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H16 on this model means that either the power supply transformer has failed, The outdoor PCB has failed or the machine is low on gas.
This info is from the Panasonic service guide. The outdoor unit LED 1 is on, LED 2 is on, LED 3 is off, LED 4 is off.
H16 On On Off Off Current Transformer Problem Power Transistor Module or Outdoor PCB Faulty. Very Low Gas
sounds like a stuck expansion valve, the compressor makes pressure, but it can't be released to absorb heat from the desired environment. You could go to the manufacturer's website, request a detailed diagram of your system, find the expansion valve and order a new one. Can you put it in yourself and recharge the system? Probably not, call a repairman.
I had the 250 eq ( N.G.) for 3 years and have been dealing with bosch advanced tech service for the same amount of time. they sent me a new 2400 es( same thing, new model # ) last week and still having same problems. So i called them back. I'm on a well and come to find out after 3 years of dealing with them and after them sending me a new one, that they do not work well, on well systems,do to the varying water pressure. (no kidding!!!) After dumping tones of cash in to the darn thing they just sent me a mixing tank and mixing valve free of charge! I don't know if it will work do to the fact I have to install it yet. The best I can say is to call the tech dept at the 800 # on the back of your owners manaul and good luck seeing that no one knows how to service them!!!!!! PS You will need a manometer to measure the gas pressure at the valve.