Toyotomi Toyoset NS-2800, Service Manual, Page: 20 / 47

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(2) Visual Inspection
A. Push in the HEAT switch to
“
ON
”
.
B. Look downward through the peep window on the heat chamber. Verify that igniter
is glowing. If the igniter does not glow, something is wrong. Refer to
Troubleshooting in Section 6 of this service manual to solve the problem.
(3) Reassembly of Heater; Push in the HEAT switch to
“
OFF
”
and replace the cabinet B.
4-5. Fuel Contamination
Fuel contamination is often difficult to diagnose, even though it will adversely affect the
heater operation and performance. The best course of action to take when fuel
contamination is suspected is to examine all of the fuel line, beginning with the fuel
strainer. If the strainer is clogged, replace it with a new one.
WARNING: Before proceeding further, unplug the heater.
When it has been determined that water or some other contaminants have infiltrated the
fuel, the following procedure should be used.
STEP 1: Remove contamination
Drain the contaminants from tank or disconnect the fuel supply tube and clean
the contamination from the fuel tank. Refill with fresh and clean fuel.
STEP 2: Clean the heater
a. Replace the fuel strainer.
b. Using clean paper towels, thoroughly wipe the bottom of the burner, the
burner ring, the flame sensor (flame rod), and the heat chamber. Replace
the burner mat, if necessary.
STEP 3: Reinstall the cleaned components
a. Replace the components correctly and install new gaskets, if necessary.
b. Supply power to the heater.
Test-run the heater to see if the problem clears up, using new clean fuel.