Husky250
06-05-2008, 01:37 AM
A couple weeks back I posted regarding a thumping noise coming from a Sanyo inverter compressor. Today, I got another call regarding the same issue. Here are the details. New system, never ran. Sanyo PAC-I single zone system 36,000 BTU. Short piping run and Factory charge OK for piping run .On call for colling system goes through normal 3-minute time delay, and outdoor starts operation. Outdoor fan starts, and thumping noise can be heard from compressor. Fault code displays P-29
( Inverter Start Trouble ) The service manual indicates either compressor or compressor starting with a load ( liquid ) Recovered charge and re-started with same result , P-29 and same thumping noise inside compressor. The voltage supply to the compressor from the IPM is equal between all phases. Thanks to you fine folks I know how to check all that. At this point Im confident the problem is in the compressor. My problem is this: This is a new system that never ran. No crankcase heat currently on this model, but I think compressor is using a trickle circuit to provide heat for the compressor.Ambient conditions were cool at the time of installation. Service Technician swears they had power on 12 hours before test run, but I cant confirm. Do you guys think this could have taken the compressor out? Have any of you had a thumping compressor. It almost sounds like the compressor is only getting two phases of the three phases needed to run. Megger test good with nothing to ground, and resistance checked good per service manual, equal across all windings. Anyone got some advice? Thanks to all for any help!!
( Inverter Start Trouble ) The service manual indicates either compressor or compressor starting with a load ( liquid ) Recovered charge and re-started with same result , P-29 and same thumping noise inside compressor. The voltage supply to the compressor from the IPM is equal between all phases. Thanks to you fine folks I know how to check all that. At this point Im confident the problem is in the compressor. My problem is this: This is a new system that never ran. No crankcase heat currently on this model, but I think compressor is using a trickle circuit to provide heat for the compressor.Ambient conditions were cool at the time of installation. Service Technician swears they had power on 12 hours before test run, but I cant confirm. Do you guys think this could have taken the compressor out? Have any of you had a thumping compressor. It almost sounds like the compressor is only getting two phases of the three phases needed to run. Megger test good with nothing to ground, and resistance checked good per service manual, equal across all windings. Anyone got some advice? Thanks to all for any help!!