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If this is a ductless mini split e4 appears to be an air temp sensor on the indoor or outdoor unit that is sensing an abnormal reading. Check air filter and both I.d & o.d coil cleanliness. Its hard to troubleshoot without a model number. If its a 38g or 40g in the model number its a discharge temp sensor reading high temp situation (dirty o.d. coil, low freon, refrigerant restriction. Again, need a model #
unit's are usually charged in pounds not psi...units require a certain pound amount of freon to work properly....... it depends on the outside air temp, the inside air temp.... what type freon ?? need more details on unit and what type freon does it use??
If any part of the coil is freezing then there is a restriction inside the line and the unit needs to be recovered and vacuumed and recharged to proper level
On the manufactures tag, it will list the pounds and ounces, that is required, this usually includes, about 25 feet of line, usually add 1 1/2 ounces per foot past that.
Sincerely,
Paul
PS. It is best to weight the charge in with electronic scales designed for this,
My Carrier unit did the same thing. It was low on refrigerant (Puron in my unit). I am worried I have a leak somewhere. Hopefully, it is not in the coil. The service call wasn't cheap either. Puron runs around $10-15 a pound and mine took several pounds to replenish.
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