Question about Mitsubishi MXZ-2B20NA-1 Mr. Slim Dual Zone Wall Heat Pump 18 Seer
Posted by Anonymous on
When an 'inverter' system switches modes, essentially what happens is nothing more than a solonoid coil in the 4-way reversing valve energizes changing the direction of refrigerant flow. Its almost a non-discernable sound due to the small size and small quantity of refrigerant typically in small capacity ductless splits.
Due to the low discharge air temperature of a heat pump as compared to a fossil fueled heating supply, it is sometimes difficult to decide what mode they are in by feeling the air temperature. Fossil fueled heat sources are based on a 70 degree temperature rise meaning, if your house is 70 degrees, it will put out approximately 140 degrees. Conversely, a heat pump discharge air temperature is typically in the 85 degree range.
To determine for sure, take an accurate probe type thermometer and place it in front of the discharge air grill and observe the temperature in the cooling mode for 5 minutes. Then switch the system to the heat mode and observe the temperature for 5 minutes. You should then be able to easily determine if in fact it is or is not going into the heat mode.
Trouble shooting is done through a series of codes you enter by pushing a sequence of buttons on your remote. When the correct codes are applied, the digital display will give you error codes that then can be utilized to repair the unit. Mitsubishi essentially 'wrote the proverbial book ' on ductless mini-splits and are the Cadillac of the ductless split world.
Posted on Dec 28, 2014
Unfortunately these units are not user fixable , beyond checking for power and checking battery in remote. You would need to call a pro who is able to get service information and has special digital logic meters to diagnose and repair .
Posted on Oct 05, 2014
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