Error Code Based Troubleshooting; Aa-00" - Back Up Heater Safety Error - Daikin EDLQO5CAV3 Service Manual

ESIE15-08B | Part 2. Troubleshooting

2. Error code based troubleshooting

Overview of error codes:
"AA-00" - Back up heater safety error ............................................19
"AC-00" - Booster heater thermal protector is open .......................20
"AH-00" - Disinfection operation error ............................................21
"AJ-03" - Domestic hot water heat duration is too long (warning) ..21
"A1-00" - Zero cross detection problem .........................................22
"A1-01" - Hydro PCB A1P abnormality ..........................................22
"A5-00" - Freeze-up prevention (refrigerant) ..................................22
"CJ-02" - User interface room temperature error ...........................23
"C0-00" - Flow sensor error............................................................23
"C0-01" - Flow switch warning .......................................................23
"C0-02" - Flow switch error ............................................................24
"C0-01" - Flow switch warning .......................................................23
"EA-00" - 4-way valve malfunction .................................................24
"EC-00" - Domestic hot water temperature error ...........................25
"E1-00" - Outdoor unit PCB abnormality ........................................25
"E3-00" - High pressure abnormality (refrigerant) ..........................26
"E4-00" - Actuation of sensor (low pressure) .................................26
"E5-00" - Compressor motor lock...................................................27
"E6-00" - Compressor startup defect..............................................27
"E7-00" - Malfunction of outdoor unit fan motor .............................28
"E8-00" - Power input overvoltage .................................................28
"E9-00" - Expansion valve abnormality ..........................................29
"F6-00" - Abnormal high pressure in cooling..................................30
"HC-00" - Domestic hot water temperature error ...........................31
"H0-00" - Voltage/current sensor problem......................................31
"H1-00" - Optional temperature sensor error (indoor ambient) ......32
"H3-00" - High pressure switch abnormality...................................32
"H6-00" - Malfunction of position detection sensor ........................32
"H8-00" - Malfunction of compressor input (CT) system ................33
"H9-00" - Outdoor air thermistor (R3T) abnormality .......................33
"JA-00 / JI-00" - Pressure sensor abnormality ...............................34
"J3-00" - Discharge thermistor (R1T) abnormality .........................34
"J6-00" - Heat exchanger thermistor (R2T) abnormality ................34
"J7-00" - Malfunction of intermediate heat exchanger thermistor ..35
"J8-00" - Malfunction of liquid pipe thermistor ................................35
"LC-00" - Transmission system abnormality ..................................35
"L1-00" - Outdoor main PCB abnormality.......................................36
2.1. "AA-00" - Back up heater safety error
Trigger
Thermal protector Q1L is activated (open
circuit). Water temp > 90°C.
Possible cause
Air in water circuit / backup heater.
Increased water temperature by external
heat source.
Faulty thermal protector Q1L.
Faulty outlet backup heater thermistor.
Faulty outlet water heat exchanger ther-
mistor.
Faulty backup heater assy.
19/07/16
Daikin Altherma Monobloc CA
"L3-00" - Switch box temperature abnormality .............................. 36
"L4-00" - Radiation fin temperature abnormality............................ 37
"L5-00" - Output overcurrent detection .......................................... 37
"L8-00" - Electronic thermal overload ............................................ 38
"PJ-00" - Defective capacity setting............................................... 38
"UA-00" - Indoor-Outdoor PCB combination ................................. 38
"UA-16" - Communication warning between hydro PCB A1P and
control box PCB ............................................................................. 39
"UA-21" - PCB combination malfunction ....................................... 39
UA-22" - Communication warning between control box and option
box ................................................................................................. 40
"UA-60" - PCB combination malfunction ....................................... 40
"U0" - Refrigerant shortage ........................................................... 41
"U7-00" - Transmission malfunction between outdoor unit main PCB
and inverter PCB............................................................................ 43
"UF-00" - Communication error between hydro PCB A1P and out-
door main PCB or gas shortage..................................................... 41
"U3-00" - Abnormal stop of underfloor heating dry-out scheduled
operation ........................................................................................ 42
"U4-00" - Defective indoor-outdoor transmission .......................... 42
"U5-00" - Transmission error between user interface and hydro PCB
A1P ............................................................................................... 43
"U7-00" - Transmission malfunction between outdoor unit main PCB
and inverter PCB............................................................................ 43
"7H-04" - Water flow abnormality during DHW operation.............. 44
"7H-05" - Water flow abnormality during space heating operation 45
"7H-06" - Water flow abnormality during defrost/cooling operation 45
"8F-00" - Backup heater outlet water temperature error during
domestic hot water operation ......................................................... 45
"8H-00" - Backup heater outlet water temperature error ............... 46
"80-00" - R4T entering water thermistor abnormality .................... 46
"81-00" - Leaving water thermistor R1T abnormality..................... 46
"89-01" - Plate heat exchanger freeze-up error............................. 47
"89-02" - Plate heat exchanger freeze-up warning during space
heating / DHW production .............................................................. 47
"89-03" - Plate heat exchanger warning during defrost ................. 48
Effect
Unit will stop operating.
Check
Check if all air purge valves are open.
Check if air purge valves are installed on
all highest points of the field installed
water circuit.
Check if another heat source is installed
on the same water circuit.
Check thermal protector backup heater
Q1L (see page 79).
Check outlet backup heater thermistor
(see page 70).
Check outlet water heat exchanger ther-
mistor (see page 70).
Check backup heater kit (see page 65).
2. Error code based troubleshooting
Reset
Power reset + reset via user interface +
pressing the button on the Q1L (if
activated).
Corrective action
Purge the unit and field supplied water
system and backup heater. Refer to the
Installer Reference Guide.
Correct hydraulic field circuit. Refer to the
Installer Reference Guide.
Replace thermal protector backup heater
Q1L when required.
Replace outlet backup heater thermistor
when required.
Replace outlet water heat exchanger ther-
mistor when required.
Replace the backup heater assy when
required.
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