Troubleshooting - Cuenod C 285 Operating Instructions Manual

Troubleshooting

Check the following if failure
occurs :
• power supply (power and control),
• gas supply (valve pressure and
opening),
• control components,
• switch positions on TC control panel.
Symbols
Fault
Burner stopped in service position
nothing happens.
Gas pressure normal.
With leak testing device.
Burner shut down
in service position.
P
In "P" position.
Motor not running. Protection device open Insufficient air pressure.
Motor not running
Protection device closed.
Motor running.
in service position.
1
In "1" position.
No ignition spark.
Magnetic valves do not open.
Combustion head
Flame appears, but pulsates or goes out
(insufficient ionization current).
Burner continues with blower on but no
flame
I
In "I" position.
on
or
on
Others faults.
Fault shutdown at any time with no
program symbol.
Reprogramming of control and safety unit
without fault shutdown.
If problem persists :
• Check various program symbols
described here below on the control
and safety unit.
All the safety components must not be
repaired but only replaced by identical
components.
Use only the manufacturer's
original parts.
Causes
Insufficient gas pressure.
Gas pressure switch set wrongly or
defective.
Air pressure switch closed (contact
welded).
Leaker test shutdown.
Leaker test not energized.
Parasitic flame on thermostatic cut-out.
Thermal relay tripped.
Protective device defective.
Cable between protection device and
motor defective.
Motor defective.
Air pressure switch wrongly set or
defective.
Fault in flame monitoring system.
Ignition electrode(s) short-circuited.
Ignition cable(s) perished.
Ignition transformer defective.
Control and safety unit.
Break in electrical connections.
Coil(s) short-circuited.
Mechanical jamming of valves or
proportion regulator.
Combustion head wrongly set.
Air flap open too wide and/or gas flow too
great.
Servomotor defective.
Air flap jammed
Mechanical coupling defective.
Premature flame signal.
Ionization sensor rusted.
Gas pressure switch set wrongly or
defective.
05/2008 - Art. Nr. 13 013 503D
Note
After each operation :
• Check combustion and all circuits for
possible leaks.
• Perform safety check-up.
• Record results in the relevant
documents.
Corrective action
Set the distribution pressure.
Clean filter.
Set or replace gas pressure switch.
Replace air pressure switch.
Unscrew or change valve.
Check, change fuse.
Check gas valves for leaks.
Put to post-ventilation.
Replace air pressure switch.
Reset, adjust or replace the thermal relay.
Replace protection device.
Check cables.
Replace motor.
Adjust or replace air pressure switch.
Check pressure pipes.
Check the position of the ionization sensor
according to the earth.
Replace the control and safety unit.
Set or replace electrodes.
Replace ignition cables.
Replace ignition transformer.
Replace control unit.
Check cables between control unit,
servomotor, and the valve.
Replace coil(s).
Replace the valve.
Set combustion head.
Set air flap and/or gas flow.
Set or replace servomotor.
Free air flap.
Check or replace coupling.
Replace the control and safety unit.
Replace the sensor.
Set or replace gas pressure switch.
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