Daikin DZ20VC - Page 54

SERVICING
54
INDOOR UNIT (DV*PEC*) ERROR CODES
Error
Code
Control Board
LED Display
Transmitted Climate
Talk Message *1
Description Possible Causes Corrective Actions
b4 E_b4
Blower Trip or Lost Rotor (MOTOR TRIPS)
Blower Motor - Current Trip
(or) Lost Rotor
• Fan/motor obstruction or abnormal motor loading • Power interruption (low voltage) • High loading conditions, blocked filters • Blockage in the airflow (ductwork) or ductwork
• Check for obstruction on the fan/motor/ductwork • Verify the input voltage at the motor • Check filters, grills, duct system, coil air inlet/outlet for blockages. • Replace motor
b6 E_b6
Voltage or Temperature Trip (MOTOR VOLTS)
• Blower motor stops for over/under voltage • Bower motor stops due to control board over heating
• High AC line voltage to ID blower • Low AC line voltage to ID blower • High ambient temperatures • Fan/motor obstruction or blockage in the airflow
• Verify line voltage to blower is within the range specified on the ID blower rating plate • See "Installation Instructions" for installation requirements • Check power to air handler blower • Check for obstruction on the fan/motor/ductwork • Check wiring • Replace motor
b7 E_b7
Incomplete
Parameters Send to
Motor (MOTOR
PARAMS)
ID blower motor does not
have required parameters
to function. Motor fails to
start 40 consecutive times.
• Wrong / no shared data on the network • Locked motor rotor condition
• Check for locked rotor condition (see above error code for details) • Replace circuit board or motor
b9 E_b9 No Display
Low Indoor Airflow (without
Electric Heat mode)
• Fan/motor obstruction or blocked filters • Restrictive ductwork or ductwork undersized • ID motor failure
• Check for obstruction on the fan/motor • Check ductwork/filter for blockage, clean filters • Remove obstruction. Verify all registers are fully open • Check the connections and the rotation of the motor • Verify the input voltage at the motor • Verify ductwork is appropriately sized for system. Resize/replace ductwork if needed • Re
p
lace motor
9b E_9b
LOW ID AIR EH
MODE
Low Indoor Airflow (with Electric Heat mode)
• Fan/motor obstruction or blocked filters • Restrictive ductwork or ductwork undersized • ID motor failure • Combination mistake of outdoor unit and indoor unit
• Check for obstruction on the fan/motor • Check ductwork/filter for blockage, clean filters • Remove obstruction. Verify all registers are fully open • Check the connections and the rotation of the motor • Verify the input voltage at the motor • Verify ductwork is appropriately sized for system. Resize/replace ductwork if needed • Replace motor
70 E_70 EEV OPEN CKT
EEV disconnection detected
• Indoor EEV coil not connected • Incorrect wiring to EEV
• Check Indoor EEV coil connection (Control board and junction connector) • Replace EEV coil • Check the resistance value of EEV coil (refer service manual) • Re
p
lace the control board
73 E_73 LIQ TEMP FLT
Liquid side thermistor
abnormality
• Open (or) short circuit of the liquid thermistor (X5A) • Liquid thermistor reading incorrect or values outside the normal range
• Check the connection to liquid thermistor (Control board and junction connector) • Check the resistance value of the thermistor (refer service manual) • Replace thermistor • Replace the control board
74 E_74 GAS TEMP FLT
Gas side thermistor
abnormality
• Open (or) short circuit of the gas thermistor (X5A) • Gas thermistor reading incorrect or values outside the normal range
• Check the connection to gas thermistor (Control board and junction connector) • Check the resistance value of the thermistor (refer service manual) • Replace thermistor • Replace the control board
75 E_75 PRESSURE FLT
Pressure sensor
abnormality
• Open (or) short circuit of the Pressure sensor (X15A) • Pressure sensor reading incorrect or values outside the normal range
• Check the connection to pressure sensor (Control board and junction connector) • Check the output voltage of the pressure sensor (refer service manual) • Replace pressure sensor • Replace the control board
77*
2
E_77 No Display
Indoor Unit - Thermostat
communication error (start-
up & during operation)
• Incorrect wiring between ID unit and thermostat • Thermostat failure • Power interruption (low voltage)
• Check for thermostat and indoor unit wiring • Verify the input voltage at the ID unit and thermostat • Replace control board or thermostat • Press "LEARN" button on control board for more than 5 seconds to reestablish network
(*1) This message is displayed when using the CTK04 thermostat. (*2)Network communication error (Refer to "NETWORK TROUBLESHOOTING")