Hartzell CD15K - 11.5 TABLE A TROUBLESHOOTING GUIDE

2900 Selma Highway, Montgomery AL 36108 USA
PH: +1.334.386.5400 (option 2) FAX: +1.334.386.5450 WEB: www.hartzell.aero
Page | 44
MM10001
Dated 1/1/08
Rev L dated 5/21/15
11.5 TABLE A TROUBLESHOOTING GUIDE
PROBLEM OCCURS = GROUND OPERATION AIR OPERATION BOTH
TROUBLE
PROBABLE CAUSE
REMEDY
Heater fails to start
1. No power to heater system
circuit breaker
2. Overheat Switch on heater
activated.
Turn off all switches; reset circuit
breakers, check fuses.
Auto switch. After 3-5 min. delay
should auto reset.
3. Faulty spark plug.
4. Improperly secured lead.
5. Faulty ignition unit.
6. Defective shielded lead.
7. Weak ignition
Inspect and repair or replace as
indicated for the separately provided
components.
Torque lead nut at igniter plug 15-
20 ft. lbs. and nut at ignition unit 12-
15 ft. lbs.
Replace ignition unit.
Replace lead.
Replace ignition unit.
8. External fuel system not
energized or operating
improperly.
9. Low fuel supply pressure.
10. Fuel filter clogged at heater.
(Air should pass thru with little
restriction)
11. Dirty or clogged spray nozzle.
Check operation of components and
condition of all fuel lines and wiring
connections.
Replace fuel filter/fuel pump.
Replace element P/N CD21346.
(Recommend replacement every 500
hrs.)
Replace spray nozzle.
12. Insufficient combustion air/
13. Combustion air pressure switch
will not close.
14. Faulty combustion air pressure
switch.
Remove cause of clogging/replace
motor.
Check blower operation.
Adjust or replace pressure switch.
Heater is cycled off
and on by overheat
switch, indicated by
heater cycle spread
of 3-5 minutes.
1. Cycling switch set too high.
2. Cycling switch is faulty.
3. Vent blower damaged or
defective.
4. Obstruction in ventilating air
system.
5. Overheat switch faulty.
Adjust duct temperature 220º to
250º F.
Replace.
Repair or replace blower assembly.
Remove obstruction.
Replace. Not adjustable.