12 Troubleshooting
Installer reference guide
73
EWAQ+005BAVP
Packaged air-cooled water chillers and packaged air to water heat
pumps
4P492900-1 – 2017.06
12.3.4
Symptom: The pressure relief valve opens
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
and flow rate" on page 24
and
"6.3.4 Changing the pre-pressure
of the expansion vessel" on
page 25
).
The water circuit head is too high The water circuit head is the
difference in height between the
outdoor unit and the highest
point of the water circuit. If the
outdoor 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.
12.3.5
Symptom: The water pressure relief valve
leaks
Possible causes
Corrective action
Dirt is blocking the water
pressure relief valve outlet
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.
12.3.6
Symptom: The space is NOT sufficiently
heated at low outdoor temperatures
Possible causes
Corrective action
If the system contains a backup
heater: backup heater operation
is not activated
Check and make sure that:
▪ The backup heater operation
mode is enabled. Go to:
▪ [A.5.1.1] > Installer settings
> Heat sources > Backup
heater > Operation mode
[4‑00]
▪ The backup heater overcurrent
fuse has not been turned off. If
it has, check the fuse and turn
it back on.
▪ The thermal protector of the
backup heater has not been
activated. If it has, check the
following, and then press the
reset button in the switch box:
▪ The water pressure
▪ Whether there is air in the
system
▪ The air purge operation
Possible causes
Corrective action
If the system contains a backup
heater: the backup heater
equilibrium temperature has not
been configured correctly
Increase the "equilibrium
temperature" to activate the
backup heater operation at a
higher outdoor temperature. Go
to:
▪ [A.5.1.4] > Installer settings >
Heat sources > Backup heater
> Equilibrium temp. OR
▪ [A.8] > Installer settings >
Overview settings [5‑01]
There is air in the system.
Purge air manually or
automatically. See the air purge
function in the "Commissioning"
chapter.
12.3.7
Symptom: The energy metering
(produced heat) is NOT working correctly
Possible causes
Corrective action
The measured temperatures for
produced heat calculation are
NOT accurate.
Execute a calibration of the
system by performing an actuator
test run of the pump (see
"9.4.4 To perform an actuator
test run" on page 68
).
12.4
Solving problems based on error
codes
When a problem happens, an error code appears on the user
interface. It is important to understand the problem and to take
countermeasure before resetting the error code. This should be
done by a licensed installer or by your local dealer.
This chapter gives you an overview of all error codes and the
content of the error code as it appears on the user interface.
For a more detailed troubleshooting guideline for each error, please
see the service manual.
12.4.1
Error codes: Overview
Error codes of the outdoor unit
Refrigerant part
Error code
Detailed error
code
Description
A5
00
OU: High pressure cooling/Peak
cut/ freeze protection problem.
Please contact your dealer.
E1
00
OU: PCB defect.
Power reset required.
Please contact your dealer.
E3
00
OU: Actuation of high pressure
switch (HPS).
Please contact your dealer.
E5
00
OU: Overheat of inverter
compressor motor.
Please contact your dealer.
E6
00
OU: Compressor startup defect.
Please contact your dealer.
