Symptom: The Pressure At The Tapping Point Is Temporarily Unusually High; Symptom: Decoration Panels Are Pushed Away Due To A Swollen Tank; Symptom: Tank Disinfection Function Is Not Completed Correctly (Ah-Error); Solving Problems Based On Error Codes - Daikin ERGA08DAV3 Installer's Reference Manual

Possible causes
The backup heater equilibrium
temperature has not been
configured correctly
There is air in the system.
Too much heat pump capacity is
used for heating domestic hot
water
12.3.8 Symptom: The pressure at the tapping
point is temporarily unusually high
Possible causes
Failing or blocked pressure relief
valve.
12.3.9 Symptom: Decoration panels are pushed
away due to a swollen tank
Possible causes
Failing or blocked pressure relief
valve.
12.3.10 Symptom: Tank disinfection function is
NOT completed correctly (AH-error)
Possible causes
The disinfection function was
interrupted by domestic hot water
tapping
ERGA04~08DAV3(A) + EHVZ04+08S18+23DA +
EHVZ04+08S18+23DJ
Daikin Altherma 3 R F
4P495249-1B – 2019.06
Corrective action
Increase the equilibrium
temperature to activate the
backup heater operation at a
higher outdoor temperature. Go
to:
▪ [9.3.7]: Installer settings
> Backup heater
Equilibrium temperature
[5‑01]
Purge air manually or
automatically. See the air purge
function in the chapter
"9 Commissioning" on page 72.
Check and make sure that the
Space heating priority
settings have been configured
appropriately:
▪ Make sure that the Space
heating priority has been
enabled. Go to [9.6.1]:
Installer settings
Balancing > Space heating
priority [5‑02]
▪ Increase the "space heating
priority temperature" to
activate backup heater
operation at a higher outdoor
temperature. Go to [9.6.3]:
Installer settings
Balancing > Offset BSH
setpoint [5‑03]
Corrective action
▪ Flush and clean the complete
tank including the piping
between pressure relief valve
and the cold water inlet.
▪ Replace the pressure relief
valve.
Corrective action
Contact your local dealer.
Corrective action
Program the start-up of the
disinfection function when the
coming 4 hours NO domestic hot
water tapping is expected.
Possible causes
Large domestic hot water tapping
happened recently before the
programmed start-up of the
disinfection function
>
The disinfection operation was
stopped manually: [C.3]
Operation > Tank was turned off
during disinfection.
>
12.4 Solving problems based on error
codes
If the unit runs into a problem, the user interface displays an error
code. It is important to understand the problem and to take
measures before resetting an error code. This should be done by a
licensed installer or by your local dealer.
>
This chapter gives you an overview of all possible error codes and
their descriptions as they appear on the user interface.
For detailed troubleshooting of each error, see the service manual.
12.4.1 To display the help text in case of a
malfunction
In case of a malfunction, the following will appear on the home
screen depending on the severity:
▪ : Error
▪ : Malfunction
You can get a short and a long description of the malfunction as
follows:
1 Press the left dial to open the main menu and go to
Malfunctioning.
Result: A short description of the error and the error
code is displayed on the screen.
2 Press in the error screen.
Result: A long description of the error is displayed
on the screen.
12.4.2

Error codes: Overview

Error codes of the outdoor unit
Error code Detailed error
code
A1 00
A5 00
E1 00
12 Troubleshooting
Corrective action
When Tank > Heat up mode >
Reheat only or Schedule +
reheat is selected, it is
recommended to program the
start-up 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 Tank > Heat up mode >
Schedule only is selected, it is
recommended to program a Eco
action 3 hours before the
scheduled start-up of the
disinfection function to preheat
the tank.
Do NOT stop tank operation
during disinfection.
Description
Zero cross detection
problem
OU: High pressure peak
cut / freeze protection
problem
OU: PCB defect
Installer reference guide
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