HEXA

HVAC

B DISPLAYING BLINK CODES

1. Activate the diagnostic mode.

2. Press the AC button and keep it depressed for 5 seconds or more.

3. The recirculation LED will glow for 5 seconds and be OFF for 5 seconds to confirm that the blink codes will be

displayed.

4. After this the recirculation LED will start giving out the blink codes.

Pattern A

Pattern B

OFF

Blink Code (1,2)

5 sec

Start Pulse

5 sec

Stop Pulse

Pause after Blink Sequence

AC Key pressed and

held for 5 seconds to

query faults

NOTE

All faults (permanent, temporary and history) shall be displayed by the control head. The user shall be able to

distinguish the permanent and non-permanent (temporary/history) by erasing the faults after querying them once.

C READING BLINK CODES

A blink code sequence comprises of 2 blink patterns A and B in the sequence A,B. Blink pattern A and B is dif-

ferentiated by the ON and OFF timing delays:

a. Blink Pattern A has 1 second ON time and 1 second OFF time.

b. Blink Pattern B has 0.5 seconds ON time and 0.5 seconds OFF time.

c. Blink pattern A is followed by Blink Pattern B with a time delay of 2 seconds.

A sample blink sequence (2, 2) is indicated as illustrated below.

0.5s

Pattern

Recirc LED Status

OFF