Daikin ERSQ 011AAV1 Service Manual page 130

Symptom-based Troubleshooting
Symptom
6 The system <Indoor unit>
produces Immediately after turning ON
sounds. the power supply, indoor unit
produces "ringing" sounds.
<Indoor and outdoor units>
"Hissing" sounds are
continuously produced while in
cooling or defrosting operation.
<Indoor and outdoor units>
"Hissing" sounds are produced
immediately after the startup or
stop of the system, or the
startup or stop of defrosting
operation.
<Indoor unit>
"Creaking" sounds are
produced while in heating
operation or after stopping the
operation.
<Outdoor unit>
Pitch of operating sounds
changes.
The pump is making noise
(cavitation).
7 Outdoor unit fan In operation
does not rotate.
8 LCD display "88" Immediately after turning ON
appears on the the power supply
remote control.
9 The outdoor gets While stopping operation
hot.
10 The water pressure relief valve leaks.
11 Malfunction of the schedule timer.
118
Supposed Cause
These are operating sounds of
the electronic expansion valve of
the indoor unit.
These sounds are produced from
gas (refrigerant) flowing
respectively through the indoor
and outdoor units.
These sounds are produced
when the gas (refrigerant) stops
or changes flowing.
These sounds are produced from
resin parts expanding and
contracting with temperature
changes.
The reason is that the compressor
changes the operating frequency.
There is air in the system.
Water pressure at pump inlet is
too low.
The reason is that fan revolutions
are controlled to put the operation
to the optimum state.
The reason is that the system is
checking to be sure the remote
control is normal.
The reason is that the compressor
is warmed up to provide smooth
startup of the system.
The expansion vessel is broken.
The water volume in the
installation is too high.
Dirt is blocking the water pressure
relief valve.
The schedule timer does not work
but the programmed actions are
executed at the wrong time.
ESIE09-08
Countermeasure
Normal operation.
This sound becomes low after a
lapse of approximately one
minute.
Normal operation.
Normal operation.
Normal operation.
Normal operation.
Purge air.
• Check on the manometer that
is sufficient water pressure.
The water pressure must be >
0,3 bar.
• Check that the manometer is
not broken.
• Check that the expansion
vessel is not broken.
• Check if the pressure of the
expansion vessel is correct.
Normal operation.
Normal operation.
This code is displayed for a period
of approximately one minute at
maximum.
Normal operation.
Replace the expansion vessel.
Make sure that the water volume
in the installation is under the
maximum allowed value.
Check for correct operation of the
pressure relief valve by turning
the red knob on the valve counter
clockwise:
• You should hear a clocking
sound.
• In case the water keeps
running out of the unit, close
both the water inlet and outlet
shut-off valves first and then
replace the relief valve.
Check if the clock and the day of
the week are set correctly, correct
if necessary.
Troubleshooting