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Model reference

Lennox 50A93

Heat Pump

11 documents50 error codes6 service modes

Available documentation

Service Manual

  • 14HPX Series Service Literature24 pg
    Covers this model
  • XP19 Series Service Literature27 pg
    Covers this model
  • HPXA16 Series23 pg
    Covers this model
  • HP13 SERIES UNITS Service Literature15 pg
    Covers this model
  • XP15 Series Service Literature21 pg
    Covers this model
  • 13HPX Series Service Literature20 pg
    Covers this model
  • HPXA12 Series Units - Service Literature23 pg
    Covers this model
  • XP14 Series Service Literature23 pg
    Covers this model
  • XP13 Series Service Literature16 pg
    Covers this model
  • XP16 Series Service Literature24 pg
    Covers this model
  • XPG20 Series Service Literature36 pg
    Covers this model
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Error codes (50)

CodeMeaning
1Long Run Time2System Pressure Trip or Discharge Sensor Fault3Short Cycling4Locked Rotor5Open Circuit6Open Start Circuit7Open Run Circuit8Welded Contactor9Low VoltageAlternating FAST FlashCoil sensor problemAlternating FAST Flash (Green/Red)Coil sensor problemAlternating SLOW Flash5-minute anti-short cycle delay (initial power up, safety trip, or end of room…Alternating SLOW Flash (Green/Red)5-minute anti-short cycle delay after initial power up, safety trip, or end of…DS2 Alternating FAST Flash / DS1 Alternating FAST FlashCoil sensor problemDS2 Alternating SLOW Flash / DS1 Alternating SLOW Flash5-minute anti-short cycle delay due to initial power up, safety trip, or end of…DS2 OFF / DS1 OFFNo power (24V) to control terminals R & C or board failure.DS2 OFF / DS1 ONLow Pressure LOCKOUTDS2 OFF / DS1 SLOW FlashLow Pressure FaultDS2 ON / DS1 OFFHigh Pressure LOCKOUTDS2 ON / DS1 ONCircuit board failureDS2 Simultaneous FAST Flash / DS1 Simultaneous FAST FlashAmbient sensor problemDS2 Simultaneous SLOW Flash / DS1 Simultaneous SLOW FlashNormal operationDS2 SLOW Flash / DS1 OFFHigh Pressure FaultDS2:Alternating FAST Flash / DS1:Alternating FAST FlashCoil sensor problemDS2:Alternating SLOW Flash / DS1:Alternating SLOW Flash5-minute anti-short cycle delay due to initial power up, safety trip, or end of…DS2:FAST Flash / DS1:OFFDischarge sensor lockoutDS2:FAST Flash / DS1:ONDischarge line temperature lockoutDS2:OFF / DS1:FAST FlashDischarge sensor faultDS2:OFF / DS1:OFFNo power (24V) to board terminals R & C or board failure.DS2:OFF / DS1:ONLow pressure lockout
View all 50 error codes
DS2:OFF / DS1:SLOW FlashLow pressure faultDS2:ON / DS1:OFFHigh pressure lockoutDS2:ON / DS1:ONCircuit board failureDS2:Simultaneous FAST Flash / DS1:Simultaneous FAST FlashAmbient sensor problemDS2:Simultaneous SLOW Flash / DS1:Simultaneous SLOW FlashNormal operationDS2:SLOW Flash / DS1:OFFHigh pressure faultDS2:SLOW Flash / DS1:ONDischarge line temperature faultGreen FAST Flash / Red OFFDischarge sensor lockout (5 strikes)Green FAST Flash / Red ONDischarge line temperature lockout (5 strikes)Green OFF / Red FAST FlashDischarge sensor faultGreen OFF / Red SLOW FlashLow pressure faultGreen ON / Red OFFLow pressure lockout (5 strikes)Green ON / Red ONCircuit board failureGreen SLOW Flash / Red OFFHigh pressure faultGreen SLOW Flash / Red ONDischarge line temperature faultOFF/OFFNo power (24V) to board terminals R & C or board failure.Simultaneous FAST FlashAmbient sensor problemSimultaneous FAST Flash (Green/Red)Ambient sensor problemSimultaneous SLOW FlashNormal operationSimultaneous SLOW Flash (Green/Red)Normal operation

Service modes (6)

  • 5-Strike Lockout Reset["Cycle OFF the 24-volt power to the control board (R terminal), then restore power.","OR short the…
  • Compressor Modulation Operational Check["Turn main power OFF to outdoor unit.","Adjust room thermostat set point above (heating) or below…
  • Compressor Two-Stage Modulation Operational Check["Turn main power OFF to outdoor unit.","Adjust room thermostat set point above (heating) or below…
  • Defrost Board Test Mode["Ensure Y1 input is active (ON) and the O room thermostat terminal into board is inactive (heating…
  • LSOM Installation Verification Test["Test 1 (Trip LED)
  • Test Mode (Defrost Control)["Ensure Y1 is energized (active ON) and the O room thermostat terminal into the board is…

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