A21 flame alarm cabinet 1 warn about 3 repeated attempts to ignite the cabinet 1 burner without success.
As a consequence, the unit inhibits burner operation and waits for an action by the operator.
This message does not necessarily require the intervention of a technician; confirm the message to start a new ignition sequence.
Description
The ignition panel of the chamber 1 burner does not recognize the flame on the detection electrode after 3 successive ignition attempts.
Reset
The error is reset by pressing on the error message window.
In special cases the system can go into deep lock. Before replacing the panel, try, after temporarily removing power, to restore by activating dry cooking and short-circuiting for 1 sec. inputs 80-81 of the gas plug-in.
Checks
In case of repeated alarms, carry out the following checks:
- Check basic conditions
- Check the correct phase / neutral connection of the power (0V neutral–ground)
- Check the correct type of gas (red or yellow sticker placed near the gas inlet of the oven, red for methane G20 and yellow for LPG G30)
- Check the supply pressure on the inlet IN of the gas valve, check the static pressure value, with burner off, (20-25 mbar methane and 30-37 mbar LPG) and the value of the dynamic pressure, burner on, (18-20mbar methane and 28-30 mbar LPG); if the pressure drop is higher, check the plant.
- Check from the service level menu burner management - burner chamber 1 operation:
- Make sure the blower turns
- After a few seconds, the spark must ignite on the ignition electrodes (230V at the ignition transformer)
- If the blower rotates but there is no voltage to the transformer the problem could be linked to the gas plug-in, electrical connection between plug-in and panel and EZ1 fuse
- If the voltage reach the transformer but the spark does not come, check / replace the ignition transformer but also check the position of the ignition electrodes on the burner head (distances 4-5mm between them and 8mm from the burner surface). Check also the integrity of the high voltage cables that connect the electrodes.
- If there is a regular spark and the burner does not light up (bring your hand close to the exhausts outlet to check for the presence of heat) it is possible a malfunction of the gas valve or an incorrect calibration (wrong nozzle).
- If the burner turns on but then turns off it could be a detection problem due to inverted phase/neutral, lack of earth, proximity between detection cable and ignition cables or flame detection electrode. To be checked.
- Check that there is no obstruction in the air intake or exhaust system that could reduce the flow of suction / flue gases and that the suction pipes are properly connected.
- Check the gas settings
- Reloaded the presence of the calibrated disc at the valve outlet for G30 absence for G20/25 and the length of the screw of MIX
- Boosted the nozzle section calibrated at the mixer/venturi inlet
- Compact the calibrated nozzle section between venturi and valve - If the problem persists check / replace the ignition panel (connection - valve pin) j) Check if the metal mesh of the burner is intact and that there is no interference with or deformations to the electrodes