Craftman 1.5hp air compressor won't start under load. On a service call today compressor will not start. Location Austin Texas 78727. Condenser fan motor is running fine. The motor is probably not original to the equipment, and it may or may not be the right size/type. You may hear it humming or observe that it's getting hot. Mostly because some commercial air compressors are placed outside the facility with no insulation facility. This troubleshooting guide will help you go step by step to figure out what’s wrong. It shows it is on load but will not build pressure. Its definitely something in that electrical box. If the capacitor has failed the symptom is that the motor won't start. I will check all the connections and post up my final resolution. Replace rings. 2. I got 240 v at t1 t2 on contactor. Drain down to bottom of threads. But it won't start under load. Air Compressor Not Working in Cold Weather During winters, when the average temperature falls below 40-degree Fahrenheit, air compressor tends to show glitches or have trouble starting. If depressing this allows the compressor to start under load, that would suggest that it is not happening automatically, and … I believe this has happened once before and years ago so I don’t remember what was done to fix the problem. I tested windings and they came up ok. Capacitor is good and also tried new one on my truck, still compressor wont start. When an air compressor fails to start up, shut down or provide any degree of air pressure while active, the problem could be down to one of several issues. The compressor won't even start up under zero load. Wrong oil viscosity. But am anxious to get the Lightning back up and running. It jerks a bit, then stops and sits there, and if I leave it long enough I can smell it burning a bit. Have enough air in both SCBAs to hold me a while and a hand pump. So we’ve taken some of the stress away from you by compiling a list of the most common reasons why an air compressor won’t start. I have a Kaeser twin screw compressor we use in our countertop shop. Jan 19, 2018 #1 I pulled the compressor head and piston runs smooth up and down. Check viscosity and change oil if necessary : … What else should I check? Each case should be taken on its own, as follows: 1. An unloader valve from California Air Tools can fit into a DEWALT. Excessive oil in compressor. Won’t Start or Won’t Stop. It has worked flawlessly till this afternoon when it stopped building air. 4. I did send an email to Hatsan. When the air compressor won’t build air pressure due to a faulty unloader valve, install a replacement valve from another brand. Jul … Worn piston rings. Compressor Fails to Start An air compressor for home garage applications uses universal unloader valves. 3. If you are searching for the phrases air compressor won’t turn on or air compressor won’t start; this post should help clarify why and offer solutions to get your air compressor working again.The reason your air compressor won’t turn on may be a number of different problems. Temp of compressor is 98 degrees F. Drawing 0 amps Why the heck wont this compressor start ? Clean air filter element and check for other restrictions in the intake system. Electric motor starting & run capacitor troubleshooting FAQs Questions & Answers about Electric Motor Start-Boost or Run Capacitors Capacitors are electric devices that get an electric motor running at start-up or that help keep a motor running once it has started. Thread starter ed2hess; Start date Jan 19, 2018; E. ed2hess LawnSite Fanatic. Compressor air intake restricted. We know how frustrating it can be when you go to turn on your air compressor and it isn’t working. 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