Roca CRONO 4-G COMPACT Instrucciones De Instalación, Montaje Y Funcionamiento Para El Instalador página 29

6.1 OPERATING FAULT DIAGNOSTICS
The control box has a self-diagnostic system, which easily allows identifying the operating faults (RED LED
signal).
To use this function, wait at least ten seconds from the safety lock out, and then press the reset button for a
minimum of 3 seconds.
After releasing the button, the RED LED starts flashing as shown in the diagram below.
RED LED on
wait at least 10s
The LED gives of a blink code every 3 seconds.
The blink codes give the information about the possible faults, as follows:
BLINK CODE
2 blinks
3 blinks
4 blinks
5 blinks
7 blinks
18 blinks
19 blinks
20 blinks
3217
Press reset
> 3s
for
POSSIBLE CAUSE
The flame does not stabilize at the end of the safety time:
– faulty or soiled ionization probe;
– faulty or soiled fuel valves;
– neutral/phase exchange;
– poor burner regulation.
Minimum air pressure switch does not close:
– air pressure switch faulty;
– air pressure switch incorrectly regulated;
– fan motor does not run.
Minimum air pressure switch does not open or extraneous light on burner start-up:
– air pressure switch faulty;
– air pressure switch incorrectly adjusted.
Extraneous light during pre-purging, or control box faulty.
Loss of flame during operation:
– poor burner regulation;
– faulty or soiled fuel valves;
– short circuit between ionization probe and earth.
Minimum air pressure switch opens during pre-purging or operation:
– air pressure switch incorrectly regulated;
– the flame disappeared 4 times during working (3 attempts allowed).
Faulty on output contacts of control box:
– wiring error;
– power could be present in the outlet loads.
Control box faulty.
Blink code interval
14 GB
3s
Blink code