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Possible causes
The water flow is too low
The water volume in the
installation is too low
15.4.2
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)
15.4.3
Symptom: The pump is making noise
(cavitation)
Possible causes
There is air in the system
EJHA04AAV3 + NHY2KOMB28+32AA
Daikin Altherma H Hybrid
4P556861-1A – 2019.05
Corrective action
Check and make sure that:
▪ All shut-off valves of the water
circuit are completely open.
▪ The water filter is clean. Clean
if necessary.
▪ There is no air in the system.
Purge air if necessary. You
can purge air manually (see
"To perform a manual air
purge" on
page 79) or use the
automatic air purge function
(see
"To perform an automatic
air purge" on
page 80).
▪ The water pressure is >1 bar.
▪ The expansion vessel is NOT
broken.
▪ The resistance in the water
circuit is NOT too high for the
pump (see the ESP curve in
the "Technical data" chapter).
If the problem persists after you
have conducted all of the above
checks, contact your dealer. In
some cases, it is normal that the
unit decides to use a low water
flow.
Make sure that the water volume
in the installation is above the
minimum required value (see
"8.3.4 To check the water volume
and flow rate" on
page 28).
Corrective action
If the water temperature is too
low, the unit uses the gas boiler
to reach the minimum water
temperature first (15°C).
Check and make sure that:
▪ The power supply to the gas
boiler is correctly wired.
▪ The
interconnection
cable
between the gas boiler and the
outdoor
unit
is
properly
connected.
If the problem persists after you
have conducted all of the above
checks, contact your dealer.
Corrective action
Purge air manually (see
"To
perform a manual air purge" on
page 79) or use the automatic air
purge function (see
"To perform
an automatic air purge" on
page 80).
Possible causes
The water pressure at the pump
inlet is too low
15.4.4
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
15.4.5
Symptom: The water pressure relief valve
leaks
Possible causes
Dirt is blocking the water
pressure relief valve outlet
15 Troubleshooting
Corrective action
Check and make sure that:
▪ The water pressure is >1 bar.
▪ The pressure sensor of the
gas boiler is not broken.
▪ The expansion vessel is NOT
broken.
▪ The pre-pressure setting of the
expansion vessel is correct
(see
the
manual
of
the
expansion vessel).
Corrective action
Replace the expansion vessel.
Make sure that the water volume
in the installation is below the
maximum allowed value (see
"8.3.4 To check the water volume
and flow rate" on page 28
and
"8.3.5 Changing the pre-pressure
of the expansion vessel" on
page 29).
difference in height between the
outdoor unit and the highest
point of the water circuit. If the
outdoor unit is located at the
highest point of the installation,
the installation height is
considered 0 m. The maximum
water circuit head is defined by
the expansion vessel (see the
option on boiler or third-party
expansion vessel).
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.
Installer reference guide
87
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