Possible reason:
(1) the control circuit is interrupted
(2) Gas transmission is interrupted.
(3) Control failure
(4) Contactor does not act.
(5) Thermal relay is damaged.
Solutions:
(1) Find the disconnection point, contact or disconnect the regulator or monitor.
(2) Open the ball valve, and notify the gas management organization when the gas quantity is insufficient for a long time.
(3) Repair and replacement of dis-function parts.
(4) Manual reset inspection
(5) Replace the thermal relay