Coffee maker RIVAL MODLE CM800

Several possibilities:

• bad thermostat
• bad timer
• bad element

You can check all the items except the timer (if electronic) by disassembling the unit and using a multimeter. The thermostat is a black button about 12 mm (1/2 inch) in diameter with two wires. The heater is usually part of a casting and has connectors on it. Also, cycle all connectors to defeat corrosion.

Mine did this too, check for a hidden Zehner Diode. Mine came inline before the heating element. I thought it was the thermostat or the element but turned out that the diode failed and i was able to bypass it for a sec, and i mean literally a sec, and turn on the mach. Heating element heated right up, which is all i wanted to see. Looks like once i determine the value of the diode, i should be able to replace it and coffee maker will most likely be fine again. :) I think i can read the numbers, and it looks like 1250v 10A for mine, you should examine the casing of diode closely and you may find numbers on it.