Daikin Altherma 08CA Installer's Reference Manual page 99

Error code Detailed error
code
U5 00
U6 36
U8 01
UA 00
UA 52
INFORMATION
In case of error code AH and no interruption of the
disinfection function occurred due to domestic hot water
tapping, following actions are recommended:
▪ When the Domestic hot water > Type > Reheat or
Reheat + sched. is selected, it is recommended to
program the start-up of the disinfection function at least
4 hours later than the last expected large hot water
tapping. This start-up can be set by installer settings
(disinfection function).
▪ When the Domestic hot water > Type > Scheduled only
is selected, it is recommended to program a Storage
eco 3 hours before the scheduled start-up of the
disinfection function to preheat the tank.
NOTICE
When the minimum water flow is lower than described in
the table below, the unit will temporarily stop operation and
the user interface will display error 7H‑01. After some time,
this error will reset automatically and the unit will resume
operation.
Minimum required flow during heat pump operation
05 models
08 models Heating
Cooling
Minimum required flow during defrost operation
05 models
08 models
If the 7H‑01 error persists, the unit will stop operation and the user
interface will display an error code that needs to be reset manually.
Depending on the problem, this error code is different:
Error code Detailed error
code
7H 04
EVLQ05+08CAV3 + EHYHBH05AA + EHYHBH/X08AA +
EHYKOMB33AA
Daikin Altherma hybrid heat pump
4P355634-1C – 2018.06
Description
User interface
communication problem.
Boiler standby abnormality
Check boiler
Refer to boiler manual
Connection with adapter lost
Please contact your dealer.
Indoor unit, outdoor unit
matching problem.
Power reset required.
Boiler, indoor unit matching
problem.
Please contact your dealer.
7 l/min
8 l/min
8 l/min
7 l/min
8 l/min
Description
The water flow problems mainly
occurred during domestic hot
water operation. Check the
domestic hot water circuit.
Error code Detailed error
code
7H 05
7H 06
INFORMATION
Error AJ-03 is reset automatically from the moment there is
a normal tank heat-up.
INFORMATION
Error EC-04 is reset automatically from the moment the
domestic hot water tank is preheated to a sufficiently high
temperature.
INFORMATION
If a U6‑36 error occurs, press the gas boiler's On/off
button.
Error codes of the outdoor unit
Error code Detailed error
code
A5 00
E1 00
E3 00
E5 00
E6 00
E7 00
E8 00
EA 00
13 Troubleshooting
Description
The water flow problems mainly
occurred during space heating
operation. Check the space
heating circuit.
The water flow problems mainly
occurred during cooling/defrost
operation. Check the space
heating/cooling circuit.
Additionally, this error code might
be an indication of frost damage
to the plate heat exchanger. In
that case, contact your local
dealer.
Description
OU: High pressure cooling/Peak
cut/ freeze protection problem.
Please contact your dealer.
OU: PCB defect.
Power reset required.
Please contact your dealer.
OU: Actuation of high pressure
switch (HPS).
Please contact your dealer.
OU: Overheat of inverter
compressor motor.
Please contact your dealer.
OU: Compressor startup defect.
Please contact your dealer.
OU: Malfunction of outdoor
unit fan motor.
Please contact your dealer.
OU: Power input overvoltage.
Please contact your dealer.
OU: Cool/heat switchover
problem.
Please contact your dealer.
Installer reference guide
99