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According to the manual, page 23, "H:HH" means "Temperature in breadmaker is too high". The solution is to "Press the Stop button. Remove the baking pan, leave lid open and allow to cool. When cool, put the baking pan back in, set program and start the program again."
HH is over heat. If you have a manual Hi Limit Sensor try reset the sensor with the push button on the heater. If you have an electric system unplug then reattach the hi limit sensor on the board. If neither works it's likely the hi limit sensor has failed or another overheat event has damaged the spa.
I, too, have just seen (late June 2013) the "HH" code on my Magic Chef wine cooler (and it is running too cold and I can't reset the temperature). Have you found a solution since your posting of about 1 year ago?
HH means it is showing the high temperature you (most likely accidentally) set with the MAX MIN / + button, which is easy to do when setting the clock. Just press that button again until the reading appears.
The HH indicates that the control believes that the temperature is over 99. This happens when a) it is over 99 degrees (not likely or you would not be using the heater), or b) the thermistor is not plugged in or bad.
a) unplug your heater
b) remove the control cover (two screws where the display and knob are)
c) find the thin black wires with a green connector on the end. The other end of the wire are attached to the thermistor which looks like a balistic missile.
d) plug the green connector onto the white two pin connector on the circuit board. This is the only place that it will fit.