Cuenod C 24 GX 507 T1 [16/48] Troubleshooting

Cuenod C 24 GX 507 T1 [16/48] Troubleshooting
02/2008 - Art. Nr. 13 019 866A16
Troubleshooting
• Check the following if failure occurs:
- power supply (power and control),
- fuel supply (pressure and valve
opening),
- control components.
If the problem persists:
• Remove cover A4.
• Check the light signals of the control
and safety unit and their symbols
described in table below.
To find out what other information
shown by the unit means, specific
equipment is available. This is adapted
to the SG 513 control unit.
Safety components must not be
repaired but replaced by similar items.
Only use manufacturer spare
parts.
Note:
After each operation:
• Check combustion and all circuits for
possible leaks.
• Perform safety checks.
• Record results in the relevant
documents.
Symbol Fault Cause Corrective action
Burner stops
Nothing happens
Normal gas pressure
Thermostatic chain
Insufficient gas pressure
Misadjusted or faulty gas pressure switch
Foreign body in the pressure tap pipe.
Misadjusted or faulty thermostats
Adjust the distribution pressure.
Clean the filter.
Check or replace the gas pressure switch.
Clean the pressure tap pipes (without
pressurised fluid).
Adjust or replace the thermostats.
Burner does not start after thermostatic closure.
Control unit does not signal any fault
Low or no power supply.
Faulty control unit
Check source of low or missing voltage.
Change control unit.
Burner starts, when powered up, for a short
time then stops and shows this signal.
❘ ❘  ❙ ❙ ❙
❘ ❘  ❙ ❙ ❙❘ ❘  ❙ ❙ ❙
❘ ❘  ❙ ❙ ❙❙ ❙ ❙ ❙
❙ ❙ ❙ ❙ ❙❙ ❙ ❙ ❙ ❙
❙ ❙ ❙ ❙ ❙
Control unit voluntarily stopped Reset control unit.
Control unit on
❙ ❙  ❘ ❘ ❘
❙ ❙  ❘ ❘ ❘ ❙ ❙  ❘ ❘ ❘
❙ ❙  ❘ ❘ ❘
Air pressure switch: contact is welded. Change or adjust pressure switch.
Control unit on
❘ ❘ ❘  ❙
❘ ❘ ❘  ❙ ❙ ❘ ❘  ❙
❘ ❘ ❘  ❙ ❙
❘ ❘ ❘ ❘ 
❘ ❘ ❘ ❘ ❘ ❘ ❘ ❘ 
❘ ❘ ❘ ❘ 
Air pressure switch: contact does not close.
Air pressure switch: contact opens during
start-up or operation.
Check pressure tap (foreign body) and wiring.
Adjust or change pressure switch.
Control unit on
❘ ❘  ❙ ❙ ❙
❘ ❘  ❙ ❙ ❙❘ ❘  ❙ ❙ ❙
❘ ❘  ❙ ❙ ❙
Stray light during pre-ignition. Check valve tightness and/or change it.
Control unit on
❘  ❙ ❙ ❙
❘  ❙ ❙ ❙❘  ❙ ❙ ❙
❘  ❙ ❙ ❙
No flame signal at end of safety time
Unsuitable gas flow rate
Faulty flame monitoring circuit
No ignition arc
Ignition electrode(s) short-circuiting
Damaged or faulty ignition cable(s)
Faulty ignition transformer
Control unit
Electromagnetic valves do not open
Mechanical jamming in valves
Adjust gas flow rate.
Check state and position of ionization probe in
relation to mass.
Check state and connections of ionization
circuit (cable and measuring bridge).
Adjust, clean or replace electrodes.
Connect or replace cable(s).
Replace ignition transformer.
Change control unit.
Check wiring between control unit, servomotor
and valves.
Check, change coil.
Change valve.
Control unit on
❙ ❙ ❙ ❙  ❘
❙ ❙ ❙ ❙  ❘❙ ❙ ❙ ❙ 
❙ ❙ ❙ ❙  ❘
Flame disappears during operation. Check ionization probe circuit.
Check or change control unit.

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