I have a Turbo Air M3R47-2. How to prevent the chiller reverting to default temperature setting No.4 after electricity goes and comes.

'make model (what it is) helps in such questions Cyndi, then we can look it up for you.

You can Google

make model manual

NORMALLY, the section for white wine sections sets the main temperature, and the red wine section is basically insulated from them.

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There are a few potential reasons why your chiller may not be shutting down even when it reaches the set temperature:

1. Faulty temperature control: If the Ranco temperature control is faulty, it may not be sending the correct signal to shut off the compressor and fan. Try replacing the temperature control to see if this resolves the issue.
2. Incorrect wiring: Make sure that the compressor and fan motor are wired correctly through the Ranco temperature control. If the wiring is incorrect, the temperature control may not be able to properly control the chiller.
3. Dirty condenser coil: A dirty condenser coil can cause the chiller to run constantly as it struggles to cool the refrigerant. Check the condenser coil and clean it if necessary.
4. Low refrigerant charge: If the chiller is low on refrigerant, it may run constantly as it tries to maintain the set temperature. Have a technician check the refrigerant level and add more if necessary.
5. Faulty compressor: A faulty compressor may continue to run even when the set temperature is reached. Have a technician check the compressor to see if it needs to be repaired or replaced.

Brand? Model?
There should be a display (digital) at top of chiller or at least one or two dials at the rear of chiller cabin near the sides. You should be able to set each area by adjusting dial(s). Though there are some units that have only one dial as with the Sears brand that will presume you load the wine bottles at the top or bottom of box.
Aloha, ukeboy57

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A crankcase heater is an electrical component in a compressor in an air-conditioning system, heat pump system, or chiller system. The crankcase heater is normally on all the time, even when the unit is not running, though temperature sensors and set points may turn it off when not needed. A crankcase heater's sole purpose is to prevent refrigerant migration and mixing with crankcase oil when the unit is off, and to prevent condensation of refrigerant in the crankcase of a compressor. The crankcase heater keeps refrigerant at a temperature higher than the coldest part of the system. A crankcase heater generally has the same electrical symbol as a resistor because it converts electricity directly into heat via electrical resistance. The resistance in the heater coil determines the heat it produces when voltage is applied

no there is not

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You have 240Volt electric water heater.
Lower thermostat is set as low as it can go at 77.
But you want water temperature set to 66?
First thing to remember is that water heater thermostat settings are approximate since they read temperatures through the steel tank wall.
Second thing is that thermostats for electric water heater are generic, and are not made for lower temperature range settings. This is probably since most people complain that water is not hot enough.
I'm looking at a generic lower thermostat from Lowes right now. The low temperature setting is 90 degrees F.
Looking at some older thermostats from a drawer right now: one does not have a lower temperature mark, the other is a Reliance with low temp of 95, the old craftmaster goes down to 80.
So I don't even have a thermostat that goes as low as the one you have, except for gas water heater thermostats that traditionally can be set to 50 degrees for vacation mode to prevent freezing.
More thermostats can be seen on following link:
http://waterheatertimer.org/How-to-adjust-temperature-on-water-heater.html

Letting perishables such as milk and eggs get warm doesn't just effect the taste; it can also allow bacteria to grow. It's essential to guard against this by adjusting your refrigerator temperature when necessary. Read below for how to do it.

1 Measure the temperature of you refrigerator. To measure the temperature in a fridge without a thermostat, just place a normal thermometer in a glass of water and place it inside the fridge. Check back 5 to 8 hours later to see what temperature the water is. This allows you to determine the temperature indirectly.

2 Adjust the temperature. Once you've identified your refrigerator's temperature, it's time to change the settings. Turn the indicator to the left to make the temperature warmer, and to the right to make your refrigerator colder. It is important to only change the temperature gauge by one setting, regardless of how much you think it must be adjusted. This prevents freezing or thawing of food by making the change gradually.

3 Check the temperature again after 6 to 8 hours. If it's the temperature you want, you're set. If not, move the dial one setting colder or warmer, depending on your needs. The ideal temperature for a refrigerator is 40 degrees. Wait at least 24 hours in between each adjustment to allow the fridge time to achieve that temperature.

4 Prepare for changing seasons. Where you live can have a big influence on your fridge's temperatures. You may need to adjust the temperature lower in the summer and higher in the winter to maintain a constant 40 degrees. Those who live in moderate climates can worry less about weather effecting their refrigerator's temperature.

5 Check the air vents. If you're having trouble achieving the right temperature, even after numerous adjustments, make sure the vents on the inside of the fridge aren't covered. This can prevent air flow, making it impossible to cool the refrigerator

Hope this would help you.

Have a nice day!

Sounds like the stat is "defaulting" to factory setting, or, what are the programmed settings at? A programmable thermostat will revert to programmed settings unless placed in "hold". If all ok, time to get a new stat.