Symptom: The Space Is Not Sufficiently Heated At Low Outdoor Temperatures - Daikin EPRA18DAW1 Installer's Reference Manual

13 | Troubleshooting

13.3.9 Symptom: The space is NOT sufficiently heated at low outdoor temperatures

Installer reference guide
214
Possible causes
The backup heater operation is not
activated
The backup heater equilibrium
temperature has not been configured
correctly
There is air in the system.
Too much heat pump capacity is used
for heating domestic hot water
Corrective action
Check the following:
▪ The backup heater operation mode is
enabled.
Go to: [9.3.8]:
settings > Backup
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
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]
Purge air manually or automatically. See
the air purge function in the chapter
4
"10 Commissioning" [ 189].
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]:
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]:
>
settings Balancing
Priority temperature [5‑03]
EPRA14~18DAV3+W1 + ETVZ16S18+23DA6V+9W
Installer
heater >
Installer
Installer
>
Daikin Altherma 3 H HT F
4P587503-1A – 2020.01