General Symptoms - Daikin EKHBHE008BA3V3 Installation Manual

General symptoms

Symptom 1: The unit is turned on (y LED is lit) but the unit is not
heating or cooling as expected
P
OSSIBLE CAUSES
The temperature setting is not
correct.
The water flow is too low.
The water volume in the installation
is too low.
Symptom 2: The unit is turned on but the compressor is not starting
(space heating or domestic water heating)
P
OSSIBLE CAUSES
The unit must start up out of its
operation range (the water
temperature is too low).
Symptom 3: Pump is making noise (cavitation)
P
OSSIBLE CAUSES
There is air in the system.
Water pressure at pump inlet is too
low.
Symptom 4: The water pressure relief valve opens
P
OSSIBLE CAUSES
The expansion vessel is broken.
The water volume in the installation
is too high.
Installation manual
34
C
ORRECTIVE ACTION
Check the controller set point.
• Check that all shut off valves of the
water circuit are completely open.
• Check if the water filter needs
cleaning.
• Make sure there is no air in the
system (purge air).
• Check on the manometer that there
is sufficient water pressure. The
water pressure must be >1 bar
(water is cold)
• Check that the pump speed setting is
on the highest speed.
• Make sure that the expansion vessel
is not broken.
• Check that the resistance in the
water circuit is not too high for the
pump (refer to "Setting the pump
speed" on page 23).
Make sure that the water volume in
the installation is above the minimum
required value (refer to "Checking
the water volume and expansion
vessel pre-pressure" on page 15).
C
ORRECTIVE ACTION
In case of low water temperature, the
system utilizes the backup heater to
reach the minimum water
temperature first (15°C).
• Check that the backup heater power
supply is correct.
• Check that the backup heater
thermal fuse is closed.
• Check that the backup heater
thermal protector is not activated.
• Check that the backup heater
contactors are not broken.
C
ORRECTIVE ACTION
Purge air.
• Check on the manometer that there
is sufficient water pressure. The
water pressure must be >1 bar
(water is cold).
• Check that the manometer is not
broken.
• Check that the expansion vessel is
not broken.
• Check that the setting of the pre-
pressure of the expansion vessel is
correct (refer to "Setting the pre-
pressure of the expansion vessel" on
page 16).
C
ORRECTIVE ACTION
Replace the expansion vessel.
Make sure that the water volume in
the installation is under the
maximum allowed value (refer to
"Checking the water volume and
expansion vessel pre-pressure" on
page 15).
Symptom 5: The water pressure relief valve leaks
P
OSSIBLE CAUSES
Dirt is blocking the water pressure
relief valve outlet.
Symptom 6: The user interface displays "n
certain buttons
P
OSSIBLE CAUSES
The current permission level is set to
a level that prevents using the
pressed button.
Symptom 7: Space heating capacity shortage at low outdoor
temperatures
P
OSSIBLE CAUSES
Backup heater operation is not
activated.
Symptom 8: Unexpected backup heater operation
P
OSSIBLE CAUSES
Entering water temperature is too
low and leaving water temperature
>25°C.
Too frequent use of the backup
heater during heating operation or
domestic water heating.
C
ORRECTIVE ACTION
Check for correct operation of the
pressure relief valve by turning the
red knob on the valve counter
clockwise:
• If you do not hear a clacking sound,
contact your local dealer.
• In case the water keeps running out
of the unit, close both the water inlet
and outlet shut-off valves first and
then contact your local dealer.
n " when pressing n
n
C
ORRECTIVE ACTION
Change the "user permission level"
field setting [0-00], see "Field
settings" on page 23.
C
ORRECTIVE ACTION
Check that the "backup heater
operation status" field setting [4-00]
is turned on, see "Field settings" on
page 23.
Check whether or not the thermal
protector of the backup heater has
been activated (refer to Main
components, "Backup heater
thermal protector" on page 11
location of the reset button).
Check whether or not the thermal
fuse of the backup heater is blown
(refer to "Main components",
"Backup heater thermal fuse" on
page 11 for location of the reset
button).
C
ORRECTIVE ACTION
Increase the water flow.
The water volume in the cicuit is too
low.
EKHBH/XE008BA
Indoor unit for air to water heat pump system
4PW56301-1A
for