Napoleon HD35NT, HD40NT Installation And Operating Instructions Manual page 52

52
SYMPTOM
Continues to
spark and pilot
lights, but main
burner will not
light.
Pilot light stops
sparking / pilot
remains lit but
burner will not
turn on.
Exhaust
fumes smelled
in room,
headaches.
Flames
are very
aggressive.
Main burner
fl ame is a
blue, lazy,
transparent
fl ame.
White / grey
fi lm forms.
W415-0820 / D / 02.03.12
PROBLEM
Short or loose
connection in sensor
rod.
THTP
Poor fl ame
rectifi cation or
contaminated sensor
rod.
Wiring / connection.
Wiring harness.
Module or valve.
Appliance is spilling.
Door is ajar.
Venting action is too
great.
Blockage in vent.
Sulphur from fuel
is being deposited
on glass, logs or
combustion chamber
surfaces.
TEST SOLUTION
- Verify all connections. Verify the connections from the pilot
assembly are tight; also verify these connections are not
grounding out to any metal.
- Verify the TH wires are connected to the valve.
- Verify the THTP wires are connected to the valve.
- Verify the fl ame is engulfi ng the sensor rod. This will
increase the fl ame rectifi cation. Verify correct pilot
orifi ce is installed and inlet gas specifi cations to manual.
(Remember, the fl ame carries the rectifi cation current, not
the gas. If the fl ame lifts from the pilot hood, the circuit is
broken. A wrong orifi ce or too high of an inlet pressure
can cause the pilot fl ame to lift). The sensor rod may need
cleaning.
- Inspect all wires, ensure good tight connections. Verify that
all wiring is installed exactly as specifi ed.
- Inspect the wiring harness and verify the harness is tightly
connected to the module. Verify that you have all wires
connected and in the right order.
- Conduct the following test to verify if the problem is the
module or valve. To measure voltages, turn the multimeter
to "DC", place the red lead from the multimeter to the screw
on the terminal block for the wire you are checking, touch
black lead to ground (valve body). Importantly, a "zero"
volts reading does not automatically indicate a bad module,
there may be too little resistance in the valve solenoid.
Check if the green wires is disconnected from the valve.
The voltage output from the module should be between 1.5
and 3 volts.
- Check all seals.
- Ensure door is secured properly.
- Check to ensure venting is properly sealed or restrict vent
exit with restrictor plate. Restrictor plate not available in
some models.
- Remove blockage. In really cold conditions, ice buildup
may occur on the terminal and should be removed as
required. To minimize this from happening again, it is
recommended that the vent lengths that pass through
unheated spaces (attics, garages, crawl spaces) be
wrapped with an insulated mylar sleeve. Prevent sleeve
from sagging. Contact your local authorized dealer for
more information.
- Clean the glass with a recommended appliance glass
cleaner. DO NOT CLEAN GLASS WHEN HOT! If deposits
are not cleaned off regularly, the glass may become
permanently marked.
42.13_2B