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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
4
Stops
Is circula-
Yes.
operation
tion fan
and
operated?
indicates
error code
"EE6"
No.
5
Burning
Stops
No.
mode lamp
operation
changes
and
Yes.
indicates
from continu-
error code
ous to flash-
"EE10"
ing when
entered
extinguish-
ing mode
6
All burning
mode
lamps
flashing
S Y S T E M S
Trouble Shooting
CHECK2
RESULT
CHECK3
RESULT
Is overheat
Yes.
protector
activated?
No.
Does flame
rod sensor
work
properly?
Yes.
Does fuel
Yes.
pump work?
No.
CHECK4
RESULT
CHECK5
No.
RESULT
CAUSE
Overheat condition
Flame rod sensor touches to burner
parts
Carbon built up on the flame rod
sensor
Disconnected or incorrect wiring
Fuel flow too little
Air lock in fuel line
Clogged fuel nozzle
Overheat condition
Main circuit board malfunction
Wiring failure
Solenoid pump malfunction
Fuel drain in burner
There is flame before ignition and the
electricity was cut off over 10 seconds.
Main circuit board malfunction
SOLUTION
1. Unplug heater
2. Remove air flow obstructions
and/or determine caises of
overheat and replace parts
3. Restart heater
Correct or change flame rod sensor
Check and clean flame rod sensor
Check and correct wiring
Check or replace fuel pump
Straighten fuel line to remove air
pocket or correct fuel line installation
Clean and clean fuel nozzle
1. Turn off heater
2. Check or replace circulation fan
3. Restart heater
Check or replace main circuit board
Correct or replace wires
Check or replace fuel pump
Check and clean fuel pipe
Check blower motor
Check fuel pump
Heater operates normally after
flame disappeared.
Check or replace main circuit board
37
S E R V I C E M A N U A L
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Table of Contents
Troubleshooting
