EHVH/X16
Daikin Altherma - Low Temperature Split
4P313777-1 – 2012.05
Installer reference guide
58
12 Troubleshooting
12.3.2 Symptom: The compressor does NOT start
(space heating or domestic water heating)
12.3.3 Symptom: The pump is making noise
(cavitation)
12.3.4 Symptom: The pressure relief valve opens
12.3.5 Symptom: The water pressure relief valve
leaks
12.3.6 Symptom: The space is NOT sufficiently
heated at low outdoor temperatures
Possible causes
Corrective action
The unit must start up out of its
operation range (the water
temperature is too low)
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:
Q
The power supply to the
backup heater is correctly
wired.
Q
The backup heater thermal
protector is NOT activated.
Q
The backup heater
contactors are NOT broken.
If the problem persists after you
have conducted all of the above
checks, contact your dealer.
The preferential kWh rate power
supply settings and electrical
connections do NOT match
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.
The preferential kWh rate signal
was sent by the electricity
company
Wait for the power to return (2
hours max.).
Possible causes
Corrective action
There is air in the system
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).
The water pressure at the pump
inlet is too low
Check and make sure that:
Q
The water pressure is >1
bar.
Q
The manometer is not
broken.
Q
The expansion vessel is not
broken.
Q
The pre-pressure setting of
the expansion vessel is
correct (see To set the pre-
pressure of the expansion
vessel).
Possible causes
Corrective action
The expansion vessel is broken
Replace the expansion vessel.
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
"6.2.3 To check the water
volume" on page 19 and To set
the pre-pressure of the
expansion vessel).
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.
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:
Q
If you do NOT hear a
clacking sound, contact your
dealer.
Q
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.
Possible causes
Corrective action
The backup heater operation is
not activated
Check and make sure that:
Q
The backup heater
operation mode is enabled.
Go to:
Q
[A.5.1.1] > Installer
settings > Heat sources
> Backup heater >
Operation mode OR
Q
[A.8] > Installer settings
> Overview settings [5-
01]
Q
The thermal protector of the
backup heater has not been
activated. If it has, check:
Q
The water pressure
Q
Whether there is air in
the system
Q
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.
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