Daikin Altherma HT Wartungshandbuch PDF herunterladen (Seite 139)

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.

OFF

Knob

Tripped

Circuit breaker

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