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Troubleshooting
Installer reference guide
246
Error code
U0-00
OU: Shortage of refrigerant
U1-00
Malfunction by reverse phase/open-phase
U2-00
OU: Defect of power supply voltage
U3-00
Underfloor heating screed dryout function not
completed correctly
U4-00
Indoor/outdoor unit communication problem
U5-00
User interface communication problem
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
U8-11
Connection with the Wireless gateway lost
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.
Description
EBLA09~16D + EDLA09~16D
Daikin Altherma 3 M
4P620241-1B – 2022.05
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