulty Replace
Safety thermostat locked Unlock 42 h
Temperature of controller setting is
exceeded Renewed start attempt after temperature
drop
MPA 22 faulty Replace 04 h
Leak Rectify leak 44H / 43H
No gas Safeguard gas supply
Gas pressure monitor faulty Replace gas train 22 h
Filter in gas train dirty Clean or replace
Air pressure switch not in idle position Check air pressure switch (see page 7) 20 h
Burner motor faulty Replace
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 swit-
ches to fault mode before or
after expiry of safety period Air pressure monitor does not switch
through during pre-ventilation See Page 7 21 h
Ignition influencing of ionization monitor See Page 8 26 h
Gas solenoid valve does not open Replace gas train
Starting gas quantity set too low Increase starting gas quantity
No ignition Check ignition electrode and setting, igni-
tion transformer and cable
Phase and zero mixed up Connect connector unit in correct phase
sequence
Flame control faulty Check according to Page 8 2BH
Air pressure switch opens during opera-
tion See Page 7 21 h
Gas nozzle dirty or faulty Replace gas nozzle
Flame extinguishes
during operation No gas Safeguard gas supply
Filter in gas train
dirty Clean or replace
Flame blow-off Incorrect burner setting 27 h
Air pressure monitor contact opens Check/replace air pressure switch 21 h
Flame signal too weak Measure flame signal, check ionisation
electrode 27 h