Symptom: The Space Is Not Sufficiently Heated At Low Outdoor Temperatures; Symptom: The Pressure At The Tapping Point Is Temporarily Unusually High; Solving Problems Based On Error Codes - Daikin EWYA004D2V3P Installer's Reference Manual

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

15.3.10 Symptom: The pressure at the tapping point is temporarily unusually high

15.4 Solving problems based on error codes

EWAA004~008D + EWYA004~008D
Packaged air-cooled water chillers
and packaged air to water heat pumps
4P688013-1B – 2022.09
Possible causes
If the system contains a backup heater:
The backup heater operation is not
activated
If the system contains a backup heater:
The backup heater equilibrium
temperature has not been configured
correctly
There is air in the system.
Possible causes
Failing or blocked pressure relief valve.
If the unit runs into a problem, the user interface displays an error code. It is
important to understand the problem and to take measures before resetting an
error code. This should be done by a licensed installer or by your local dealer.
This chapter gives you an overview of most possible error codes and their
descriptions as they appear on the user interface.
15 Troubleshooting
|
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
"12 Commissioning" [ 185].
Corrective action
▪ Flush and clean the complete tank
including the piping between pressure
relief valve and the cold water inlet.
▪ Replace the pressure relief valve.
Installer
heater >
Installer reference guide
203