Daikin Altherma EHVZ04S18DA6V, Installer'S Reference Manual

Page: 78 / 100

12 Troubleshooting
Installer reference guide
78
ERGA04~08DAV3(A) + 08S18+23DA
Daikin Altherma – Low temperature split
4P495249-1 – 2017.12
Possible causes Corrective action
The preferential kWh rate signal
was sent by the electricity
company Wait for the power to return (2
hours max.).
12.3.3 Symptom: The pump is making noise
(cavitation)
Possible causes Corrective action
There is air in the system Purge air manually on both
zones (see
"To perform a manual
air purge" on page 71 ) or use the
automatic air purge function on
both zones (see
"To perform an
automatic air purge" on page 71 ).
The water pressure at the pump
inlet is too low Check and make sure that:
▪ The water pressure is >1 bar.
▪ The water pressure sensor is
not broken.
▪ The expansion vessel is NOT
broken.
▪ The valve (if equipped) of the
water circuit towards the
expansion vessel is open.
▪ The pre-pressure setting of the
expansion vessel is correct
(see
"6.4.4 Changing the pre-
pressure of the expansion
vessel" on page 22
).
12.3.4 Symptom: The pressure relief valve opens
Possible causes Corrective action
The expansion vessel is broken Replace the expansion vessel.
The valve (if equipped) of the
water circuit towards the
expansion vessel is closed. Open the valve.
The water volume in the
installation is too high Make sure that the water volume
in the installation is below the
maximum allowed value (see
"6.4.3 To check the water volume
and flow rate" on page 21
and
"6.4.4 Changing the pre-pressure
of the expansion vessel" on
page 22
).
The water circuit head is too high 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.
12.3.5 Symptom: The water pressure relief valve
leaks
Possible causes Corrective action
Dirt is blocking the water
pressure relief valve outlet 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.
12.3.6 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:
▪ [9.3.8]: Installer settings >
Backup heater > Operation
[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:
▪ [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
"9 Commissioning" on page 70 .