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12 Troubleshooting
Installer reference guide
72
EWAQ+005BAVP
Packaged air-cooled water chillers and packaged air to water heat
pumps
4P492900-1 – 2017.06
Possible causes Corrective action
The water flow is too low 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 67
) or use the
automatic air purge function
(see
"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 the ESP curve in
the "Technical data" chapter).
▪ The pump is NOT blocked. To
check this, perform a pump
test (see
"9.4.4 To perform an
actuator test run" on page 68 ).
If it is blocked, the pump will
perform a deblocking routine
during this test. During the
deblocking routine, the LED on
the pump will blink red. From
the moment the pump is
deblocked, the LED will stay
green. If the pump cannot be
deblocked in 30 minutes, error
7H-05 will appear on the user
interface. If this is the case,
the pump needs to be checked
and possibly replaced.
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
"6.3.3 To check the water volume
and flow rate" on page 24
).
INFORMATION
If an error occurs during the deblocking routine, the
deblocking routine will stop and error 7H‑05 will appear on
the user interface (NOT the error that caused the
deblocking routine to stop). To make this error appear, first
accept the 7H‑05 error.
12.3.2 Symptom: The compressor does NOT
start
Possible causes Corrective action
The unit must start up out of its
operation range (the water
temperature is too low) If the system contains a
backup heater:
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 system does NOT
contain a backup heater
:
It may be required to start up with
a small water volume. To do this,
gradually open the heat emitters.
As a result, the water
temperature will gradually rise.
Monitor the inlet water
temperature ([6.1.6] in the menu
structure) and make sure it does
NOT drop below 15°C.
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 This should match with the
connections as explained in
"6.4 Preparing electrical
wiring" on page 26
and "7.8.5 To
connect the main power
supply" on page 38
.
The preferential kWh rate signal
was sent by the electricity
company Wait for the power to return (2
hours max.).
12.3.3 Symptom: The pump is making noise
(cavitation)
Possible causes Corrective action
There is air in the system Purge air manually (see "To
perform a manual air purge" on
page 67
) or use the automatic air
purge function (see "To perform
an automatic air purge" on
page 67
).
The water pressure at the pump
inlet is too low 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 25
).