Symptom: The Pressure Relief Valve Opens; Symptom: The Water Pressure Relief Valve Leaks; Symptom: The Space Is Not Sufficiently Heated At Low Outdoor Temperatures; Symptom: The Energy Metering (Produced Heat) Is Not Working Correctly - Daikin EWAQ004BAVP Installer's Reference Manual

12.3.4

Symptom: The pressure relief valve opens

Possible causes
The expansion vessel is broken
The water volume in the
installation is too high
The water circuit head is too high The water circuit head is the
12.3.5 Symptom: The water pressure relief valve
leaks
Possible causes
Dirt is blocking the water
pressure relief valve outlet
12.3.6 Symptom: The space is NOT sufficiently
heated at low outdoor temperatures
Possible causes
If the system contains a backup
heater: backup heater operation
is not activated
EWAQ+EWYQ004+005BAVP
Packaged air-cooled water chillers and packaged air to water heat
pumps
4P492900-1 – 2017.06
Corrective action
Replace the expansion vessel.
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).
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.
Corrective action
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.
Corrective action
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
If the system contains a backup
heater: the backup heater
equilibrium temperature has not
been configured correctly
There is air in the system.
12.3.7 Symptom: The energy metering
(produced heat) is NOT working correctly
Possible causes
The measured temperatures for
produced heat calculation are
NOT accurate.
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
A5 00
E1 00
E3 00
E5 00
E6 00
12 Troubleshooting
Corrective action
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]
Purge air manually or
automatically. See the air purge
function in the "Commissioning"
chapter.
Corrective action
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).
Description
OU: High pressure cooling/Peak
cut/ freeze protection problem.
Please contact your dealer.
OU: PCB defect.
Power reset required.
Please contact your dealer.
OU: Actuation of high pressure
switch (HPS).
Please contact your dealer.
OU: Overheat of inverter
compressor motor.
Please contact your dealer.
OU: Compressor startup defect.
Please contact your dealer.
Installer reference guide
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