7 Troubleshooting
Operation manual
19
ET9W
Daikin Altherma 3 H MT F
4P634884-1 – 2021.03
7.3
Symptom: You are feeling too cold
(hot) in your living room
Possible cause
Corrective action
The desired room temperature is
too low (high).
Increase (decrease) the desired
room temperature. See
change the desired room
temperature"
If the problem recurs daily, do
one of the following:
▪ Increase (decrease) the room
temperature preset value. See
the user reference guide.
▪ Adjust the room temperature
schedule. See
14].
The desired room temperature
cannot be reached.
Increase the desired leaving
water temperature in accordance
with the heat emitter type. See
"4.6.3 To change the desired
leaving water temperature"
12].
The weather-dependent curve is
set incorrectly.
Adjust the weather-dependent
curve. See
7.4
Symptom: The water at the tap is
too cold
Possible cause
Corrective action
You ran out of domestic hot
water because of unusual high
consumption.
If you immediately need domestic
hot water, activate the DHW tank
Powerful operation
. However,
this consumes extra energy. See
"4.7.4 Using DHW powerful
operation"
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
to
additionally
heat
up
the
DHW tank to a preset value
(
Eco setpoint
= lower tank
temperature) during the day.
See
The desired DHW tank
temperature is too low.
7.5
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 on
, space heating is reduced but
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 off
, space heating operates as
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 user activates this via the
Malfunctioning
main menu screen.
When the heat pump fails,
or
will appear on the user
interface.
Possible cause
Corrective action
Heat pump is damaged.
18].
INFORMATION
When the backup heater takes over the heat load,
electricity consumption will be considerably higher.
7.6
Symptom: The system is making
gurgling noises after
commissioning
Possible cause
Corrective action
There is air in the system.
Purge air from the system.
(a)
Incorrect hydraulic balance.
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).
Various malfunctions.
Check if
or
is displayed
on the home screen of the user
interface. See
help text in case of a
malfunction"
18] for more
information about the
malfunction.
(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
or
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.
