| Problem | Likely Cause | Service Action | |---------|--------------|----------------| | High oil carryover | Worn separator element | Replace separator; check oil level | | Low oil pressure | Clogged oil filter or pump wear | Change filter; check pump clearance | | Compressor won’t unload | Broken slide valve spring or stuck piston | Remove unloader cover, repair piston | | Motor winding grounded | Moisture + acid from refrigerant breakdown | Replace motor; flush system with approved solvent | | Noisy operation (metallic) | Thrust bearing failure or rotor contact | Disassemble – replace bearings & check rotor alignment |
For new units, replace the oil filter after the first 500 hours. For regular operation, every 1,500 to 2,000 hours is standard. Troubleshooting Common Issues When the unit isn't performing, the MicroTech II controller mcquay hsa screw compressor service manual best
Take the time to source the official specific to your serial number. It is the difference between a quick, successful repair and a weekend of head-scratching frustration. | Problem | Likely Cause | Service Action
Perform a to check solenoid sealing and slide movement. High Noise at Start Reverse rotation or liquid slugging It is the difference between a quick, successful
A water flow switch (paddle type) must be installed to ensure adequate flow before startup, protecting against evaporator freeze-up. Troubleshooting Common Issues Potential Cause / Action Excessive Noise