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8.4
Symptom: The water at the tap is
too cold
Possible cause
You ran out of domestic hot
water because of unusually high
consumption.
The desired DHW tank
temperature is too low.
8.5
Symptom: Heat pump failure
When the heat pump fails to operate, the backup heater can serve
as an emergency heater. It then takes over the heat load either
automatically or by manual interaction.
▪ When Emergency is set to Automatic and a heat pump failure
occurs, the backup heater automatically takes over the domestic
hot water production and space heating.
▪ When Emergency is set to Manual and a heat pump failure
occurs, the domestic hot water heating and space heating stops.
To manually recover it via the user interface, go to the
Malfunctioning main menu screen and confirm whether the
backup heater can take over the heat load or not.
▪ Alternatively, when Emergency is set to:
▪ auto
SH
reduced/DHW
domestic hot water is still available.
▪ auto SH reduced/DHW off, space heating is reduced and
domestic hot water is NOT available.
▪ auto
SH
normal/DHW
normally but domestic hot water is NOT available.
Similarly as in Manual mode, the unit can take the full load with
the
backup
heater
if
the
Malfunctioning main menu screen.
When the heat pump fails,
interface.
Possible cause
Heat pump is damaged.
INFORMATION
When the backup heater takes over the heat load,
electricity consumption will be considerably higher.
EWSAH/X06(U)D
Daikin Altherma 3 WS
4P675761-1C – 2023.02
Corrective action
If you immediately need domestic
hot water, activate the DHW tank
Powerful operation. However,
this consumes extra energy. See
"5.7.4 Using DHW powerful
operation" [ 4 13].
If the problems recurs daily, do
one of the following:
▪ Increase
the
DHW
tank
temperature preset value. See
the user reference guide.
▪ Adjust
the
DHW
tank
temperature
schedule.
Example:
Program
additionally
heat
up
DHW tank to a preset value
(Eco setpoint = lower tank
temperature) during the day.
See
"5.8 Schedule screen:
Example" [ 4 13].
on, space heating is reduced but
off, space heating operates as
user
activates
this
via
or
will appear on the user
Corrective action
See
"8.1 To display the help text
malfunction" [ 4 18].
in case of a
8.6
Symptom: The system is making
gurgling noises after
commissioning
Possible cause
There is air in the system.
Incorrect hydraulic balance.
Various malfunctions.
to
the
(a)
We recommend to purge air with the air purge function of the unit
(to be performed by the installer). If you purge air from the heat
emitters or collectors, mind the following:
WARNING
Air purging heat emitters or collectors. Before you
purge air from heat emitters or collectors, check if
is displayed on the home screen of the user interface.
▪ If not, you can purge air immediately.
▪ If yes, make sure that the room where you want to
purge air is sufficiently ventilated. Reason: Refrigerant
might leak into the water circuit, and subsequently into
the room when you purge air from the heat emitters or
collectors.
9
Disposal
NOTICE
Do NOT try to dismantle the system yourself: dismantling
of the system, treatment of the refrigerant, oil and other
parts MUST comply with applicable legislation. Units
MUST be treated at a specialised treatment facility for
reuse, recycling and recovery.
the
10
Glossary
DHW = Domestic hot water
Hot water used, in any type of building, for domestic
purposes.
LWT = Leaving water temperature
Water temperature at the water outlet of the unit.
9 Disposal
Corrective action
(a)
Purge air from the system.
To be performed by the installer:
1
Perform hydraulic balancing
to assure that the flow is
correctly
distributed
between the emitters.
2
If hydraulic balancing is not
sufficient, change the pump
limitation
settings
([9-0D]
and [9-0E] if applicable).
Check if
or
is displayed
on the home screen of the user
interface. See
"8.1 To display the
help text in case of a
malfunction" [ 4 18] for more
information about the
malfunction.
or
Operation manual
19
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