Table 1. Heating Systems Troubleshooting Procedures - continued

TM 9-2320-361-24-1

0015 00

HEATING SYSTEMS TROUBLESHOOTING (Contd)

Table 1. Heating Systems Troubleshooting Procedures (Contd).

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

Test 1. Check horn operation. Place

1. If horn fails to operate, go to

2. HOT WATER

power accessory switch to the

WP 0014 00, table 1,

PERSONNEL HEATER

ON position. Push horn button.

malfunction 10.

DOES NOT OPERATE

OR DOES

2. If horn is operational, voltage is

NOT OPERATE

present at input of heater circuit

IN LOW POSITION

breaker. Go to test 2.

3. If heater high/low switch operates

in high but fails to operate in low,

go to test 5.

Test 2. Check heater high/low switch

for power input.

1. Set multimeter to a range that

will measure 24 VDC.

2. Disconnect lead 10 at rear of

heater switch.

3. Touch multimeter positive lead

to contact end of lead 10 at

heater switch.

4. Touch multimeter negative lead 1. If voltage is present, go to test 3.

to frame ground. Voltage

2. If voltage is not present, repair or

should be present.

replace lead 10 (WP 0090 00).

Test 3. Test for power output at heater

high/low switch.

1. Set multimeter to a range that

will measure 24 VDC.

2. Reconnect lead 10 and

disconnect lead 400 at rear of

heater switch at the high

switch side. Place switch in the

high position.

3. Touch positive lead of multimeter

to contact end of power output

at the heater switch.

4. Touch multimeter negative lead 1. If voltage is present, go to test 4.

to frame ground. Voltage

2. If voltage is not present, replace

should be present.

heater switch (WP 0116 00).

TEST 2

STEPS 3

AND 4

HEATER

TEST 3

SWITCH

LEAD

STEPS 3

400

AND 4

0015 00-7