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Page Title: Table 5-1. Troubleshooting Chart
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5-5.  Troubleshooting  Chart by  a  list  of  probable  causes  of  the  trouble.  The Troubleshooting  procedures  for  direct  and  general corrective  action  recommended  is  described  op- support  maintenance  are  listed  in  Table  5-1.  Each posite  the  probable  cause. trouble  symptom  or  malfunction  stated  is  followed Table 5-1. Troubleshooting Chart Malfunction 1. Compressor will not start. 2. Compressor starts but goes out on overload. 3. Little or no heating capacity. 4.  Insufficient  cooling. 5.  Low  suction  pressure. 6. Low discharge pressure. 7.  Low  suction  and  discharge pressure. Probable  Cause a. Open control circuit. b.  Defective  circuit  breaker. c.  Defective  starting  relay  or capacitor (single phase com- pressor. d. Defective phase sequence relay (three  phase  compressor). e.  Defective  high  or  low  pressure cutout  switch. f.  Defective compressor motor or thermal  protector. a.  Defective  compressor  run capacitor  (single  phase  com- pressor). b.  Defective  compressor. a.  Loose  electrical  connection  or faulty  wiring. b.  Defective  temperature  selector switch or mode selector switch. c. Defective heaters. d. Defective heater high temperature cutout  switch. e. Defective heater relay. f. Defective evaporator fan motor. a. Low refrigerant charge. b.  Dehydrator  clogged. c.  Pressure  regulator  valve  defective. d. Air in refrigerant system. e.  Thermal  expansion  valve  defective. f.  Defective  solenoid  valve. g. Defective  quench  thermal  ex- pansion valve. a.  l)efective  thermal  expansion  valve. b. Dehydrator clogged or defective. c. Pressure regulating valve defective. a. Compressor  not pumping due to defective  compressor b. Defective high-low condenser fan thermostatic  switch. a. Lack of refrigerant. b.  Defective  thermal  expansion  valve. Corrective  Action a. Make continuity check of control circuit (para 4-12). b. Replace  circuit breaker (para 4-50 through  4-54). c. Replace defective capacitor or relay (para 4-61). d. Replace defective relay (para 4-50 thru 4-54). e. Replace defective switch (para 5- 21). f. Replace compressor (para 5-17). a. Replace capacitor (para 4-61). b.  Replace  compressor  (para  5-17). a.  Check  wiring  and  repair  if necessary  (para  4-33). b. Replace defective switch (para 4- 44 thru 4-48). c.  Replace  defective  heaters  (para  4- 35). d.  Replace  defective  thermostatic switch (para 4-34). e.  Replace  defective  heater  relay (para 4-50 thru 4-54). f. Repair motor (para 6-8). a. Charge refrigerant system (para 6- 3). b.  Replace  clogged  dehydrator  (para 5-24). c. Replace defective valve (para 5- 31). d. Purge and charge system (para 6- 3). e. Replace defective valve (para 5- 28). f. Replace defective solenoid valve (para 5-27). g.  Replace  defective  valve  (para  5- 29). a.  Replace  defective  valve  (para  5- 28). b.  Remove  restriction  or  replace dehydrator (para 5-24). c. Replace defective valve (para 5- 31). a.  Replace  defective  compressor (para 5-17). b. Replace defective switch (para 4- 41). a. Check sight glass for bubbles or milky  appearance and check system   for leaks (para 4-64). Repair leaks and add refrigerant as  necessary. b. Replace valve (para 5-28). 5-3

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