I have a UAMB-042 JAZ unit. Sometimes the A/C will kick on and within several seconds the outside unit will stop and the inside unit will keep running. If you go outside and push the high pressure reset button the unit will start and continue to run. I have had it cleaned and checked for freon. They also changed the fan motor and drained the freon to see if the expansion oriface may be clogged. The unit still has the same problem. The problem is intermitent and hasn't occurred with gauges attached to troubleshoot. Any ideas or help are appreciated.
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Re: High Pressure Shut Down
If the outside fan is running when this takes place and the condenser is clean, I believe its the High Pressure Control that is bad. There is a possibility that if the unit was opened and air was allowed to get into the refrigerant part on the system that it could cause this problem but unless the system was worked on just prior to this starting, I don't think this would be the case. The part about draining the freon to check the orifice doesn't sound right, This could be done with a pump down by closing the suction line valve at the condensing unit which leaves the freon in the condensing unit. If they charged you to replace the freon, I would question them about this procedure. Hope I have helped.
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1) Replace both fuses if there are any out by the unit *also make sure the breakers are not tripped. there will be two 2) if you get the unit running inspect the outdoor coil under the outside fins to see if the coil is stopped up with dirt,grass, etc. *if the coil is dirty, disconnect the unit from power, take the 4 screws out on the top of the unit that hold the fan motor assembly in place. Carefully set the entire motor, blade and assembly off to the side and be careful not to pull the motor wires loose. With a water hose and sprayer, carefully wash the condenser coil from the inside out. You will see a lot of debris on the outside fins you will have to wash off. Be careful not to have so much water pressure that you bend the aluminum fins on the coil itself. ** many times if the coil is stopped up this will cause the unit to overheat and trip breakers
TURN THE POWER OFF TO THE UNIT. TAKE THE BACK PANEL OF OF THE HEAT PUMP AND LOOK FOR A SQUARE PLASTIC BAG FASTENED TO THE INSIDE OF THE UNIT, IT MAY BE LOCATED BY THE CONTACTS AND SYSTEM WIRING OR ON THE PANEL ITSELF. REMOVE THE PAPER FROM THE PLASTIC AND THIS SHOULD CONTAIN YOUR WIRING DIAGRAM. ALSO LOOK ON THE BACK OF THE PANEL ITSELF FOR THE DIAGRAM. SOMETIMES THE DIGRAM IS PRINTED THERE.
Make sure that the breaker for the A/C is turned on, there should be a disconnect mounted on the wall, near the A/C unit outside. Ishould have a breaker or a set of fuses, the fuses will need to be ohmed out, as you cannot tell if they are bad just by looking at them.
Where the 2 copper lines connect to the A/C unit outside, there is a red reset button, push it in and make sure that it is not tripped.
I hope this gets you started in the right direction.
Have a great Day.
service once a year clean dirt and hose the coil out make sure power to outdoor unit is off also make sure you keep a new air filter change about every 2 months you should also have a tech test you pressures this could cause poor cooling also need to clean inside coil also a service tech will probaly need to do this good luck
This question is really to broad to answer. There are several things that could cause it to stop running. I think I would turn everything off, let it cool down for several hours and try it again. When you kick it back on, take note of what is running and what's not running. Inside fan, outside fan, compressor. If the outside unit will not run at all it could be as simple as a grasshopper caught in the contacts. If you hear the compressor running outside but no outside fan, The fan motor probably needs replaced. Please make sure that all power to the unit is TURNED OFF before removing cover plates on outside unit and before trying to remove insects from contact points. Check all wiring inside outside unit while it is open. Also check capacitors for swelling or leaking. If you don't know how to turn all the power off or open the outside unit, you need to call a professional AC technician. Hope this helps.