Haier 4HP16 Installation Instructions Manual

507919-01Page 16 of 21Issue 1946DS1 and DS2 System Status, Fault and Lockout CodesDS2GreenDS1Red Type Condition / Code Possible Cause(s) SolutionOFF OFF Status Power ProblemNo power (24V) to controlboard terminals R and C orcontrol board failure.1. Check control transformer power (24V).2. If power is available to control board andLED(s) do not light, replace control board.SimultaneousSLOW Flash Status Normal operation Unit operating normally or instandby mode. None required.AlternatingSLOW Flash Status 5-minute anti-shortcycle delayInitial power up, safety trip, endof room thermostat demand. None required (jumper TEST pins to override)SimultaneousFAST Flash Fault Ambient SensorProblemSensor being detected open or shorted or out of temperature range. Controlboard will revert to time/temperature defrost operation. (System will still heat orcool).AlternatingFAST Flash Fault Coil SensorProblemSensor being detected open or shorted or out of temperature range. Controlboard will not perform demand or time/temperature defrost operation. (Systemwill still heat or cool.)ON ON Fault Demand DefrostControl FailureIndicates that demand defrost control has internal component failure. Cycle24VAC power to control board. If code does not clear, replace control board.OFF SLOWFlash Fault Low Pressure Fault • Restricted air flow overindoor or outdoor coil.• Improper refrigerant chargein system.• Improper metering deviceinstalled or incorrectoperation of metering device.• Incorrect or improper sensorlocation or connection tosystem.• Remove any blockages or restrictions fromcoils and/or fans. Check indoor and outdoorfan motor for proper current draws.• Check system charge using subcoolingmethod.• Check system operating pressures andcompare to unit subcooling tables located onunit access panel.• Make sure all pressure switches and sensorshave secure connections to system toprevent refrigerant leaks or errors in pressureand temperature measurements.OFF ON Lockout Low PressureLockoutSLOWFlash OFF Fault High Pressure FaultON OFF Lockout High PressureLockout(Each fault adds 1 strike to that code’s counter; 5 strikes per code = LOCKOUT)Table 6. Control Board Diagnostic LEDs