Maintenance
Installation, use and maintenance manual – M gas unit heater
33
7
(procedure Paragraph 7.3
p.32
).
Check the extractor fan for voltage. If the voltage is
present but the extractor fan does not start, replace
the condenser of the extractor fan. If this does not
solve the problem, replace the extractor fan itself.
9. After 40 seconds from extractor fan start, check the
electrodes for sparks. If the electrodes do not spark:
Check its position and the connection cable.
Check the ignition box fuse. If it is broken, replace
it.
If the fuse is intact but the electrodes do not spark,
replace the ignition transformer.
10. If the burner starts but stops immediately after
sparking:
Check that the phase and the neutral of the power
supply are not reversed.
Check the position and integrity of the detection
electrode and, if necessary, replace it.
If the electrode and power supply are ok, replace
the ignition transformer.
11. If the burner does not start or no gas ows from it:
Check gas supply.
If gas is present, check for voltage at the gas valve
during scintillation. If voltage is present and the
extractor fan is running, check that the nozzle is
not obstructed. If the nozzle is free, replace the gas
valve.
If the gas is still being supplied, but no voltage is
supplied to the gas valve, check the electrical con-
nections to the control board and, if correct, re-
place the control board.
12. After the burner ignition, check gas supply pressure,
both static and dynamic, with respect to values in
Table 3.1
p.18
.
13. Check that the fan starts (within 120 seconds from the
ignition of the burner):
If it does not start, check the correct operation of
the heat exchanger probe and, if necessary, replace
it.
Check the fan motor condenser and, if necessary,
replace it.
If this does still not solve the problem, replace the
fan motor.
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