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8
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Troubleshooting
8.5 Symptom: The water at the tap is too cold
8.6 Symptom: Heat pump failure
User reference guide
50
Possible cause
The desired room temperature cannot
be reached.
The weather-dependent curve is set
incorrectly.
Possible cause
You ran out of domestic hot water
because of unusual high consumption.
The desired DHW tank temperature is
too low.
When the heat pump fails to operate, the gas boiler can serve as an emergency
back-up heater and either automatically or non-automatically take over the entire
heat load.
▪
When auto emergency is activated and a heat pump failure occurs, the boiler
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
boiler can take over the entire heat load or not.
When the heat pump fails, will appear on the user interface.
Corrective action
Increase the desired leaving water
temperature in accordance with the
heat emitter type. See
thermostat control - Using the leaving
water temperature home
Adjust the weather-dependent curve.
See
"4.8 Weather dependent
4
operation" [
38].
Corrective action
If you immediately need domestic hot
water, activate the DHW tank booster
mode. However, this consumes extra
energy.
If you can wait, overrule (increase) the
active or next scheduled desired
temperature so that more hot water
will be produced exceptionally.
If the problems recurs daily, do one of
the following:
▪
Increase the DHW tank temperature
preset value.
▪
Adjust the DHW tank temperature
schedule.
Example:
additionally heat up the DHW tank to
a preset value (Storage
lower tank temperature) during the
day.
CHYHBH05+08AF + EHYKOMB33AA
"4.4.4 Room
4
pages" [
20].
Program
to
eco =
Daikin Altherma R Hybrid
4P471762-1B – 2020.10
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