Daikin Altherma 3 R F - Symptom: the Space Is NOT Sufficiently Heated at Low Outdoor Temperatures

15 | Troubleshooting
Installer reference guide
270
ERLA11~16D + EBVH16SU23D
Daikin Altherma 3 R F
4P655196-1A – 2022.05
15.3.9 Symptom: The space is NOT sufficiently heated at low outdoor temperatures
Possible causes Corrective action
The backup heater operation is not
activated
Check the following:
▪ The backup heater operation mode is
enabled.
Go to: [9.3.8]: Installer
settings > Backup heater >
Operation [4‑00]
▪ The backup heater overcurrent circuit
breaker is on. If not, turn it back on.
▪ The thermal protector of the backup
heater is NOT activated. If it has,
check the following, and then press
the reset button in the switch box:
- The water pressure
- Whether there is air in the system
- The air purge operation
The backup heater equilibrium
temperature has not been configured
correctly
Increase the equilibrium temperature to
activate the backup heater operation at
a higher outdoor temperature.
Go to: [9.3.7]: Installer settings
> Backup heater > Equilibrium
temperature [5‑01]
There is air in the system. Purge air manually or automatically. See
the air purge function in the chapter
"12Commissioning"[4245].
Too much heat pump capacity is used
for heating domestic hot water
Check if the Space heating
priority settings have been
configured appropriately:
▪ Make sure that the Space heating
priority has been enabled.
Go to [9.6.1]: Installer
settings > Balancing > Space
heating priority [5‑02]
▪ Increase the "space heating priority
temperature" to activate backup
heater operation at a higher outdoor
temperature.
Go to [9.6.3]: Installer
settings > Balancing >
Priority temperature [5‑03]