EHBH/X16
Daikin Altherma - Low Temperature Split
4P313776-1 – 2012.05
Installer reference guide
58
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)
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 59) or use
the automatic air purge
function (see "9.3.2 To
perform an automatic air
purge" on page 60).
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 "14.8 ESP
curve" on page 82).
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 20).
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 21 and "7.4.3 To connect
the main power supply" on
page 26.
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 59) or use the
automatic air purge function (see
"9.3.2 To perform an automatic
air purge" on page 60).
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).
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