Piper PA-44-180 SEMINOLE Maintenance Manual page 114

CHART 2101. TROUBLESHOOTING (JANITROL HEATER) (cont)
Trouble
Heater fails to light. (cont)
Ventilating air blower fails
to run.
Combustion air blower fails
to run.
PIPER AIRCRAFT
PA - 4 4 - 1 8 0 / 1 8 0 T
AIRPLANE MAINTENANCE MANUAL
Cause
Combustion air pressure switch
open. (Defective switch or low
combustion air blower output.)
Cycling switch open.
Duct switch open.
Heater switch "OFF."
Broken or loose wiring to
motor.
Circuit breaker open.
Worn motor brushes.
Blower wheel jammed.
Motor burned out.
Defective 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.
Faulty or burned out motor.
1E18
Remedy
Check for low blower output
due to low voltage and correct
it. If switch is defective,
replace it.
Replace if defective.
Operate control to see if
switch will come on. Replace
switch if defective.
Energize the heater switch.
Check and repair wiring.
Close circuit breaker.
Replace motor brushes.
Remove and check the ventilating
air blower wheel and
realign if necessary.
Remove blower assembly and
replace motor.
Replace filter.
Inspect and replace faulty
wiring.
Tighten ground screw. Be sure
any metal preservation has
been removed for good ground
connection.
Replace motor brushes.
Overhaul the combustion
air blower.
Replace filter.
Remove combustion air
motor for overhaul or replacement
of motor.
Page 21-03
Revised: May 15, 1989
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