Toyotomi Laser 60AT Manual page 39

L A S E R H E A T I N G
Section 6
6-5 TROUBLE SHOOTING GUIDE
FAILURE CHECK1 RESULT
3
Stops Does ignite? Yes.
operation
and
indicates
error code
"EE2"
No.
S Y S T E M S
Trouble Shooting
CHECK2 RESULT CHECK3 RESULT
Is circula-
Burning
Yes.
tion fan
mode lamp
"MED" cha- operated?
nged from
flashing to
Yes.
continuous?
No. Does flame
rod sensor
work
properly?
Yes.
Is igniter Yes. Does fuel Yes.
red? pump work?
Ia there
No. Yes.
120V at "G"
pins on
circuit
board?
CHECK4 RESULT CHECK5
No.
Is overheat
Yes.
protector
activated?
No.
No.
Check for No.
water in
fuel
Yes.
Is there
No. Yes.
DC107V at
"A" pins
(between No.
black and
orange) on
circuit
board?
No.
RESULT CAUSE
Overheat condition
Overheat condition
Main circuit board malfunction
Flame rod sensor touches 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
Fuel not entering into fuel pump
Fusible link valve closed
Malfunction fuel constant level valve
Fuel nozzle is clogged
Fuel not fed because of surface
tension of water
Water gathering in fuel tank
Fuel pump malfunction
Wiring failure
Main circuit board malfunction
lgniter malfunction**
**Igniter malfunction may cause by water
in the fuel. Check for the water in fuel.
Main circuit board malfunction
SOLUTION
1. Turn off heater
2. Check or replace circulation fan
3. Restart heater
1. Unplug heater
2. Remove air flow ostructions and/or deter-
mine causes of overheat and replace parts
3. Restart heater
Check or replace main circuit board
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
Check and clean fuel nozzle
Push fuel constant level valve reset
button
Open valve or replace handle of
fusible link valve
Check or replace fuel constant level
valve (fuel sump)
Clean fuel nozle
Discharge water
Check or replace fuel pump
Correct or replace wires
Check or replace main circuit board
Check or replace igniter
Check or replace main circuit board
36
S E R V I C E M A N U A L