
If, as a first step, disconnect the equipment when you do not use it, this causes the voltage spike plate in the network to last and allows it not to be active when the equipment is turned off since it is still receiving power even when switched off and transforming it. Also see that the screen printing of the panel is not broken on the pushbuttons as this can cause moisture to enter and wet the plate by taking it out of service. Regards
By the flash it is not possible to be distinguished very well of which triac is the one in trouble, if it raises another image of the whole plate, we will place ourselves better in the problem of this one. Regards