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The display has the internal sensor for temp and barometer, The 5 in one has the sensor for outdoors and shows temp, wind speed and direction, humidity and rain. With the added lightning detector having the additional temp sensor in it, the system is redundant. It is recommended to put the sensor outside for best results that t have the least interference and maximum range..
The outside ambient temp has little effect on the suction pressure. The indoor temp is what will slightly effect the suction pressure. In the trade we say we want a 40 degree evap coil, this means approximately 125psi. This is when the indoor temp is around 74 to 78 degrees. The hotter the house, the higher the pressure. I like to see a 50 degree evaporator when the indoor temp is above 80. Charging by subcooling is the way to go!!
I have experienced the same with numerous different, "quote un quote" atomic clocks! Please don't forget that this sender unit, that goes outside, generates a RF Singal to be received by the clock inside. This unit transmits a signal 433 MHz signal approximately every. 3 minutes, and after so many years the sender unit's RF section(electronics) just goes out or no longer function properly or not at all! The transmitter/sender for this model number, according to "3M" is obsolete and can no longer be furnished, DRATTS !!!!!
unit should be locked out on low temp and your electric heat should be running. is your installer a service tech or just an installer that could also be the problem if he is a service tech it would work correct when he left