TM 9-2350-247-20-1
COOLANT HEATER MALFUNCTIONSContinued
0086 00
HY
1. Check and see if heater exhaust is cold.
2. Is heater exhaust cold?
YES
NO
GO TO JY (PAGE 0086 00-10)
2HY
1. Loosen fuel inlet line (1) to heater with heater switch on START.
2. Does fuel fail to flow out of loosened fitting?
YES
NO
2HYN
1. Faulty igniter.
2. Notify your supervisor.
3HY
1. Inspect fuel lines and heater.
2. Are all lines free from kinks, restrictions, or other damage?
YES
NO
3HYN
1. Replace heater fuel lines as required
(WP 0475 00).
2. Verify no faults found.
4HY
1. Replace coolant heater fuel pump (WP 0475 00).
2. Verify no faults found.
IY
1. Check and see if fuel pump stays on.
2. Does fuel pump stay on?
YES
NO
IYN
1. Replace heater ON/OFF/START
switch (WP 0472 00).
2. Verify no faults found.
2IY
1. Check if flame detector switch has been adjusted.
2. Has flame detector switch been adjusted?
YES
NO
2IYN
1. Flame detector switch needs
adjustment.
2. Notify your supervisor.
0086 00-9