Troubleshooting - Cuenod NC9 GX207/8 Notice D'emploi

Troubleshooting

In case of failure one must check:
· that the voltage is ON,
· the gas supply (valve pressure and
opening),
· the control elements,
· the switch position on the control
board.
If the failure persists:
· Read the luminous signals delivered
by the control and safety unit and
their meaning on the table below.
Defect
The burner does not function.
Nothing happens.
Normal gas pressure.
Thermostatic chain.
The burner does not start after closing of the
thermostatic circuit.
The control and safety unit does not indicate
any defect.
The burner starts when the voltage is applied
and functions during a short period of time,
then it stops and delivers this signal:
x x V y y y - y y y y y
Unit energised
y y V x x x
Unit energised
x x x V y y
x x x x V y
Unit energised
x x V y y y
Unit energised
x V y y y y
Unit energised
y y y y V x
50
Special appliances are available which
can be adapted on SG 513 units to
make it possible to understand any
other pieces of information provided by
the control and safety unit.
All the safety components must not be
repaired but only replaced by identical
components.
m
Use only the manufacturer's
original parts.
Causes
Too low gas pressure.
Gas pressure switch misadjusted or defective.
Foreign matter present in the pressure tap
channel.
Thermostats defective or misadjusted.
Supply voltage drop or absence.
Unit defective.
The control and safety unit has been switched
off purposely.
Air pressure switch: the contact is stuck.
Air pressure switch: the contact does not
close.
Air pressure switch: the contact opens on
start-up or in service.
Stray light during prefiring.
No flame at the end of the safety time delay:
Unsuitable gas flow rate.
Flame monitoring circuit defective.
No firing arc:
Firing electrode(s) short-circuited.
Firing wire(s) damaged or defective.
Firing transformer defective.
Control and safety unit.
Electromagnetic valves do not open.
Valves mechanically jammed.
Flame extinguishing when in service.
06/2004 - Art.Nr. 13 011 288C
Remarks:
After work has been carried out one
must:
· Check the combustion under
operating conditions (doors closed,
cover in position, etc.) and the
circuit tightness.
· Record results on the relevant
documents.
Remedies
Adjust the feed pressure.
Clean the filter.
Check the gas pressure switch or replace it.
Clean the pressure tap tubes (without
pressurised fluid).
Adjust the thermostats or replace them.
Check the origin of voltage drop or absence.
Replace the unit.
Reset the unit.
Replace the pressure switch.
Check the pressure tap (foreign matter) and
the wiring.
Adjust the pressure switch or replace it.
Check tightness of the valve and/or replace it.
Adjust the gas flow rate.
Check the condition and position of the
ionisation probe relative to ground.
Check the condition and connections of the
ionisation circuit (cable and measuring bridge).
Adjust, clean or replace the electrode(s).
Connect or replace the firing wires.
Connect the cables or replace them.
Replace the transformer.
Replace the control unit.
Check the wiring between the unit, the
servomotor and the ground.
Check the coil or replace it.
Replace the valve.
Check the ionisation probe circuit.
Check the control and safety unit or replace it.