03/2008 - Art. Nr. 13 013 477C
19
Troubleshooting
• Check the following if failure occurs:
- power supply (power and control),
- fuel supply (valve pressure and
opening),
- control components,
- switch positions on
TC
control panel.
If problem persists:
• Check light signals of control and
safety unit and their symbols
described in table herebelow.
To find out what other information shown
by the unit mean, specific equipment is
available and is suited to the SG 513
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 check-up.
• 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 pressure take-off pipe
Misadjusted or faulty thermostats
Adjust distribution pressure
Clean filter
Check or replace gas pressure switch
Clean pressure take-off pipes
(without pressurized fluid)
Adjust or replace thermostats
Soot on the ionisation probe
Too much gas on the probe
Scan insufficient
Fit the undrilled screws (propane kit)
Burner does not start after thermostatic
closure.
Unit does not signal any fault.
Low or no power supply
Faulty unit
Check source of low or missing voltage
Change unit
Burner starts, when powered up, for a short
time then stops and shows this signal
-
Unit has been purposely shutdown
Reset unit
Unit on
Air pressure switch: contact is welded
Change or adjust pressure switch
Unit on
Air pressure switch: contact does not close
Air pressure switch: contact opens during
start -up or operation
Check pressure take-off (foreign body) and
wiring
Adjust, change pressure switch
Unit on
Spurious light during the surveillance phase
In the event of a cell burner, faulty cell
Change valve
Change cell.
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
Replace transformer
Change control unit
Check wiring between unit, servomotor and
valves
Check, change coil
Change valve
Unit on
Flame disappears while in operation
Check ionization probe circuit
Check or change control unit
Summary of Contents for C120 GX507/8
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