page no. 48 of 68
CP
x Range Users, Installation & Servicing Instructions Doc Ref M201 issue 2.9 Nov 2018.
FAULTS
POSSIBLE CAUSES
SOLUTION
The burner doesn’t
start when the limit
thermostat closes.
Lack of electrical supply.
Check presence of voltage in the L1-N clamps of the 7 pin
plug.
Check the condition of the fuses.
Check that safety thermostat is not lock out.
Lack of gas
Check the manual cock opening
Check that the valves charge over to the opening position
and there are not short circuits.
The gas pressure switch does not close its
contact.
Adjust them.
The connections in the control box are wrongly
inserted.
Check and connect all the plugs
The air pressure switch is changed over to the
operational position.
Replace the pressure switch
Burner tends to pull
the flame when
switching from 1st
to 2nd stage.
Output ratio between 1st and 2nd stage
greater than 1:2.
Restore correct maximum ratio of 1:2, making sure 1st stage
output is no less than the operating range’s minimum.
High air excess in 1st stage
Restore the correct air excess value (λ min. = 1.3) see manual
The burner runs
normally in the
prepurge and
ignition cycle and
locks out after
about 3 seconds.
Phase and neutral connection is inverted.
Invert them.
The earth connection lacks or is inefficient.
Make the earth connection efficient.
The ionization probe is earthed or not in
contact with the flame, or its wiring to the
control box is broken, or there is a fault on its
insulation to the earth.
Check the right position and if necessary set it according to
the instructions.
Reset the electrical connection.
Replace the faulty connection.
The burner starts
with an ignition
delay.
The ignition electrodes is wrongly positioned.
Adjust it according to the instructions.
Air output is too high.
Set the air output according to the instructions.
Valve brake is too close with insufficient gas
output.
Adjust it.
The burner doesn’t
change over the
2nd stage.
The air damper is locked.
Check the right working.
Check the right electrical connection
The 2nd stage gas valve doesn’t pull in.
Failed valve: replace it.
The air damper doesn’t close completely and therefore it
doesn’t pull in the 2nd stage valve micro: check the micro
working.
The burner locks
out after the
prepurge phase
due to flame failure.
The solenoid valves is passing too little gas.
Check the pressure in the network and/or adjust the solenoid
valve according to the instructions of this manual.
The solenoid valves are defective.
Change them
The ignition arc is irregular or has failed.
Check the right insertion of the connectors.
Check the right position of the electrode according to the
instructions of this manual.
The pipe has not been purged from the air.
Carry out a complete breathing of the line of gas-supply.
The burner locks
out during the
prepurge phase.
The air pressure switch does not change over
to the operational position.
The pressure switch is faulty, change it.
The air pressure is too low, (the head is bad adjusted).
The flame exists.
Faulty valves: replace them.
The pressure test point is badly positioned.
Place it in the right position according to the instructions.
The burner
continues to repeat
the starting cycle
without going on
lock-out.
The gas pressure in the gas main lies very close
to the value to which the gas pressure switch
has been set. The sudden falling off pressure at
the opening of the valve causes the opening
of the pressure switch. However this only
temporarily, because the valve immediately
closes again, so then does the pressure switch,
because the pressure builds up again, causing
the cycle to be repeated over and over.
Lower and set the pressure switch.
