Daikin ALTHERMA HT EKBUHAA6 V3, Service Manual

Page: 140 / 302

Symptom-based Troubleshooting ESIE09-08A
130 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
continuously 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 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 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.
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 installation
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