![Riello GS20/M Installation, Use And Maintenance Instructions Download Page 14](http://html1.mh-extra.com/html/riello/gs20-m/gs20-m_installation-use-and-maintenance-instructions_1459562014.webp)
2546001
12
GB
7.
FAULTS / SOLUTIONS
The control box has a self-diagnostic system, by which it is possible to easily check the faults and find the
solutions.
To use this function, wait for a minimum of 10 sec after the lock out, then push the reset button for 3 sec.
After releasing the button, the RED LED will begin to flash, as shown in the following schedule.
The LED provide a blink code each 3sec.
The blink codes give the information of the possible faults, as follows:
BLINK CODE
POSSIBLE CAUSE
2
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.
3
Minimum air pressure switch does not close:
√ make sure VPS trips to produce lockout;
√ air pressure switch faulty;
√ air pressure switch incorrectly regulated;
√ fan motor does not run;
√ maximum air pressure switch operating.
4
Minimum air pressure switch does not open or extraneous light on burner start-up:
√ air pressure switch faulty;
√ air pressure switch incorrectly adjusted.
5
Extraneous light during pre-purging, or control box faulty.
7
Loss of flame during operation:
√ poor burner regulation;
√ faulty or soiled fuel valves;
√ short circuit between ionization probe and earth.
18
Minimum air pressure switch opens during pre-purging or operation:
√ air pressure switch incorrectly regulated.
19
Faulty on output contacts of control box:
√ wiring error.
20
Control box faulty.
Press lockout reset
button for > 3s
Approx. 3s
Blink code
Blink code
Red fault LED
waiting time 10s