Test the check valve by allowing the compressor to fill the tank until the pump shuts off. I see this many times during the start of the air conditioning season. Steve, I will be happy to try and answer any questions you have. If you are looking for an HVAC products supplier that will treat you the way you should be treated, turn to us. I recommend the SPP6 (sold below) over the SPP6E compressor hard start kits. Below we have a good YouTube video produced by Grayfurnaceman which talks about hard start kits and how to install a hard start kit. My ammeter shows high current draw for a few seconds and then stops. What is happening is the compressor is trying to start, but because the compressor motor being locked the compressor tries to start for a few seconds, and then because of the high amperage being drawn goes off on internal overload. Steve. Please enable javascript to view the website .. I have done the following : replaced the un capacitor, tried a start boost with the new capacitor, read all wires to the compressor to ground to heck for grounds, read the continuity on c,r,s and found them to be normal. Find out how to reduce air compressor noise. If the compressor isn't cycling on and off to fill the tank, replace the pressure switch. We have processed over 25,000 Successful PayPal Orders! We have same business day fast shipping! I would suggest that you or you have someone check the refrigerant charge by attaching gauges to your unit. If the pump starts when the tank is empty, then the check valve may be stuck open. The condensing unit made an attempt to start, then immediately turned off, then a couple of minutes later did the same thing. If you are getting 24 to 28 volts between these wires when the thermostat is calling for cooling then the thermostat is OK. If the hard start booster did not unlock your compressor then you probably need a new one. It might be possible to get a slow or hard-starting tight or even seized AC compressor motor going again - Or use the SEARCH BOX found below to Ask a Question or Search InspectApedia. The thermostat should send 24 to 28 volts to the fan relay on your air handler and outdoor contactor when in the Auto or Fan On mode. HARD STARTING COMPRESSOR MOTORS at InspectApedia.com - online encyclopedia of building & environmental inspection, testing, diagnosis, repair, & problem prevention advice. Place your order today! Where you stop getting the 24 volts then this is more than likely where your problem is. The internal overload protects the compressor windings from overheating and burning up. Please send us your unit’s model number.