Solving Problems Based On Symptoms - Daikin ERGA04DAV3A Installer's Reference Manual

12 Troubleshooting
WARNING
Prevent hazards due to inadvertent resetting of the thermal
cut-out: this appliance MUST NOT be supplied through an
external switching device, such as a timer, or connected to
a circuit that is regularly turned ON and OFF by the utility.
DANGER: RISK OF BURNING
12.3 Solving problems based on
symptoms
12.3.1 Symptom: The unit is NOT heating or
cooling as expected
Possible causes
The temperature setting is NOT
correct
The water flow is too low
The water volume in the
installation is too low
Installer reference guide
84
Corrective action
Check the temperature setting on
the remote controller. Refer to
the operation manual.
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 78) or use the
automatic air purge function
(see "To perform an automatic
air purge" on page 78).
▪ The water pressure is >1 bar.
▪ The expansion vessel is NOT
broken.
▪ The valve (if equipped) of the
water circuit towards
expansion vessel is open.
▪ 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
"6.4.3 To check the water volume
and flow rate" on page 26).
Final English - Tanslations in progress
12.3.2 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
12.3.3 Symptom: The pump is making noise
(cavitation)
Possible causes
There is air in the system
the
The water pressure at the pump
inlet is too low
12.3.4 Symptom: The pressure relief valve opens
Possible causes
The expansion vessel is broken
The valve (if equipped) of the
water circuit towards the
expansion vessel is closed.
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
backup heater is
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
"6.5 Preparing electrical
wiring" on page 28 and
connect the main power
supply" on page 43.
Wait for the power to return (2
hours max.).
Corrective action
Purge air manually (see
perform a manual air purge" on
page 78) or use the automatic air
purge function (see "To perform
an automatic air purge" on
page 78).
Check and make sure that:
▪ The water pressure is >1 bar.
▪ The water pressure sensor is
not broken.
▪ The expansion vessel is NOT
broken.
▪ The valve (if equipped) of the
water circuit towards
expansion vessel is open.
▪ The pre-pressure setting of the
expansion vessel is correct
(see "6.4.4 Changing the pre-
pressure of the expansion
vessel" on page 27).
Corrective action
Replace the expansion vessel.
Open the valve.
ERGA04~08DAV3(A) + EHVH/X04+08S18+23DA
Daikin Altherma – Low temperature split
4P495248-1 – 2017.12
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