Installer reference guide
69
08 + ERLQ004~008
Daikin Altherma - Low Temperature Split
4P313774-1 – 2012.05
12 Troubleshooting
12.3
Solving problems based on symptoms
12.3.1 Symptom: The unit is NOT heating or
cooling as expected
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
Possible causes
Corrective action
The temperature setting is NOT
correct
Check the temperature setting on
the remote controller. Refer to
the operation manual.
The water flow is too low
Check and make sure that:
Q
All shut-off valves of the
water circuit are completely
open.
Q
The water filter is clean.
Clean if necessary.
Q
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 65) or use
the automatic air purge
function (see "9.3.2 To
perform an automatic air
purge" on page 66).
Q
The water pressure is >1
bar.
Q
The expansion vessel is
NOT broken.
Q
The resistance in the water
circuit is NOT too high for
the pump (see "15.11 ESP
curve" on page 99).
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.
The water volume in the
installation is too low
Make sure that the water volume
in the installation is above the
minimum required value (see "To
check the water volume" on
page 24).
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 "6.4.1 About
preparing electrical wiring" on
page 25 and "7.6.4 To connect
the main power supply" on
page 36.
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 65) or use the
automatic air purge function (see
"9.3.2 To perform an automatic
air purge" on page 66).
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
"6.3.3 To check the water
volume" on page 23 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
