Toyotomi Laser 300 Service Manual page 39

L A S E R H E A T I N G
Section 4
FAILURE CHECK1 RESULT
8
Is a unit
Yellow high Normal
flame placed hori-
whistling
zontally?
noise or
smoke
produced
when set
"HIGH"
Abnormal
9
Room temp Room temp.
Yes.
indicates is below 14˚F
"LO" (-10˚C)
No.
10
Stops
operation and
indicates error
code "E-23"
Stops Check if the
Yes.
operation and power source
indicates error
is 120V-60Hz.
code "E-0"
No.
S Y S T E M S
Trouble Shooting
CHECK2 RESULT CHECK3 RESULT
Does blower
Normal Check out Normal
motor work
side end of
properly?
flue pipe for
flow of air
Check for and exhaust
obstructions
(such as
Abnormal
wasps nests
in exhaust
Abnormal
or air supply
piping)
CHECK4 RESULT CHECK5 RESULT
Burner ring Yes.
sit properly
in the
burner?
No.
CAUSE SOLUTION
Fuel pump malfunction Replace fuel pump
Check and correct or replace the
burner ring
Intake or exhaust line clogged Clean out air and exhaust ducts
Blower motor failed Replace blower motor
Clogged air supply or exhaust piping Remove obstructions
Not as specified Correct as specified
Room temp. is too low.
Wiring failure Correct wiring
Main circuit board malfunction Check or replace main circuit board
Check or replace room temperature
Room temperature sensor malfunction.
sensor.
Heater operates normally after flame
There is flame before ignition.
disappears.
Flame sensor malfunction Check or replace flame sensor
Main circuit board malfunction Check or replace main circuit board
Main circuit board malfunction Check or replace main circuit board
Power source failure Check the power souce
37
S E R V I C E M A N U A L