Daikin ALTHERMA HT EKBUHAA6 V3, Service Manual

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ESIE09-08A Symptom-based Troubleshooting
Troubleshooting 129
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 phase 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 water circuit are completely
open.
• Check if the water filter needs
cleaning.
• Make sure there is no air in the
system (purge 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