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I have a Fujitsu Split unit inverter with a second evaporator in the attic. I am not impressed with them. I have found that disconnecting the power at the mains for a couple of hours, either with the breaker switches off, or the outside isolator effects a good power reset. If you listen at the outside condenser unit, you will hear clicks and rattles as it goes through a test procedure. Don't switch on for 15 minutes.
Hottest weeks of the year and the vent on the inner high level unit fails to open! :>(
Very likely the outside (condenser) coil is coated over with lint or leaves from the air flow of the fan blade. Generally, the obstruction cannot be seen, because it is inside the cabinet. Try this to clear the air blockage: Go inside the house and unplug the unit. Go outside and use a garden hose, with the nozzle set to a hard stream and the water supply on full.
With the nozzle held against the coil, direct the water stream straight through. Move the nozzle slowly across the entire surface of the coil several times to blow the trash off the coil to the inside of the cabinet. The unit should then continue to cool as designed.
It should still be in warranty as Fujitsu usually goes for 5 years. Get in touch with Fujitsu to find a local warranty agent. There's not enough info in your post for a diagnosis. Are the lights flashing? If so, what sequence are they flashing? Does the indoor unit otherwise work normally in 'fan' mode? What model do you have?
doesnt sound like a gas problem. theres a vavle they opens and closes inside the unit that might be playing up either the vavle or the indoor pc board. did it ever cool ? might also be the vavle on the outside unit were not open with the alan keys so theres no gas going to them .
you did not specify...if this is a heat pump, make sure you have 24 vac on the O, orange wire at the unit from the stat ...(0vac on Rheem, Ruud). If you do, you may have a bad coil on the reversing valve or a stuck reversing valve, or very low on refrigerant.
Reverse setting could need checking here sliding valve could have siezed. you would need a service Technition. your default setting is working fine so it needs to be checked on heating mode function.
It sounds like you have a unit called a heat pump. When a heat pump unit is in cooling mode the outside unit blows hot air and the inside unit blows cold air. If the outside unit is blowing cold then the indoor unit is most likely blowing room temperature or warm air. It sounds like the thermostat could be controlling incorrectly or you could have a failed reversing valve which is the device that switches the unit from heating to cooling mode.
is the inside unit in a closet or the attic. if in the attic there may be a float switch in the drain pan and you might have hit it causing the outside unit not to come on
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