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Possible causes
The water flow is too low
The water volume in the
installation is too low
12.2.2
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
ERLQ004~008CAV3 + EHVH/X04+08S18CA + EHVH/X08S26CA
Daikin Altherma - Low Temperature Split
4P313775-1C – 2012.11
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
"9.3.1 To perform a manual air
purge" on page 66) or use the
automatic air purge function
(see "9.3.2 To perform an
automatic
air
purge"
on
page 67).
▪ 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 "15.11 ESP curve"
on page 105).
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
"6.3.3 To check the water
volume" on page 23).
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.
This should match with the
connections as explained in
"6.4.1 About preparing electrical
wiring" on page 24 and "7.6.4 To
connect the main power supply"
on page 36.
Wait for the power to return (2
hours max.).
12.2.3
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
12.2.4
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
12.2.5
Symptom: The water pressure relief valve
leaks
Possible causes
Dirt is blocking the water
pressure relief valve outlet
12 Troubleshooting
Corrective action
Purge air manually (see
"9.3.1 To perform a manual air
purge" on page 66) or use the
automatic air purge function (see
"9.3.2 To perform an automatic
air purge" on page 67).
Check and make sure that:
▪ The water pressure is >1 bar.
▪ The manometer is not broken.
▪ The expansion vessel is not
broken.
▪ The pre-pressure setting of the
expansion vessel is correct
(see "6.3.4 Changing the pre-
pressure of the expansion
vessel" on page 24).
Corrective action
Replace the expansion vessel.
Make sure that the water volume
in the installation is below the
maximum allowed value (see
"6.3.3 To check the water
volume" on page 23 and
"6.3.4 Changing the pre-pressure
of the expansion vessel" on
page 24).
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.
Installer reference guide
71
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