A.O. Smith CAHP-120 Series, User Manual

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UP ELEMTLOST Upper element is unconnected. Call the service phone.
ST MACHERR
State machine redundant failed. Call the service phone.
LOW
SHORT
Lower tank temperature sensor is short. Call the service phone.
LOW OPEN Lower tank temperature sensor is open. Call the service phone.
LOW ADERR
Lower tank temperature AD channel is error. Call the service phone.
COIL SHORT Coil temperature sensor is short. Call the service phone.
COIL OPEN Coil temperature sensor is open. Call the service phone.
COIL ADERR
Coil temperature AD channel is error. Call the service phone.
EEPROM FAULT EEPROM is fault. Call the service phone.
COIL DIRTY
Too much dust in evaporator assembly. Turn off the unit and clean the evaporator.
LOW ELEMTLOST Lower element is unconnected. Call the service phone.