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L A S E R
H E A T I N G
Section 6
6-5 TROUBLE SHOOTING GUIDE
FAILURE
CHECK1
RESULT
7
Normal
Yellow high
Is a unit
placed hori-
flame
zontally?
whistling
moise or
Is flue pipe
smoke
too long or
produced
have too
when set
many
"HIGH"
bends?
Abnormal
8
The
Yes.
Ia window
overheat
curtain
protector
too close
is activated
to the
rear of unit?
No.
Is circula-
tion fan
cover
dusty?
9
Room temp.
Room temp.
Yes.
indicates
is below
"LO"
14˚F
(-10˚C)
No.
S Y S T E M S
Trouble Shooting
CHECK2
RESULT
CHECK3
RESULT
Normal
Check out
Does blower
Normal
side end of
motor work
flue pipe for
properly?
flow of air
and exhaust
Check for
obstructions
(such as
Abnormal
wasps nests
in exhaust
Abnormal
or air supply
piping)
Does circu-
Yes.
lation fan
operate
No.
properly?
CHECK4
RESULT
CHECK5
RESULT
Burner ring
Yes.
sit properly
in the
burner
No.
CAUSE
SOLUTION
Fuel pump malfunction
Replace fuel pump
Checkand correct or replace the
bunner ring
Intake or exhaust line clogged
Clean out air and exhaust ducts
Blower motor failed
Replace blower motor assembly
Clogged air supply or exhaust piping
Remove obstructions
Not as specified
Correct as specified
Clean fan cover
Curtain or other obstruction covers
circulation air inlet
Keep curtain away from unit
Obstacle covers circulating air outlet
Remove obstacle
Main circuit board malfunction
Check or replace main circuit board
Circulation fan motor malfunction
Check and replace fan motor
Incorrect wiring
Check and correct wiring
Room temp. is too low
Wiring failure
Correct wiring
Main circuit board malfunction
Check or replace main circuit board
Room temperature sensor
Check or replace room temperature
malfunction
sensor
38
S E R V I C E M A N U A L
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Table of Contents
Troubleshooting
