Daikin Altherma 3 H F+W - Symptom: the Water at the Tap Is too Cold; Symptom: Heat Pump Failure

7 | Troubleshooting
User reference guide
53
EABH/X16DF6V(7)+9W(7) + EAVH/X16S(U)18+23DA6V(7)+9W(7)
Daikin Altherma 3 H F+W
4P556071-1C – 2021.09
Possible cause Corrective action
The desired room temperature cannot
be reached.
Increase the desired leaving water
temperature in accordance with the
heat emitter type. See "4.4.5To change
the desired leaving water
temperature"[422].
The weather-dependent curve is set
incorrectly.
Adjust the weather-dependent curve.
See "4.8Weather-dependent
curve"[440].
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
"4.5.6Using DHW powerful
operation"[426].
If the problems recurs daily, do one of
the following:
▪ Increase the DHW tank temperature
preset value. See "4.7.1 Using preset
values"[430].
▪ 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 "4.7.3 Using and
programming schedules" [4 33] and
"4.7.4 Schedule screen:
Example"[436].
The desired DHWtank temperature is
too low.
7.5 Symptom: Heat pump failure
When the heat pump fails to operate, the backup heater and/or booster heater
can serve as an emergency heater and either automatically or non-automatically
take over the heat load.
▪ When auto emergency is set to Automatic and a heat pump failure occurs:
- For EHVH/X: The backup heater will automatically take over the heat load and
domestic hot water production
- For EHBH/X: The backup heater will automatically take over the heat load, and
the booster heater in the optional tank will automatically take over the
domestic hot water production.
▪ When auto emergency is set to Manual and a heat pump failure occurs, the
domestic hot water and space heating operation will stop and need to be
recovered manually via the user interface. To recover operation manually, go to