Kenmore 110 was just repaired. After serviceman left there was only cold water
Where is the switch in the back to turn on hot water?

Serviceman left my 110 Kenmore washer with only cold water. How can I fix that?

There is a faucet that supplies the hot water just like the cold water supply. You could have a stopped up screen where the hose connects to the machine. There are screens on each side that filter the water before it goes to the water valves. If something is wrong with the water temperature selector then you will have to replace it after you test it with a meter.