Piper Navajo Chieftain PA-31-350 Service Manual page 816

Ventilating air blower
fails to run.
Combustion air blower
fails to run.
NAVAJO CHIEFTAIN SERVICE MANUAL
TABLE XIII-I. TROUBLESHOOTING
CHART (HEATING SYSTEM) (cont.)
Trouble Cause
Remedy
Heater tails to light.
Cycling switch open. Replace if defective.
(cont.)
Duct switch open.
Bad spark plug.
Incorrect gap setting.
Heater switch "OFF".
Broken or loose wiring
to motor.
Circuit breaker open.
Worn motor brushes.
Blower wheel jammed.
Motor burned out.
Detecti e radio-noise
filter.
Faulty wiring to motor.
Poor ground connection.
Worn motor brushes.
Blower wheel jammed.
(Usually indicated by
hot motor housing.)
Defective radio-noise
filter.
Operate control to see if
switch will come on. Re-
place switch if defective.
Replace plug.
Reset gap setting.
Energize the heater switch.
Check and repair wiring
Close circuit breaker.
Replace motor brushes
Remove and check the ven-
tilating air blower wheel
and realign if necessary.
Remove blower assembly and
replace motor.
Replace tilter.
Inspect and replace faulty
wiring.
Tighten ground screw.
Be sure any metal preser-
vative has been removed.
Replace motor brushes.
Overhaul the combus-
tion air blow er.
Replace filter.
I
Revised: 10/15/82
4C24
HEATING AND
VENTILATING
SYSTEM
4C24