Daikin Altherma 3 R F Installer's Reference Manual page 242

14 | Troubleshooting
Installer reference guide
242
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
12 l/min
INFORMATION
Error AJ-03 is reset automatically from the moment there is a normal tank heat-up.
INFORMATION
The user interface will display how to reset an error code.
Description
ERGA04~08E + EHVZ04+08S18+23E
Daikin Altherma 3 R F
4P629093-1B – 2022.05