Piper Navajo PA-31 Service Manual page 972

PIPER NAVAJO SERVICE MANUAL
TABLE XIII-I. TROUBLESHOOTING CHART (HEATING SYSTEM) (cont.)
Trouble Cause Remedy
Heater starts; then goes
out.
Lack of fuel at heater. Check fuel supply through
all components from the
tank to the heater. Make
necessary corrections.
Inoperative or chat-
tering combustion air
pressure switch.
Inoperative overheat
switch.
Inoperative cycling
switch.
Low voltage.
Adjust or replace switch.
(Refer to Paragraph 13-36.)
Replace switch. (Refer
to Paragraphs 13-34 and
13-52.)
Adjust or replace the
switch. (Refer to Para-
graphs 13-34 and 13-52.)
Attach external power.
Heater fails to shutoff. Fuel solenoid valve in
heater stuck open.
Remove and replace sole-
noid assembly. (Refer to
Paragraphs 13-40, 13-44
and 13-47.)
Inoperative duct and
cycling switch.
Defective heater switch.
Check and repair. (Refer
to Paragraphs 13-34 and
13-38.)
Replace the heater switch.
Reissued: 10/12/79
HEATING AND VENTILATING SYSTEM
5D18