Daikin EWYQ180DAYN [423/524] Overview of start problems

ESIE06-05 Overview of Fault Indications and Safeties

Part 3 – Troubleshooting 3–23

1.8 Overview of Start Problems

Introduction When a safety device was activated, stop the unit and find out why the safety device was activated

before resetting it. Under no circumstances safety devices may be bridged or changed to a value other

than the factory setting.

Symptom 1: The unit does not start, but the ON LED lights up.

Symptom 2: The unit does not start, but the ON LED is flashing.

Symptom 3: The unit does not start and the ON LED does not light up.

Possible causes Corrective action

The temperature setting is not correct. Check the controller setpoint.

The flowchart timer is still running The unit will start after approximately 15 sec-

onds. Make sure that water is flowing through

the evaporator.

The circuit cannot start up Refer to Symptom 5: The circuit does not start

up.

Unit is in manual mode (all compressors at 0%) Check on the controller

Power supply failure Check the voltage on supply panel.

Blown fuse or interrupted protection device. Inspect fuses and protection devices. Replace

by fuses of the same size and type.

Loose connections. Inspect connections of the field wiring and the

internal wiring of the unit. Tighten all loose con-

nections.

Shorted or broken wires. Test circuits using a tester and repair if neces-

sary.

Possible causes Corrective action

The remote ON/OFF input is enabled and the

remote switch is off.

Put the remote switch on or disable the remote

ON/OFF input.

Possible causes Corrective action

The unit is in failure mode. Check safety devices.

One of the following safety devices is activated:

■ Flowswitch (S8L, S9L).

■ Emergency Stop.

Check safety devices.