Head on 262 not flushing

[sgorevski]

Hi Guys,

Hopefully this is an easy diagnosis. The head on my 2013 262 does not flush. The seacock is open, however when I press the black button next to the light switch, nothing happens. The macerator works as it starts going once I turn on the AuX toggle switch.

I have looked over the fuses and cant see any that have tripped or blown. Any suggestions would be greatly appreciated.