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12.3.2 Symptom: The compressor does NOT start
(space heating or domestic water heating)
Possible causes
The unit must start up out of its
operation range (the water
temperature is too low)
The preferential kWh rate power
supply settings and electrical
connections do NOT match
The preferential kWh rate signal
was sent by the electricity
company
12.3.3 Symptom: The pump is making noise
(cavitation)
Possible causes
There is air in the system
The water pressure at the pump
inlet is too low
EHVH/X16
Daikin Altherma - Low Temperature Split
4P313777-1 – 2012.05
Corrective action
If the water temperature is too
low, the unit uses the backup
heater to reach the minimum
water temperature first (15°C).
Check and make sure that:
The power supply to the
backup heater is correctly
wired.
The backup heater thermal
protector is NOT activated.
The
backup
heater
contactors are NOT broken.
If the problem persists after you
have conducted all of the above
checks, contact your dealer.
For setting the preferential kWh
rate power supply, see To
connect to a preferential kWh
rate power supply. This should
match with the connections as
explained in "6.3.1 About
preparing electrical wiring" on
page 20 and "7.4.3 To connect
the main power supply" on
page 25.
Wait for the power to return (2
hours max.).
Corrective action
Purge air manually (see
"9.3.1 To perform a manual air
purge" on page 53) or use the
automatic air purge function (see
"9.3.2 To perform an automatic
air purge" on page 54).
Check and make sure that:
The water pressure is >1
bar.
The
manometer
is
broken.
The expansion vessel is not
broken.
The pre-pressure setting of
the expansion vessel is
correct (see To set the pre-
pressure of the expansion
vessel).
12.3.4 Symptom: The pressure relief valve opens
Possible causes
The expansion vessel is broken
The water volume in the
installation is too high
The water circuit head is too high The water circuit head is the
12.3.5 Symptom: The water pressure relief valve
leaks
Possible causes
Dirt is blocking the water
pressure relief valve outlet
12.3.6 Symptom: The space is NOT sufficiently
heated at low outdoor temperatures
Possible causes
The backup heater operation is
not activated
not
12 Troubleshooting
Corrective action
Replace the expansion vessel.
Make sure that the water volume
in the installation is below the
maximum allowed value (see
"6.2.3 To check the water
volume" on page 19 and To set
the pre-pressure of the
expansion vessel).
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 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 OR
[A.8] > Installer settings
> Overview settings [5-
01]
The thermal protector of the
backup heater has not been
activated. If it has, check:
The water pressure
Whether there is air in
the system
The air purge operation
Press the reset button in the
switch box. See
"14.2 Components" on page 63
for the location of the reset
button.
Installer reference guide
58
>
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