Daikin EKHWET120B V3 Series, User Reference Manual

Page: 44 / 52

8 | Troubleshooting
User reference guide
44
E120B
R32 Split series – Domestic hot water tank
4P680076-1A – 2022.11
8.3 Symptom: The water at the tap is too cold
Possible cause Corrective action
You ran out of domestic hot water
because of unusually high consumption. If you immediately need domestic hot
water, activate the DHW tank
Powerful operation . However, this
consumes extra energy. See
"5.6.6 Using DHW powerful
operation"
[
4
24].
If the problems recurs daily, do one of
the following:
▪ Increase the DHW tank temperature
preset value. See
"5.7.1 Using preset
values" [
4
25].
▪ 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 "5.7.2 Using and
programming schedules" [ 4 25] and
"5.7.3 Schedule screen:
Example" [ 4 27].
The desired DHW tank temperature is
too low.
8.4 Symptom: Heat pump failure
When the heat pump fails to operate, the booster 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
booster heater in the tank automatically takes over the domestic hot water
production.
▪ When Emergency is set to Manual and a heat pump failure occurs, the
domestic hot water heating stops.
To manually recover it via the user interface, go to the Malfunctioning main
menu screen and confirm whether the booster heater can take over the heat
load or not.
When the heat pump fails, or will appear on the user interface.
Possible cause Corrective action
Heat pump is damaged. See "8.1 To display the help text in case
of a malfunction" [
4
43].
INFORMATION
When the booster heater takes over the heat load, electricity consumption will be
considerably higher.