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Yes, hose needs to connect to outdoors, since it operates as a heat pump. You'll notice cold air blowing out the exhaust when in heating mode, and hot air blowing out the exhaust in cooling mode - unit exhausts opposite of temperature you want.
John, unfortunately, you don't have many options, short of putting a hole in an exterior wall and putting an exhaust pipe with a cap (like a dryer vent has) and connecting the exhaust hose to it. OR if you have a clothes dryer in your condo and it's vented to the outside. You could temporarily disconnect the dryer's vent hose and connect the A/C's vent hose to the the dryer's outside vent.
Either way, it may be to much of a hassle . But, I'll let you decide that. I guess it will all depend on how hot your condo gets without A/C.
Remove the top panel closest to the wall after you remove filter. Check all the connections for exhaust and air intake. You can remove the air intake pipe (looks like a smaller diameter vacuum cleaner hose but Gray in color) and run the unit with it off of the vent. If unit starts and stays on, the inducer blower is getting weak and will need to be replaced. There is also two small hoses (clear and blue) that may have come off the vent or even cracked or chewed by a mouse. Inspect them for cracks or damage. You may have to take off the right side panel closest to the wall to get to the hoses. Next, remove the many screws that hold the front panel on the heater. Take off the front cover and check to make sure all the hoses are connected and that the inducer fan runs. You can even take a shop vacuum and put it over the center hole on the vent to make sure something is not lodged inside where you can't see it. Yes there is a recall for a gasket that deteriorates over time. It is located at the view port of the flame. Contact Rinnai at (US) 8006219419 for details. Hope this helps.
OK Ray, you have a mode door stuck in between it's seat, the mode door is kind of what it sounds like, the cool mode or the heat mode. It moves to the mode it is in. your heater core and your A/C evap are just inches apart and the door moves to let air flow out as needed. So it sounds like the door is not opening or closing all the way. You may have to get under there and pull out the dash to check. Or could be just a heater duct hose loose from the vent on YOUR side not HERS (never hers). No mater what.
To your question the answer is YES, generally vented to the outdoors through a window. Generally speaking there are two hose connections for cooling the refrigeration end of the A/C. one should supply cool air from outside and the other should discharge the hot air outside. If not vented to the outdoors your build heat instead of cooling.
Its not good that you dont know where the air filter is. Odds are there may not even be one in place. In Most mobile homes they dont pay much mind to proper filtration. The heat strips are covered with dust. If the heat Strips are that bad then usually the whole unit is clogged. Is there a unit inside the mobile home?? Or is the unit outside quite large and have ducts running to it??