Piper PA-44-180 SEMINOLE Maintenance Manual page 115

CHART 2101. TROUBLESHOOTING (JANITROL HEATER) (cont)
Trouble
Heater fires but burns
unsteadily.
DO NOT CREATE A SPARK GAP BY HOLDING THE LEAD TO THE
HEATER JACKET. THIS CAN RESULT IN DAMAGE TO THE LEAD AND
IGNITION UNIT AND THE OPERATOR MAY RECEIVE AN
ELECTRICAL SHOCK.
Heater starts then goes out.
PIPER AIRCRAFT
PA - 4 4 - 1 8 0 / 1 8 0 T
AIRPLANE MAINTENANCE MANUAL
Cause
Insufficient fuel supply.
— CAUTION —
Spark plug partially fouled.
Loose primary connection
at ignition assembly.
Faulty vibrator.
Combustion air blower speed
fluctuates. (Can be caused by
low voltage, loose blower
wheel, worn brushes or motor.)
High voltage leak in lead
between ignition assembly
and spark plug.
Inoperative ignition
assembly.
Restriction in fuel nozzle
orifice.
Nozzle loose in retainer or
improper spray angle.
Lack of fuel at heater.
1E19
Remedy
Inspect fuel supply to heater,
including shutoff valve,
solenoid valve fuel pump and
fuel lines. Make necessary
repairs.
Replace spark plug.
Tighten the connection.
Replace the vibrator.
Remove and overhaul the
combustion air blower assembly
as required or correct low
voltage condition.
Replace ignition assembly.
If vibrator is in good condition,
replace ignition assembly only.
Remove nozzle for cleaning
or replacement.
Tighten or replace the nozzle
as required.
Check fuel supply through
all components from the
tank to the heater. Make
necessary corrections.
Revised: May 15, 1989
2 1 - 0 2 - 0 0
Page 21-04