Symptom: The Water At The Tap Is Too Cold; Symptom: Heat Pump Failure - Daikin EHFZ-D3V User Reference Manual

7 | Troubleshooting

7.4 Symptom: The water at the tap is too cold

7.5 Symptom: Heat pump failure

User reference guide
52
Possible cause
You ran out of domestic hot water
because of unusually high consumption.
The desired DHW tank temperature is
too low.
When the heat pump fails to operate, the backup heater can serve as an
emergency heater and either automatically or non-automatically take over the
heat load.
▪ When auto emergency is activated and a heat pump failure occurs, the backup
heater will automatically take over the heat load.
▪ When auto emergency is not activated and a heat pump failure occurs, the
domestic hot water and space heating operations will stop and need to be
recovered manually. The user interface will then ask you to confirm whether the
backup heater can take over the heat load or not.
When the heat pump fails, will appear on the user interface.
Corrective action
If you immediately need domestic hot
water, activate the DHW tank booster
mode. However, this consumes extra
energy. See "4.5.6 Using the DHW tank
booster mode" [ 4 33].
If you can wait, overrule (increase) the
active or next scheduled desired
temperature so that more hot water
will be produced exceptionally. See
read out and overrule the active or next
scheduled desired temperature (in
scheduled mode or scheduled + reheat
4
mode)" [ 32].
If the problems recurs daily, do one of
the following:
▪ Increase the DHW tank temperature
preset value. See "4.7.1 Using preset
4
values" [ 40].
▪ Adjust the DHW tank temperature
schedule. Example:
additionally heat up the DHW tank to
a preset value (Storage
lower tank temperature) during the
day. See "4.7.2
programming schedules" [
"4.7.3 Schedules: Example" [
"To
Program to
eco =
Using and
4
41] and
4
43].
EHFZ03S18DJ3V
Daikin Altherma 3 R F
4P596825-1A – 2021.10