Symptom: The Pressure Relief Valve Opens; Symptom: The Water Pressure Relief Valve Leaks; Symptom: The Space Is Not Sufficiently Heated At Low Outdoor Temperatures - Daikin EPRA10EAV3 Installer's Reference Manual

14.3.7 Symptom: The pressure relief valve opens

14.3.8 Symptom: The water pressure relief valve leaks

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

EPRA08~12EAV3+W1 + ETSH/X(B)12P30+50EF
Daikin Altherma 3 H MT ECH₂O
4P663478-1B – 2022.07
Possible causes
The valve (if equipped) of the water
circuit towards the expansion vessel is
closed.
The water circuit head is too high
Possible causes
Dirt is blocking the water pressure relief
valve outlet
Possible causes
The backup heater operation is not
activated
14 Troubleshooting
|
Corrective action
Open the valve.
The water circuit head is the difference
in height between the indoor unit and
the highest point of the water circuit. If
the indoor unit is located at the highest
point of the installation, the installation
height is considered 0 m. The maximum
water circuit head is 10 m.
Check the installation requirements.
Corrective action
Check whether the pressure relief valve
works correctly by turning the red knob
on the valve counterclockwise:
▪ If you do NOT hear a clacking sound,
contact your dealer.
▪ If the water keeps running out of the
unit, close both the water inlet and
outlet shut-off valves first and then
contact your dealer.
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
Installer
heater >
Installer reference guide
255