SG500-52P - why so many faults?

[mark]

12 Cisco SG500-52P switches on SW 1.4.5.02 and boot 1.4.0.02. These are all over the offices, some in stacks, some not.

One stack does this all the time. Switch is now unusable from web or console. 

07-Nov-2016 12:15:11 %HAL_config_poe-A-POEFailDetected: POE ERROR(i2c_read_mem failed. addr 0x1260, dev_num 1, val 0x0, retries 3) was detected
07-Nov-2016 12:15:14 %HAL_config_poe-A-POEFailDetected: POE ERROR(i2c_read_mem failed. addr 0x1248, dev_num 1, val 0x0, retries 3) was detected
07-Nov-2016 12:15:17 %HAL_config_poe-A-POEFailDetected: POE ERROR(i2c_read_mem failed. addr 0x1278, dev_num 1, val 0x0, retries 3) was detected
07-Nov-2016 12:15:20 %HAL_config_poe-A-POEFailDetected: POE ERROR(i2c_read_mem failed. addr 0x1204, dev_num 1, val 0x0, retries 3) was detected
07-Nov-2016 12:15:22 %HAL_config_poe-A-POEFailDetected: POE ERROR(i2c_read_mem failed. addr 0x121c, dev_num 1, val 0x0, retries 3) was detected
07-Nov-2016 12:15:25 %HAL_config_poe-A-POEFailDetected: POE ERROR(i2c_read_mem failed. addr 0x1234, dev_num 1, val 0x0, retries 3) was detected
07-Nov-2016 12:15:28 %HAL_config_poe-A-POEFailDetected: POE ERROR(i2c_read_mem failed. addr 0x1264, dev_num 1, val 0x0, retries 3) was detected

Another stack has 4 switches and there are 42 ports out of the 192 that show this: 

show power inline

Port     Powered Device       State            Status       Priority Class
-------- -------------------- ---------------- ------------ -------- ---------
gi1/1/1                       Auto             Fault        low      class4

Every single switch shows faults....even on ports where nothing is plugged in. I can't have every switch replaced. That is insanity. 

[Michal Bruncko]

Hi 

> Another stack has 4 switches and there are 42 ports out of the 192 that show this: 

actually "fault" in that output "show power inline" doesn't mean software or hardware failure. "fault" here means, that switch is unable to detect any powered device connected on that port, which means that no compatible (either IEEE 802.3af PoE or IEEE 802.3at PoE+) device is connected to that particular switchport. but switch is regulairly searching for compatible device which results that status "fault" is should be changing with "searching".