Troubleshooting Chart (Heating System) - Piper Navajo Chieftain PA-31-350 Service Manual

NAVAJO CHIEFTAIN SERVICE MANUAL
TABLE XIII-I.
TROUBLESHOOTING
CHART (HEATING SYSTEM)
Trouble
Cause
Remedy
Heater tails to
light.
Heater switch or cir-
cuit breaker open.
Turn on heater switch
or close circuit breaker.
Low voltage supply.
Apply external power
supply. Attempt to
start heater.
Fuel cut off from Turn on manual shut off
tank.
valve or master solenoid.
Restriction in fuel
Remove the nozzle and
nozzle orifice.
clean or replace it.
Suction leak ahead
Secure all fittings.
of pump.
Fuel heater solenoid
Remove and check sole-
not operating.
noid. Replace if faulty.
Insufficient fuel Low or no current
pressure.
to fuel pump Check
operation of pump
Fuel lines clogged or
Inspect all lines and con-
broken. nections. It may be nec-
essary to disconnect
lines at various point,
to determine where the
restriction is located.
Ignition vibrator
Replace vibrator.
inoperative.
Check for defective
ignition unit.
Regulator not
Check for low pressure
operating properly.
or replace regulator.
Manual reset limit
Press reset button firm-
(overheat) switch
ly and recheck to de-
open.
termine reason for
switch opening.
Combustion air pres-
Check for low blower
sure switch open. (De-
output due to low volt-
fective switch or low
age and correct it. If
combustion air blow er
switch is defective. re-
output.)
place it.
4C23
HEATING AND
VENTILATING SYSTEM
4C23
Revised: 10/15/82