Daikin DV25PECB14 - Page 20

20
TROUBLESHOOTING
b4
E_b4
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 undersized
• 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
• Blower motor stops for over
/under
voltage
• Bower motor stops due to PCB
over heating
• High AC line voltage to ID blower •
Low AC line voltage to ID blower
• High ambient temperatures • Incorrect wiring
• 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
ID blower motor does not have
required parameters to function.
• 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
Low Indoor Airflow
(without Electric Heat mode)
• Fan/motor obstruction or blocked filters • Restrictive ductwork or ductwork undersized • Wiring disconnected • Wrong outdoor/indoor combination • 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
• Replace motor
9b
E_9b
Low Indoor Airflow
(with Electric Heat mode)
• Fan/motor obstruction or blocked filters
•
Restrictive ductwork or ductwork undersized
• ID motor failure • Wiring disconnected
•
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 disconnection detected
• Indoor EEV coil not connected • Incorrect wiring to EEV
• Check Indoor EEV coil connection
(PCB and junction connector)
•
Replace EEV coil
• Check the resistance value of EEV coil
(
refer service manual)
• Replace the control board
73 E_73
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 (PCB and junction connector)
•
Check the resistance value of the thermistor (refer service manual)
•
Replace thermistor
•
Replace the control board
74
E_74
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 (
PCB and junction connector)
• Check the resistance value of the thermistor
(refer service manual)
• Replace thermistor • Replace the control board
75 E_75
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 (PCB and junction connector)
•
Check the output voltage of the pressure sensor (refer service manual)
•
Replace pressure sensor
•
Replace the control board
77 E_77
Indoor Unit - Thermostat
communication error
(start-up & during operation)
• Incorrect wiring between ID unit and thermostat. The system may have the communication error without error code 77 on the indoor PCB. Follow section 17.5 SYSTEM TROUBLESHOOTING • Thermostat failure • Power interruption (low voltage)
•
Check for thermostat and indoor unit wiring
• Verify the input voltage at the ID unit and thermostat After recovering the system with power supply, TSTAT ID NO COM will continue to be displayed on the thermostat within 2 minutes. The error code will be cleared automatically. • Replace control board or thermostat •
Press "LEARN" button on PCB for more than 5 seconds to reestablish network
Corrective Actions
Error
Code
PCB LED Display
Description
P ossi bl e Ca u se s