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you probably wouldnt get an oem replacement unless thru rheem dealer or distributor ---multi reasons on cap failure --dirty condenser coils--fan ---weather-- environmental--power supply interruption --- and those are the correct caps https://www.justanswer.com/hvac/b4b4e-old-rheem-model-rahe-042jas-size-capacitor.html
the starting capacitor was connected at the one line of the compressor motor then the value was label at the body of he capacitor, like 450v/ 5uf. to determined that the capacitor is totally worn out you will need a analog tester or a capacitance meter. usually if the starting capacitor get bad the motor doesn't run or hard to rotate.
Window unit or outside unit? Start and run caps are large problems,especially after several years operation or a lightning storm. Post more info. A humming sound in a fan or compressor that won't start usually means the capacitor got blown out.. It cost less than $30. (plus service call). LOL
Check outside unit if unit and compressor are running feel the large line to see if it is cold. If compressor is running and line is not cold possible charge problems. You may have a capacitor problem outside. they go out quite often. You can change this yourself, Open up outside unit and the cap is the silver bullet with terminals out the top. Bad cap can cause compressor to not operate and also the fan. You need to clean the coil inside or at leat check the coil to see if it is clean. You can clean theis with a toilet brush do not go against the coil bit brush with the fins. You may need to call a service tech but try these options first. russ
These units use a large valued capacitor rather than a battery. If memory serves me corectly, on these units the cap is located on the front panel board. It is usually either a 1 farad cap or a 2.2 farad cap at 3V.
However, if it is the ORIGINAL motor, check the dual run capacitor for proper microferrad value. It may be that it is swelled up on top and that is a direct indication it is a fouled capacitor. If the top is not pregnant or swelled, and it still looks like the top of a soda pop can, you will need a microferrad meter.
Disconnect ALL power to the condensing unit. If in doubt, kill the power to home. Remove 1 wire from the capacitor, the brown one or the one that is marked "FAN" and set your meter to Mfd, measure with your leads the value between the COMMON and FAN terminals. They should be within 6% of the rating on the capacitor. There is no rule of thumb here, you must know the correct value and see if it is equal or within the 6%. If it is under the 6%, you will need to replace the DUAL RUN CAPACITOR. No question, because it is a dual run cap, it controls the Compressor also. Best to change the whole capacitor with that of equal value.
God Bless.
ACMAN66 (Erik)
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