Symptom-based Troubleshooting ESIE11-05
102 Troubleshooting
5 The system
produces
sounds.
<Hydrobox and outdoor units>
“Hissing” sounds are
continuously produced while in
cooling or defrosting operation.
These sounds are produced from
gas (refrigerant) flowing
respectively through the hydrobox
and outdoor units.
Normal operation.
<Hydrobox 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.
<Hydrobox unit>
Faint sounds are continuously
produced while in cooling
operation or after stopping the
operation.
These sounds are produced from
the drain discharge device in
operation.
Normal operation.
<Hydrobox 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 operating 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
there is sufficient water pressure.
The water pressure must be > 0,3
bar (water is cold); >> 0,3 bar
(water is hot).
6 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.
7 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.
8 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.
9 The water pressure relief valve opens. 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.
10 The water pressure relief valve leaks. 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.
12 The system
produces
sounds.
<Outdoor unit>
“Hissing” sounds are
continuously produced while in
cooling or defrosting operation.
These sounds are produced from
gas (refrigerant) flowing
respectively through the hydrobox
and outdoor units.
Normal operation.
<Outdoor unit>
“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.
<Outdoor unit>
Pitch of operating sounds
changes.
The reason is that the compressor
changes the operating frequency.
Normal operation.
Symptom Supposed Cause Countermeasure
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