Error Code Based Troubleshooting; Aa" - Back Up Heater Safety Error - Daikin EGSQH10S18AA9W Service Manual

ESIE13-03 | Part 2. Troubleshooting

2. Error code based troubleshooting

Overview of error codes:
"AA" – Back up heater safety error ................................................. 20
"AH" – Disinfection operation error ................................................. 21
"AJ-03" – Domestic hot water heat duration is too long (warning).. 21
"A1" – Hydro PCB abnormality ....................................................... 21
"CJ-02" – User interface room temperature error ........................... 22
"C0" – Flow sensor error................................................................. 22
"C4" – Refrigerant liquid thermistor R3T (A1P) abnormality........... 22
"EC" – Domestic hot water temperature error ................................ 22
"E1" – Refrigerant/brine PCB abnormality ...................................... 23
"E3" – High pressure abnormality................................................... 23
"E5" – Compressor motor lock........................................................ 23
"E7" – Brine flow error .................................................................... 24
"E9" – Expansion valve abnormality ............................................... 25
"F3" – Discharge pipe temperature control..................................... 25
"HC" – Domestic hot water temperature error ................................ 26
"H0-01" – Brine flow switch error .................................................... 26
"H1" – Optional temperature sensor error (indoor ambient) ........... 26
"H3" – High pressure switch system abnormality ........................... 26
"H9" – Outdoor air thermistor (R1T) abnormality............................ 27
"J1" – High pressure sensor abnormality........................................ 27
"J3" – Discharge thermistor abnormality......................................... 27
"J5" – Suction thermistor (R3T) abnormality................................... 27
"J6" – Heat exchanger refrigerant inlet thermistor (R4T) abnormality
....................................................................................................... 28
"J7" – Brine inlet thermistor (R5T) abnormality............................... 28
"J8" – Brine outlet thermistor (R6T) abnormality ............................ 28
"LC" – Transmission system abnormality ....................................... 28
2.1. "AA" – Back up heater safety error
Trigger
Thermal protector Q1L is activated (temp
> 92°C).
Possible cause
Air in water circuit / backup heater.
Increased water temperature by external
heat source.
Faulty thermal protector Q1L / hydro PCB
A1P.
Faulty thermistor R2T (after backup
heater) / hydro PCB A1P.
Faulty thermistor R1T (leaving water) /
hydro PCB A1P.
Faulty backup heater assy / hydro PCB
A1P.
Water pressure is too low
Water flow is too low.
Page 20
Ground source heat pump
"LH" – Converter attention ..............................................................29
"L1" – Refrigerant/brine PCB abnormality.......................................29
"L4" – Radiation fin temperature abnormality .................................29
"L5" – Output overcurrent detection................................................30
"L8" – Electronic thermal overload..................................................30
"L9" – Stall prevention (time lag).....................................................30
"P1" – Open phase or power supply voltage imbalance .................31
"P4" – Inverter radiation fin thermistor (R10T) error .......................31
"PJ" – Defective capacity setting ....................................................31
"UA" – PCB combination error ........................................................31
"U0" – Refrigerant shortage ............................................................32
"U1" – Reverse phase or open phase.............................................32
"U2" – Power supply voltage abnormality .......................................33
"U3-00" – Abnormal stop of underfloor heating dry-out scheduled
operation.........................................................................................33
"U4" – Defective indoor-outdoor transmission ................................33
"U5-00" – Transmission error between user interface and hydro PCB
........................................................................................................34
"7H-01" – Water flow abnormality ...................................................34
"7H-04" – Water flow abnormality during DHW operation...............35
"7H-06" – Water flow abnormality during pace heating operation...35
"8F" – Backup heater outlet water temperature error during domestic
hot water operation .........................................................................36
"8H" – Backup heater outlet water temperature error .....................36
"80" – R4T entering water thermistor abnormality ..........................36
"81" – Leaving water thermistor R1T abnormality...........................36
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 73).
Check thermistor R2T (see page
Check thermistor R1T (see page
Check backup heater (see page
Check the water pressure on the pressure
gauge.
Check the mimimum water flow required
for the system. Refer to "Installer Refer-
ence Guide".
2. Error code based troubleshooting
Reset
Power reset + reset via user interface +
pressing the button on the Q1L (if
activated).
Corrective action
Purge air out of unit and field supplied
water system and BUH. Refer to the
Installer Reference Guide.
Correct hydraulic field circuit. Refer to the
Installer Reference Guide.
Replace thermal protector backup heater
Q1L (see page 109) or hydro PCB A1P
(see page 93).
58). Replace thermistor R2T (see
hydro PCB A1P (see
58). Replace thermistor R1T (see
hydro PCB A1P (see
54). Replace the faulty components (backup
heater (see page
(see page 93).
Increase water pressure till ~2bar. Refer
to the "Installer Reference Guide".
Check for possible water leaks.
Adjust system to meet the water flow
requirements.
page 143) or
page 93).
page 143) or
page 93).
106) or hydro PCB A1P
13/05/15 | Version 2.0