ESIE09-08B Symptom-based Troubleshooting
Troubleshooting 119
1. Symptom-based Troubleshooting
Symptom Supposed Cause Countermeasure
1 The system does not start operation at all. Blowout of fuse(s) Turn Off the power supply and
then replace the fuse(s).
Cutout of breaker(s) • If the knob of any breaker is in
its OFF position, turn ON the
power supply.
• If the knob of any circuit
breaker is in its tripped position,
do not turn ON the power
supply.
Power failure After the power failure is reset,
restart the system.
Open ph
ase in power supply
cable
Check power supply. After that,
properly connect the power
supply cable, and then turn ON
the power supply.
2 The system starts operation but makes an
immediate stop.
Blocked air inlet or outlet of
outdoor unit
Remove obstacle(s).
3 The unit is turned on but the unit is not heating as
expected.
The temperature setting is not
correct.
Check the controller set point +
settings (room + water).
Capacity shortage. Check if the cooling fans at the
rear of the switch box are working
properly.
The water volume in the
installation is too low.
Make sure that the water volume
in the installation is above the
minimum required value.
Check if there is no bypass of the
water circuit.
The water flow is too low. • Check that all shut-off valves of
the wa
ter circuit are completely
open.
• Check if the water filter needs
cleaning.
• Make sure there is no air in the
system (p
urge air).
• Make sure that the expansion
vessel is not broken.
• Check the water pressure on
the manometer > 0,3 bar.
4 The system does
not operate.
The system stops and
immediately restarts operation.
If the OPERATION lamp on the
remote control turns ON, the
system will be normal. These
symptoms indicate that the
system is controlled so as not to
put unreasonable loads on the
system.
Normal operation. The system will
automatically start operation after
a lapse of five minutes.
The remote control displays
"UNDER
CENTRALIZED
CONTROL", which blinks for a
period of several seconds
when the OPERATION button
is depressed.
The system is controlled with
centralized control.
Recovery/vacuum mode is active
(higher priority mode).
The system stops immediately
after turning ON the power
supply.
The system is in preparation
mode of micro computer
operation.
Wait for a period of approximately
one minute.
5 The system
makes
intermittent
stops.
The remote control displays
malfunction codes "U4" and
"U5", and the system stops but
restarts after a lapse of several
minutes.
The system stops due to an
interruption in communication
between units caused by
electrical noises coming from
equipment other than air
conditioners.
Remove causes of electrical
noises.
If these causes are removed, the
system will automatically restart
operation.
ON
OFF
Knob
Tripped
Circuit breaker
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