2 | Troubleshooting
Service manual
22
EBLA09~16DA + EDLA09~16DA
Daikin Altherma 3 M
ESIE20-06A – 2021.03
1 Check the water pressure. See "4.3Water circuit"[4299].
Possible cause: Water pressure is too low.
2 Check the water flow. See "4.3Water circuit"[4299].
Possible cause: Water flow is too low.
3 Purge the water circuit. See "4.3Water circuit"[4299].
Possible cause: Air in the water circuit.
4 Check the water circuit for an external heat source. See "4.3 Water
circuit"[4299].
Possible cause: Increased water temperature due to an external heat source.
5 Perform a check of the backup heater thermal protector. See "3.4 Backup
heater thermal protector"[4121].
Possible cause: Faulty backup heater thermal protector.
6 Perform a check of the outlet water after backup heater thermistor. See
"3.20Thermistors"[4248].
Possible cause: Faulty outlet water after backup heater thermistor.
7 Perform a check of the backup heater. See "3.3Backup heater"[4104].
Possible cause: Faulty backup heater.
8 Perform a check of the hydro PCB. See "3.12Hydro PCB"[4160].
Possible cause: Faulty hydro PCB.
INFORMATION
If all procedures listed above have been performed and the problem is still present,
contact the helpdesk.
2.3.17 AA-02 – External backup heater overheated
Trigger Effect Reset
Thermal protector is
activated. Measured
water temperature too
high.
Unit will stop operating. Power reset via outdoor
unit.
To solve the error code
INFORMATION
It is recommended to perform the checks in the listed order.
1 Check the water pressure. See "4.3Water circuit"[4299].
Possible cause: Water pressure is too low.
2 Check the water flow. See "4.3Water circuit"[4299].
Possible cause: Water flow is too low.
3 Purge the water circuit. See "4.3Water circuit"[4299].
Possible cause: Air in the water circuit.
4 Check the water circuit for an external heat source. See "4.3 Water
circuit"[4299].
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