TM-9-2350-277-20-1

CARRIER M113A3, M577A3, M1059A3, M1064A3, M1068A3 AND M58

TECHNICAL MANUAL; UNIT MAINTENANCE MANUAL VOLUME 1 OF 6

TM-9-2350-277-20-1 - Page 441 of 855

TM 9-2350-277-20-1

COOLANT HEATER MALFUNCTIONS — Continued

0089 00

4Y

1.

Does HEATER ON indicator come on in less than 3 minutes?

4YN

GO TO

GY

(PAGE 0089 00-9)

5Y

1.

Turn HEATER SWITCH to ON. Do not stop at OFF position.

2.

Do blower and pump stay ON?

5YN

1.

Replace heater ON/OFF/START

switch (WP 0737 00).

2.

Verify no faults found.

6Y

1.

Feel exhaust temperature.

2.

Does heater continue to produce hot air for 10 minutes?

6YN

1.

Shut off heater. See TM

9-2350-277-10.

2.

Replace heater (WP 0728 00).

3.

Verify no faults found.

7Y

NOTE

Heater will shut off prematurely if air inlet temperature is

60 degrees or above. This is normal.

1.

Run heater on HI for 10 minutes.

2.

Does heater continue producing hot air?

7YN

1.

Shut off heater. See TM

9-2350-277-10.

2.

Replace heater (WP 0728 00).

3.

Verify no faults found.

8Y

1.

Turn HEATER SWITCH to OFF.

2.

Does blower remain on?

8YN

1.

Heater does not purge.

2.

Replace heater (WP 0728 00).

3.

Verify no faults found.

9Y

1.

Listen to heater until coolant pump and blower shut off.

2.

Do coolant pump and blower shut off in less than 5 minutes?

9YN

1.

Faulty heater flame detector switch.

2.

Replace flame detector switch

(WP 0734 00).

3.

Verify no faults found.

008900-2

Change 5