Symptom-based Troubleshooting ESIE09-08B
120 Troubleshooting
6 The system
produces
sounds.
<Indoor unit>
Immediately after turning ON
the power supply, indoor unit
produces "ringing" sounds.
These are operating sounds of
the electronic expansion valve of
the indoor unit.
Normal operation.
This sound becomes low after a
lapse of approximately one
minute.
<Indoor and outdoor units>
"Hissing" sounds are
continuousl
y produced while in
cooling or defrosting operation.
These sounds are produced from
gas (refrigerant) flowing
respectively through the indoor
and outdoor units.
Normal 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.
These sounds are produced
when the gas (refrigerant) stops
or changes flowing.
Normal operation.
<Indoor unit>
"Creaking" sounds are
produced while in heating
operation or after stopping the
operation.
These sounds are produced from
resin parts expanding and
contracting with temperature
changes.
Normal operation.
<Outdoor unit>
Pitch of operating sounds
changes.
The reason is that the compressor
changes the o
perating frequency.
Normal operation.
The pump is making noise
(cavitation).
There is air in the system. Purge air.
Water pressure at pump inlet is
too low.
• Check on the manometer that
is sufficient water pressure.
The water pressure must be >
0,3 bar.
• Check that the manometer is
no
t broken.
• Check that the expansion
vessel is not broken.
• Check if the pressure of the
expansion vessel is correct.
7 Outdoor unit fan
does not rotate.
In operation The reason is that fan revolutions
are controlled to put the operation
to the optimum state.
Normal operation.
8 LCD display "88"
appears on the
remote control.
Immediately after turning ON
the power supply
The reason is that the system is
checking to be sure the remote
control is normal.
Normal operation.
This code is displayed for a period
of approximately one minute at
maximum.
9 The outdoor gets
hot.
While stopping operation The reason is that the compressor
is warmed up to provide smooth
startup of the system.
Normal operation.
10 The water pressure relief valve leaks. The expansion vessel is broken. Replace the expansion vessel.
The water volume in the
instal
lation is too high.
Make sure that the water volume
in the installation is under the
maximum allowed value.
Dirt is blocking the water pressure
relief valve.
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.
11 Malfunction of the schedule timer. The schedule timer does not work
but the programmed actions are
executed at the wrong time.
Check if the clock and the day of
the week are set correctly, correct
if necessary.
Symptom Supposed Cause Countermeasure
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