5
VAL6 KBE5S & KBE5L Trouble Shooting
No.
Possible Cause
How to check
Result
Remedy
24
Ignition transformer
connector (CN4) or
high-voltage cord is
loose connection
Connect connection
of ignition
transformer
connector (CN4) or
high-voltage cord
25
Electrode is defective
Replace an electrode
（
abnormal electrode
）
Confirm that an electrode
or a high-voltage cord
are not wet or dirty by
grime
Clean an electrode
or a high-voltage
cord
(clearance is out of
alignment)
Refer to drawing
①
26
Ignition transformer is
defective
Measure voltage at
ignition transformer
connector (CN4) on
If it reads 120V,
ignition transformer is
defective
Replace an ignition
transformer
27
Circuit board (Burner
control) is defective
Standard: AC120V
(black-black)
If it doesn't read 120V,
circuit board is defective
Replace a circuit
board
28
Fuel pump connector
(CN6) is loose
connection
Plug fuel pump
connector (CN6) again,
and then turn on
If it works normally, fuel
pump connector fails on
contact
Plug connector
(CN6) firmly
29
Fuel pump is defective
If the value shows
standard voltage, the
pump is defective
Replace a fuel pump
30
Circuit board (Burner
control) is defective
If the value does NOT
show standard voltage,
the circuit board is
defective
Replace a circuit
board
31
Fuel pump is inhaling
air which is remaining
in fuel line
(especially brand-new
heater or after
refueling)
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
32
Pump is inhaling air
from the fittings of
fuel line between tank
and fuel pump
Confirm no loose fitting
in fuel line
If any loose fittings,
tighten it
Tighten all fittings
and repeat start-
operation
Fuel pump doesn't turn on (no vibration of fuel pump)
Measure voltage at
output side of fuel pump
connector on circuit
board:
Standard: AC60
～
96V
(red-blue)
Fuel pump is idling with clicking sound
Electrode is not sparking
The heater does not ignite
5
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