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TM5-4120-377-14 l Problem  with  equalizing  solenoid  valve. l Problem  with  pressure  regulating  valve. l Internal   compressor   damage. (3)  Suction  pressure  too  low. Possible  causes: l Dirty   return   air   filter. l Discharge  or  return  air  louvers  closed. l Partially  blocked  discharge  or  return  air  ducts  or  openings. l Dirty   evaporator   coil. l Cold   return   air. l Low   refrigerant   charge. l Liquid   solenoid   valve   closed. l Fan  motor  not  operating. l Evaporator  fan  loose  on  motor  shaft. l Problem  with  expansion  valve  operation. l Expansion  valve  superheat  too  high. l Plugged   or   kinked   distributor   tube. l Suction  line  or  evaporator  coil  tubing  restriction. l Clogged    dehydrator    (filter-drier). l Moisture   in   refrigerant   system. (4)  Suction  pressure  too  high. Possible  causes: l High   return   air   temperature. l Open   equalizing   solenoid   valve. l Compressor   not   running. l Expansion  valve  bulb  damage  or  poor  contact  with  suction  line. l Internal   compressor   failure. l Problem  with  liquid  quench  expansion  valve. l Problem   with   regulating   valve. l Problem  with  expansion  valve. 5-20

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