Daikin Altherma EBLQ011CA3V3 - Booster Heater Overheating; AH-00 - Legionella Operation Failed; Domestic Hot Water Long Heat-Up Abnormality

1 Troubleshooting
Service manual
10
EBLQ+EDLQ011~016CAV3+W1 + EBLQ+EDLQ011~016CA3V3+W1
+ EK(2)CB07CAV3 + EKMBUHCA3V3+9W1
Daikin Altherma – Monobloc
ESIE18-04 – 2019.02
4 Check the water circuit for an external heat source. See
"3.3Water circuit"on page95.
Possible cause: Increased water temperature due to an
external heat source.
5 Perform a check of the backup heater thermal protector. See
"2.5Backup heater thermal protector"on page48.
Possible cause: Faulty backup heater thermal protector.
6 Perform a check of the outlet water after backup heater
thermistor. See "2.23Thermistors"on page82.
Possible cause: Faulty outlet water after backup heater
thermistor.
7 Perform a check of the backup heater. See "2.4 Backup
heater"on page41.
Possible cause: Faulty backup heater.
8 Perform a check of the hydro PCB. See "2.14 Hydro PCB"on
page58.
Possible cause: Faulty hydro PCB.
INFORMATION
If all procedures listed above have been performed and the
problem is still present, contact the helpdesk.
1.4.19 AC-00 – Booster heater overheating
Trigger Effect Reset
Thermal protector is
activated. Measured
water temperature
>85°C.
Unit will NOT stop
operating.
Manual reset of the
thermal protector.
Manual reset via user
interface.
To solve the error code
INFORMATION
It is recommended to perform the checks in the listed
order.
1 Check the water flow. See "3.3Water circuit"on page95.
Possible cause: Water flow is too low.
2 Perform a check of the air purge valves. See "3.3 Water
circuit"on page95.
Possible cause: Air in the water circuit.
3 Check the water circuit for an external heat source. See
"3.3Water circuit"on page95.
Possible cause: Increased water temperature due to an
external heat source.
4 Check the domestic hot water tank and booster heater related
settings. See "2.24User interface"on page87.
Possible cause: Faulty booster heater settings.
5 Perform a check of the booster heater thermal protector. See
"2.7Booster heater thermal protector"on page50.
Possible cause: Faulty booster heater thermal protector.
6 Perform a check of the booster heater. See "2.6 Booster
heater"on page49.
Possible cause: Faulty booster heater.
7 Perform a check of the hydro PCB. See "2.14 Hydro PCB"on
page58.
Possible cause: Faulty hydro PCB.
8 Perform a check of the power supply, connections, wiring,…
between the outdoor unit, indoor unit and domestic hot water
tank. See "3.1Power supply"on page91.
Possible cause: Faulty wiring between the outdoor unit,
indoor unit and domestic hot water tank.
INFORMATION
If all procedures listed above have been performed and the
problem is still present, contact the helpdesk.
1.4.20 AH-00 – Legionella operation failed
Trigger Effect Reset
Disinfection setpoint
is NOT reached
within 6hours or NOT
kept for the required
time.
Unit will NOT stop
operating.
Automatic reset when
disinfection is
completed.
To solve the error code
INFORMATION
It is recommended to perform the checks in the listed
order.
1 Check when the disinfection is scheduled. Schedule it when
there is little chance that water will be tapped so that the
disinfection can finish in time.
Possible cause: Large quantity of hot water has been tapped
during/before disinfection.
2 Check the backup heater settings [2‑00] to [2‑04] and [4‑00].
See "2.24User interface"on page87.
Possible causes:
▪ Backup heater is restricted during disinfection,
▪ Backup heater NOT allowed.
3 Check the domestic hot water tank and booster heater related
settings. See "2.24User interface"on page87.
Possible cause: Faulty booster heater settings.
INFORMATION
If all procedures listed above have been performed and the
problem is still present, contact the helpdesk.
1.4.21 AJ-03 – Domestic hot water long heat-up
abnormality
Trigger Effect Reset
Domestic hot water
heat‑up time
>6hours.
Unit will switch to
space heating/cooling
for 3hours.
Automatic reset after
a domestic hot water
heat‑up time
<6hours.
To solve the error code
INFORMATION
It is recommended to perform the checks in the listed
order.
1 Perform a check of the backup heater. See "2.4 Backup
heater"on page41.
Possible cause: Faulty backup heater.
2 Check if the power supply is conform with the regulations. See
"3.1Power supply"on page91.
Possible cause:
▪ Faulty or disturbance of the power supply (imbalance
>10%),
▪ Power drop,
▪ Short circuit.
3 Perform a check of the hydro PCB. See "2.14 Hydro PCB"on
page58.