Vic, initial usage this year. Press flush button, green light comes on; ~13 seconds later amber lite flashes as well. With green light on, the amber light flashes 4 or 5 times and red lite comes on shutting down unit. Could this be a frozen (rusted) secondary mixer causing red light to come on & shutting down unit ? I haven't had a chance to give mixer a couple good wacks with a hammer as yet.