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Need some help with non-heating mitsubishi mini-split
Hello everyone - thanks in advance for your time.
We just had a mini-split system installed - outdoor unit MXZ-3C30NA2-U1 30k BTU UNIT with 3 indoor units installed connected to the one outdoor unit models are MSZFH12NA (x2 of these) and one MSZFH09NA. So two 12000 BTU units and one 9000 BTU unit connected to that outdoor unit. We were told prior to installation that this model was rated to negative temperatures, which we rarely get where we live in Idaho. However since installation it has been around 20-30 degrees during the day and getting into single digits at night and the house is FREEZING. Okay, maybe not freezing but sitting in my living room where there is a 12000 BTU unit is is 59 degrees with another electric heater going!
This is not what we were sold and we thought our house would be comfortable. So here is my question - is our outdoor unit being over taxed with the 3 heads? Is there another reason that this could be happening? A service tech is coming out today but short of draining the lines and recharging the system correctly I am not sure what else we can do. I don't know how much line they used on install but I do know they did not add any extra refrigerant other than what is covered up to 25 ft or something. I will find out more from the tech, but is this model rated at negative temps? And is the capacity on it too high for it to work properly? All I've found online says it is rated to 17 degrees outdoor temp.
Please help! Thank you!!!