Daikin HXHD125A7V1B, Installation Manual

Page: 47 / 52

HXHD125A7V1B
VRVIII system indoor unit
4PW62584-1A – 11.2010
Installation manual
45
12.3. Draining the system
If draining is needed, connect the drain hose (2) to the drain valve (1)
as described in the figure below and open the drain valve (1).
12.4. General symptoms
Symptom 1: The unit is turned on ( y LED is lit) but the unit is not
heating as expected
Symptom 2: Pump is making noise (cavitation)
Symptom 3: The water pressure relief valve opens
Symptom 4: The water pressure relief valve leaks
Symptom 5: The user interface displays " n n
n n
" when pressing
certain buttons
12.5. Error codes
When a safety device is activated, the user interface LED will be
flashing, and an error code will be displayed.
A list of errors and corrective actions can be found in the table below.
Reset the safety by pushing the y button.
In case this procedure for resetting the safety is not successful,
contact your local dealer.
For other error codes which may be displayed during the system test
run or operation, see the installation manual of the outdoor unit.
P
OSSIBLE CAUSES
C
ORRECTIVE ACTION
The temperature setting is not
correct. Check the controller set point.
The water flow is too low. • 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
>0.3 bar (water is cold), >>0.3 bar
(water is hot).
• Make sure that the expansion
vessel is not broken.
The water volume in the installation
is too low. 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 16
).
Capacity shortage • Check if the cooling fan at the rear
of the switch box is working
properly.
• Check if the unit is not installed in
a too hot location (>30°C).
P
OSSIBLE CAUSES
C
ORRECTIVE ACTION
There is air in the system. Purge air.
Water pressure at pump inlet is too
low. • Check on the manometer that
there is sufficient water pressure.
The water pressure must be
>0.3 bar (water is cold), >>0.3 bar
(water is hot).
• 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 17
).
2
1
P
OSSIBLE CAUSES
C
ORRECTIVE 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 under the
maximum allowed value (refer to
"Checking the water volume and
expansion vessel pre-pressure" on
page 16
).
P
OSSIBLE CAUSES
C
ORRECTIVE ACTION
Dirt is blocking the water pressure
relief valve outlet. 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.
P
OSSIBLE CAUSES
C
ORRECTIVE ACTION
The current permission level is set to
a level that prevents using the
pressed button. Change the "user permission level"
field setting [0-00], see "Field
settings" in the operation manual.
Error
code Failure cause Corrective action
A1
Failure of writing memory
(EEPROM error) Contact your local dealer.
A6
Malfunction of pump in water
circuit (M1P) • Make sure waterflow is
possible (open all valves in the
circuit).
• Force clean water through the
unit.
A9
R410A expansion valve error
(K1E) • Check wiring connections.
• Contact your local dealer.
AE
Water system warning low flow
is expected by the unit. • Check filter.
• Make sure all valves are open.
AJ
Capacity error Contact your local dealer.
C1
Bad ACS communication Contact your local dealer.
C4
R410A liquid thermistor error
(R3T) • Check wiring connections.
• Contact your local dealer.
C5
Domestic hot water tank
thermistor error (R2T) • Check wiring connections.
• Check if the domestic hot
water option is turned active
(refer to field setting [6-00]).
• Contact your local dealer.
C9
Returning water thermistor error
(R4T) • Check wiring connections.
• Contact your local dealer.
CA
Heating leaving water thermistor
error (R5T) • Check wiring connections.
• Contact your local dealer.
CJ
Remote controller thermostat
thermistor error Contact your local dealer.
E1
Compressor PCB error Contact your local dealer.