Transformer Is Defective - Val6 KBE5L Maintenance Manual

VAL6 KBE5S & KBE5L Trouble Shooting
No. Possible Cause
Electrode is not sparking
24 Ignition transformer
connector (CN4) or
high-voltage cord is
loose connection
25 Electrode is defective
（abnormal electrode） Confirm that an electrode
(clearance is out of
alignment)
26 Ignition transformer is
defective
27 Circuit board (Burner
control) is defective
The heater does not ignite
Fuel pump doesn't turn on (no vibration of fuel pump)
28 Fuel pump connector
(CN6) is loose
connection
29 Fuel pump is defective
30 Circuit board (Burner
control) is defective
Fuel pump is idling with clicking sound
31 Fuel pump is inhaling
air which is remaining
in fuel line
(especially brand-new
heater or after
refueling)
32 Pump is inhaling air
from the fittings of
fuel line between tank
and fuel pump
How to check
or a high-voltage cord
are not wet or dirty by
grime
Refer to drawing①
Measure voltage at
ignition transformer
connector (CN4) on
Standard: AC120V
(black-black)
Plug fuel pump
connector (CN6) again,
and then turn on
Measure voltage at
output side of fuel pump
connector on circuit
board:
Standard: AC60～96V
(red-blue)
Confirm no loose fitting
in fuel line
Result
If it reads 120V,
ignition transformer is
defective
If it doesn't read 120V,
circuit board is defective
If it works normally, fuel
pump connector fails on
contact
If the value shows
standard voltage, the
pump is defective
If the value does NOT
show standard voltage,
the circuit board is
defective
If any loose fittings,
tighten it
5
Remedy
Connect connection
of ignition
transformer
connector (CN4) or
high-voltage cord
Replace an electrode
Clean an electrode
or a high-voltage
cord
Replace an ignition
transformer
Replace a circuit
board
Plug connector
(CN6) firmly
Replace a fuel pump
Replace a circuit
board
Repeat start-
operation 2 or 3
times in order to
pump air out of fuel
line
＊NEVER repeat
more than 4 times in
a row as fire may
result
Tighten all fittings
and repeat start-
operation
5