Ok On the display hold the up arrow for 5 seconds then let go. It will tell you the temperature. Do you have and er at the display? Is the unit outside? What is the temperature(ambient) around the unit? If you hold the up and down arrows together for 5 seconds then release it will show you thermistor temperature for 2,3, and 4 You should only get 2 to give a temperature. 1=refrigerator temp and 2=evaporator temp.
Make sure the condenser is clean from dust.
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