Daikin Altherma 3 H HT F Series Installer's Reference Manual page 226

13 | Troubleshooting
Installer reference guide
226
Error code
U7-00 OU: Transmission malfunction between main CPU-
INV CPU
U8-01 Connection with LAN adapter lost
U8-02 Connection with room thermostat lost
U8-03 No connection with room thermostat
U8-04
Unknown USB device
U8-05 File malfunction
U8-07 P1P2 communication error
UA-00 Indoor unit, outdoor unit matching problem
UA-16 Extension/hydro communication problem
UA-17 Tank type problem
UA-21 Extension/hydro mismatch problem
UF-00 Reversed piping or bad communication wiring
detection
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 Reheat only or Schedule + reheat mode 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 Schedule only mode is selected, it is recommended to program an
Eco action 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 rate
25 l/min
INFORMATION
Error AJ-03 is reset automatically from the moment there is a normal tank heat-up.
INFORMATION
If an U8‑04 error occurs, the error can be reset after a successful update of the
software. If the software is not successfully updated then you must make sure that
your USB device has the FAT32 format.
INFORMATION
The user interface of the indoor unit will display how to reset an error code.
Description
EPRA14~18DAV3+W1 + ETVH/X16S18+23DA6V+9W(G)
Daikin Altherma 3 H HT F
4P587502-1 – 2019.07