Daikin ERLA03DAV3 - Symptom: the Space Is NOT Sufficiently Heated at Low Outdoor Temperatures

14 | Troubleshooting
Installer reference guide
181
ERLA03DAV3 + EHFZ03S18DJ3V
Daikin Altherma 3 R F
4P596821-1B – 2021.10
14.3.8 Symptom: The space is NOT sufficiently heated at low outdoor temperatures
Possible causes Corrective action
The backup heater operation is not
activated
Check and make sure that:
▪ The backup heater operation mode is
enabled. Go to:
- [A.5.1.1] > Installer settings
> Heat sources > Backup
heater > Operation mode [4‑00]
▪ The backup heater overcurrent fuse
has not been turned off. If it has,
check the fuse and turn it back on.
▪ The thermal protector of the backup
heater has not been 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:
▪ [A.5.1.4] > Installer settings >
Heat sources > Backup heater >
Equilibrium temp. OR
▪ [A.8] > Installer settings >
Overview settings [5‑01]
There is air in the system. Purge air manually or automatically. See
the air purge function in the
"Commissioning" chapter.
Too much heat pump capacity is used
for heating domestic hot water
Check and make sure that the "space
heating priority" settings have been
configured appropriately:
▪ Make sure that the "space heating
priority status" has been enabled. Go
to [A.8] > Installer settings >
Overview settings [5‑02]
▪ Increase the "space heating priority
temperature" to activate backup
heater operation at a higher outdoor
temperature. Go to [A.8] >
Installer settings > Overview
settings [5‑03]