Cheyenne PA-31T CHEYENNE, Service Manual

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5D20
TABLE XIII-V. TROUBLESHOOTING CHART (AUXILIARY HEATER)
No auxiliary heat; no airflow at Control circuit breaker open. Reset circuit breaker.
vents (No ammeter load).
Control circuit breaker fails to Replace circuit breaker.
close.
Control circuit breaker fails to Replace circuit breaker and fuse
open. (Find cause for circuit
overload).
Control switch fails to make. Replace switch.
Power solenoid fails to close. Replace solenoid.
Open circuit in system wiring. Locate and correct fault.
No airflow at vents (High Auxiliary heat relay fails to Replace relay.
ammeter load). actuate.
Recirculating fan fails to Replace fan.
operate.
Open or short in fan circuit Locate and correct fault.
wiring.
Reduced heat output; reduced Resistive wire element open. Replace element.
ammeter reading.
No heat at vents; ammeter Positive bus shorts to bus. Replace assembly.
reading.
Open or short in heater circuit Locate and correct fault.
wiring.
Heater continues to operate. Control switch fails to open. Replace switch.
Power solenoid fails to open. Replace solenoid.
Circuit breaker fails to stay Short in system wiring. Locate and correct fault.
reset.
System overheat (No airflow). Find cause for lack of air flow.
Faulty circuit breaker. Replace circuit breaker.
Trouble Cause Remedy
Reissued: 2/6/81
PIPER CHEYENNE SERVICE MANUAL
ENVIRONMENTAL CONTROL SYSTEM
PA-31T AND PA-31T1