Table 3-1. Troubleshooting

TM 55-1905-223-24-17

SYMPTOM INDEX - CONT

Troubleshooting

Procedure

Low suction pressure

Item 8

No cooling - blower does not run

Item 12

No cooling - blower running

Item 13

Partial or insufficient cooling - blower

Item 14

running

Water leaking from the unit

Item 15

Table 3-1 lists the common fault conditions that may be found during operation or maintenance of the

equipment. Look for causes and do corrective actions in the order listed. This manual cannot list every

symptom that may show up, and it cannot list all of the possible causes and corrective actions. If a symptom is

not listed, or if it keeps up after you have performed the corrective actions, notify your supervisor.

Table 3-1. Troubleshooting

Malfunction

Test or Inspection

Corrective Action

HEATING

No heat - fan/blower running.

STEP 1.

Check for open manual or automatic limit switch. Reset manual limit switch. If trips again,

check for defective manual and automatic limit switch. Replace as required (paragraphs 3-

12 and 3-13).

STEP 2.

Check for defective air flow switch on duct heaters. Check for air flow to heater. Replace

defective air flow switch as required (paragraphs 3-11 and 3-13).

Not enough heat.

STEP 1.

Check for defective air flow switch. Replace as required (paragraphs 3-11 and 3-13).

STEP 2.

Check for element failure

Clean and secure connections.

3-3