10
VAL6 KBE5S & KBE5L Trouble Shooting
No.
Possible Cause
How to check
Result
Remedy
56
Combustion air is
insufficient
Check whether a
combustion fan is run
(refer to #21, 22, 23)
If the combustion fan
does not run, imperfect
combustion occurs by
low oxygen
Replace a
combustion fan
and/or circuit board
Check whether vanes of
combustion fan are dusty
If vanes are dusty,
imperfect combustion is
occurs by low oxygen
Clean a vanes of
combustion fan
Check whether air inlet
opening for combustion
is appropriate
If opening is small,
imperfect combustion
occurs by low oxygen
Adjust a air inlet
opening
Normal scale
：
3
Check whether applied
voltage is normal
Standard: 120V±10%
If applied voltage is
lower than 108V,
imperfect combustion by
decreasing of combustion
fan rotation speed occurs
Find a cause(s) of
low voltage and
solve it
* or plug into
another outlet
57
Oxygen for
combustion is low
because of high
altitude
Check whether the heater
is opearting in an altitude
higher than 1000m
If its altitude is higher
than 1000m, imperfect
combustion occurs by
low oxygen environment
Expand an air inlet
opening gradually
until smoke is clear
away
Normal scale: 3
Heater produces BLACK smoke
Heater is using in high altitude
Adjustment of air inlet
expand an air inlet opening for combustion
fan gradually (scale should be 4 or more)
until smoke is clear away or flame doesn't
protrude from the radiation disk.
10
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