Service And Maintenance; Maintenance Activities; Malfunction Codes List; Important Information Regarding The Refrigerant Used - Daikin VRV IV HXY080A8V1B Installation And Operation Manual

8.6.

Service and maintenance

In order to ensure optimal operation of the unit, a number of checks
and inspections on the unit and the field wiring have to be carried out
at regular intervals.
This maintenance should be carried out by your local installer.
To execute maintenance first remove the panels as shown in
"7.4.2. To close the indoor unit" on page
8.6.1.

Maintenance activities

DANGER: ELECTRICAL SHOCK
See "7.3.1. Precautions on electrical wiring work" on
page 14.
WARNING: ELECTRIC SHOCK
Before carrying out any maintenance or repair activity,

always switch off the circuit breaker on the supply
panel, remove the fuses or open the protection
devices of the unit.
Do not touch live parts for 10 minutes after the power

supply is turned off because of high voltage risk.
Please note that some sections of the electric

component box are hot.
Make sure you do not touch a conductive section.

Do not rinse the unit. This may cause electric shocks

or fire.
Play it safe!
Touch a metal part by hand (such as piping sheet metal) in
order to eliminate static electricity and to protect the PCB
before performing service.
Checks
The described checks must be executed at least once a year by
qualified personnel.
1 Pressure relief valve hose (if present)
Check that the pressure relief valve hose is positioned
appropriately to drain the water.
2 Water pressure relief valve
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.
3 Switch box
Carry out a thorough visual inspection of the switch box and look
for obvious defects such as loose connections or defective
wiring.
4 Water pressure
Check if the water pressure is above 1 bar.
If necessary add water.
5 Water filter
Clean the water filter.
HXY080+125A8V1B
VRV IV System indoor unit
4P405267-1B – 2016.02
16.
8.6.2.

Malfunction codes list

Malfunction
code Failure cause
A1
Failure of writing memory
(EEPROM malfunction)
A6
Malfunction water circuit
A9
R410A expansion valve
malfunction.
AA
Heater kit malfunction
AJ
Capacity malfunction.
C1
Bad ACS communication.
C4
R410A liquid thermistor
malfunction.
C9
Returning water thermistor
malfunction.
CA
Heating/cooling leaving
water thermistor malfunction.
CJ
User interface thermostat
thermistor malfunction.
E3
High pressure malfunction.
This malfunction is outdoor
unit related. Refer to outdoor
unit manual.
E4
Low pressure malfunction.
This malfunction is outdoor
unit related. Refer to outdoor
unit manual.
J7
R410A gas thermistor
malfunction.
U1
The phases of the power to
the unit is reversed.
This malfunction is outdoor
unit related. Refer to outdoor
unit manual.
U2
Power supply malfunction.
This malfunction is outdoor
unit related. Refer to outdoor
unit manual.
UA
Type connection problem.
UH
Address malfunction.
A more detailed malfunction code list can be found in the installation
manual of the outdoor unit.
8.6.3.

Important information regarding the refrigerant used

This product contains fluorinated greenhouse gases. Do not vent
gases into the atmosphere.
Refrigerant type: R410A
(1)
GWP value: 2087,5
(1)
GWP = global warming potential
Corrective action
Contact your local dealer.
• Make sure waterflow is
possible (open all valves in
the circuit).
• Force clean water through
the unit.
• Malfunction of pump.
• Malfunction of flowswitch.
• Check wiring connections.
• Contact your local dealer.
• Make sure water flow is
possible.
• Contact your local dealer.
Contact your local dealer.
Contact your local dealer.
• Check wiring connections.
• Contact your local dealer.
• Check wiring connections.
• Contact your local dealer.
• Check wiring connections.
• Contact your local dealer.
Contact your local dealer.
• Make sure the circuit is
filled with water (no air
inside, e.g. is the air purge
open?)
• Make sure water flow is
possible (open all valves in
the circuit).
• Make sure the water filter is
not blocked.
• Make sure all refrigerant
stop valves are open.
• Contact your local dealer.
Contact your local dealer.
• Check wiring connections.
• Contact your local dealer.
Exchange two of the three
phases (L1, L2, L3) to make a
positive phase connection.
• Check wiring connections.
• Contact your local dealer.
• Wait till initialisation
between outdoor module
and hydro module finished
(after power ON, wait at
least 12 minutes).
• Contact your local dealer.
Contact your local dealer.
Installation and operation manual
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