MOTOR RUNS, BUT NO
COMBUSTION
Fuel supply blocked Check fuel supply by
loosening the fitting on the
outside of the heater and
checking for propane odor. If
propane odor is present, pull
off the igniter wire completely
and remove the igniter. Try to
start the heater and listen for
the solenoid click. Check for
the odor of propane in the
burner. If propane odor is
present at bulkhead fitting,
but not the burner head, the
solenoid valve is defective or
contaminated with some
foreign object. The solenoid
valve can become
contaminated when a liquid
take-off bottle is used
instead of the required vapor
take-off bottle. If the fuel
system is contaminated, the
lines and solenoid must be
cleaned with a degreasing
solvent.
Temperature control &/or
microswitch defective or out
of adjustment
Check temperature control
switch and microswitch and
microswitch for adjustment.
Adjust, repair, or replace as
necessary. See Section 6,
“Repairs and Adjustments”.
Ignition pack defective or
inoperative
Check for spark by holding
an insulated-handle
screwdriver with the shaft
grounded and the tip
approximately 1/8” away
from the high tension lug of
the ignition coil. There should
be a continuous strong
spark. If no spark is
produced, check that there is
voltage applied to the ignition
pack. If input voltage is
present and no spark or a
weak spark is produced,
replace or repair the ignition
pack.
Tilt switch defective,
improperly mounted or not
getting power
Check tilt switch. The switch
must be secure in its bracket
and be in the vertical position
with the electrical leads
pointing down. Check leads
on both sides of switch for
power. Replace if defective.
Igniter defective or
inoperative
Check the igniter. To check,
shut off the fuel tank and
depress the start switch until
the lines are purged of fuel.
Remove the burner head and
check the gap between the
igniter and the burner tube. It
should be 1/16” to 1/8”. With
the burner head grounded,
move the START-RUN-OFF
switch to the START position
and check the gap for spark.
If no spark is produced, the
igniter may be dirty or
defective. Before removing
the igniter from burner head,
check inside the burner head
to determine if any carbon
threads or chips are present
which could short the plug.
Fuel not suitable for
temperatures encountered
Check with your propane
supplier to be sure your fuel
is suitable for the
temperatures encountered.
Around -10°F, propane may
not produce enough
pressure to pass through the
regulator.
235REVISED:
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