AvalonMiner 1166 with one hashboard disconnected

[invicta]

Hi - looking for assistance with this please. Got an AvalonMiner 1166Pro here, works fine with all 3 boards. Deliberately disconnected one of the boards as the wall socket was getting too hot for my liking and wanted to draw less power so thought 2/3 would be fine. Miner seems to get stuck in reboot loop after 5 minutes. There was one time where it went green and continued mining on 2/3 boards as planned but hasn't done it again since. The log isn't very helpful compared to the Antminers so no idea what it's actually doing behind the scenes. Can anyone advise on how to resolve this please - basically looking to override and make it run on 2/3 boards only, there is no faulty board and it's fully working (eg didn't buy a junk parts miner). Thanks in advance

[BitMaxz]

Please post the logs here so that we can check them for you, what is going on behind your unit or if you want to learn how to read and troubleshoot it on your own you can download the guide from this link below under manual then troubleshoot

- https://www.canaan.io/service/447

Also, check the pool where you mine, and maybe the issue is related to the pool server if you have unstable internet or high ping the miner will stop.

[invicta]

Please post the logs here so that we can check them for you, what is going on behind your unit or if you want to learn how to read and troubleshoot it on your own you can download the guide from this link below under manual then troubleshoot

- https://www.canaan.io/service/447

Also, check the pool where you mine, and maybe the issue is related to the pool server if you have unstable internet or high ping the miner will stop.

I had BOOTBY = 0x04 after I restarted it from the dashboard, now it's 0x11.

{'STATUS':[{'STATUS':'S','When':90,'Code':11,'Msg':'Summary','Description':'cgminer 4.11.1'}],'SUMMARY':[{'Elapsed':82,'MHS av':0.00,'MHS 30s':0.00,'MHS 1m':0.00,'MHS 5m':0.00,'MHS 15m':0.00,'Found Blocks':0,'Getworks':12,'Accepted':0,'Rejected':0,'Hardware Errors':0,'Utility':0.00,'Discarded':1056910,'Stale':0,'Get Failures':0,'Local Work':4,'Remote Failures':0,'Network Blocks':1,'Total MH':0.0000,'Work Utility':0.00,'Difficulty Accepted':0.00000000,'Difficulty Rejected':0.00000000,'Difficulty Stale':0.00000000,'Best Share':0,'Device Hardware%':0.0000,'Device Rejected%':0.0000,'Pool Rejected%':0.0000,'Pool Stale%':0.0000,'Last getwork':0}
{'STATUS':[{'STATUS':'S','When':90,'Code':70,'Msg':'CGMiner stats','Description':'cgminer 4.11.1'}],'STATS':[{'STATS':0,'ID':'AVA100','Elapsed':82,'Calls':0,'Wait':0.000000,'Max':0.000000,'Min':99999999.000000,'MM ID0':'Ver[1166Pro-68-21042001_4ec6bb0_61407fa] DNA[02010000ac7c7134] MEMFREE[1221984.0] NETFAIL[0 0 0 0 0 0 0 0] SYSTEMSTATU[Work: In Work, Hash Board: 2 ] Elapsed[110] BOOTBY[0x11.00000000] LW[0] MH[0 0 0] HW[0] DH[0.000%] Temp[22] TMax[22] TAvg[22] Fan1[5198] Fan2[5144] Fan3[5109] Fan4[5127] FanR[68%] Vo[345] PS[0 1224 1381 151 2085 1380] PLL0[0 0 0 0] PLL1[0 0 0 0] PLL2[0 0 0 0] GHSspd[0.00] DHspd[0.000%] GHSmm[0.00] GHSavg[0.00] WU[0.00] Freq[0.00] Led[0] MGHS[0.00 0.00 0.00] MTmax[-273 -273 -273] MTavg[0 0 0] TA[240] Core[A3201] PING[0] POWS[0] HASHS[0 0 0] POOLS[0] SoftOFF[0] ECHU[1 1 1] ECMM[1] SF0[480 500 520 540] SF1[480 500 520 540] SF2[480 500 520 540] PVT_T0[-273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273] PVT_T1[-273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273] PVT_T2[-273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273 -273] PVT_V0[0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0] PVT_V1[0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0] PVT_V2[0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0] MW[0 0 0] MW0[0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0] MW1[0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0] MW2[0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0] ASICCRC0[0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0] ASICCRC1[0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0] ASICCRC2[0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0] CRC[0 0 0] POW_I2C[OK] FACOPTS0[] FACOPTS1[] ATAOPTS0[--avalon10-freq 384:404:424:444 --avalon10-voltage-level 87 ] ATAOPTS1[--avalon10-freq 480:500:520:540 --avalon10-voltage-level 70 ] ADJ[1] COP[0 0 0] MPO[3200] MVL[87] ATABD0[480 500 520 540] ATABD1[480 500 520 540] ATABD2[480 500 520 540] WORKMODE[1]','MM Count':1,'Smart Speed':1,'Voltage Level Offset':0,'Nonce Mask':25}

Is there a method to get this to run with 2 boards out of 3, it did it once but it hasn't since.
Also, what is the 'Aging' setting in FMS?

[BitMaxz]

0x11 is no hashrate in 5 minutes.
Focus on these two logs ECHU[1 1 1] ECMM[1] it seems the hashboard is detected but it's not communicating properly to the control board.
Would you mind to check the conductive copper sheet if you screw them well or do I think you need to try to remove the copper sheet and clean it with isopropyl alcohol and use sandpaper to clean the terminals reassemble and test it again? Make sure that you fix the screw properly to make sure it powers up these two hashboard.

I don't think Aging can fix this issue and aging is only use to autotune the unit.

[invicta]

0x11 is no hashrate in 5 minutes.
Focus on these two logs ECHU[1 1 1] ECMM[1] it seems the hashboard is detected but it's not communicating properly to the control board.
Would you mind to check the conductive copper sheet if you screw them well or do I think you need to try to remove the copper sheet and clean it with isopropyl alcohol and use sandpaper to clean the terminals reassemble and test it again? Make sure that you fix the screw properly to make sure it powers up these two hashboard.

I don't think Aging can fix this issue and aging is only use to autotune the unit.

While I wrote this back, I got an answer from Canaan support who have been helping but think they are leading me the wrong way with this particular unit. They told me this 1166Pro-68 cannot run with 2 boards as it's not designed to, so deliberately disconnecting it causes this issue (but ignored that it has worked once previously and never again) - they supplied some software and told me to use 'Power Mode 4' so I can run it at 64% but FMS can set it which makes me think it's for 12 and 13 series miners.

I reattached the middle board (H2) and the miner works fine and normally, no issues (log attached bottom of message) - so I don't think there is a comms error on the other two boards:

"{'STATUS':[{'STATUS':'S','When':2377,'Code':11,'Msg':'Summary','Description':'cgminer 4.11.1'}],'SUMMARY':[{'Elapsed':2391,'MHS av':60506172.09,'MHS 30s':69097908.75,'MHS 1m':67784187.78,'MHS 5m':61727236.83,'MHS 15m':58085348.01,'Found Blocks':0,'Getworks':93,'Accepted':1025,'Rejected':2,'Hardware Errors':1,'Utility':25.72,'Discarded':6682178,'Stale':0,'Get Failures':0,'Local Work':33608,'Remote Failures':0,'Network Blocks':7,'Total MH':144267633222.0000,'Work Utility':845621.90,'Difficulty Accepted':31464127.00000000,'Difficulty Rejected':104282.00000000,'Difficulty Stale':0.00000000,'Best Share':73724256,'Device Hardware%':0.0000,'Device Rejected%':0.3095,'Pool Rejected%':0.3303,'Pool Stale%':0.0000,'Last getwork':0}
{'STATUS':[{'STATUS':'S','When':2377,'Code':70,'Msg':'CGMiner stats','Description':'cgminer 4.11.1'}],'STATS':[{'STATS':0,'ID':'AVA100','Elapsed':2391,'Calls':0,'Wait':0.000000,'Max':0.000000,'Min':99999999.000000,'MM ID0':'Ver[1166Pro-68-21072802_4ec6bb0_211fc46] DNA[02010000ac7c7134] MEMFREE[1193208.0] NETFAIL[0 0 0 0 0 0 0 0] SYSTEMSTATU[Work: In Work, Hash Board: 3 ] Elapsed[2391] BOOTBY[0x05.00000000] LW[2339498] MH[0 1 0] HW[1] DH[25.408%] Temp[30] TMax[77] TAvg[66] Fan1[4243] Fan2[4248] Fan3[4128] Fan4[4128] FanR[63%] Vo[349] PS[0 1224 1396 229 3208 1400 3503] PLL0[9333 831 737 3019] PLL1[9596 1123 917 2284] PLL2[9101 911 785 3123] GHSspd[46797.44] DHspd[37.143%] GHSmm[76548.96] GHSavg[60500.36] WU[845180.23] Freq[458.27] Led[0] MGHS[20377.93 20169.24 19953.19] MTmax[77 73 77] MTavg[65 64 67] TA[360] Core[A3201] PING[46] POWS[0] HASHS[0 0 0] POOLS[0] SoftOFF[0] ECHU[0 0 0] ECMM[0] SF0[448 468 488 508] SF1[448 468 488 508] SF2[448 468 488 508] PVT_T0[ 66 70 68 69 71 68 66 70 74 69 74 69 69 71 72 74 69 67 74 71 77 77 72 71 68 73 76 72 68 67 69 69 75 74 69 68 68 67 76 75 68 67 64 65 70 64 65 62 63 63 64 62 62 63 66 61 62 59 60 61 52 59 53 58 60 59 60 63 62 60 63 61 62 64 60 60 66 64 64 66 62 64 64 66 63 66 61 61 68 66 64 65 61 64 67 65 66 66 65 67 70 69 64 66 64 65 65 65 65 65 63 63 64 66 64 65 64 60 66 71] PVT_T1[ 66 70 66 66 69 67 66 69 64 67 69 67 62 69 67 69 68 64 67 72 71 72 68 64 64 67 72 72 69 68 66 71 70 68 71 64 62 72 73 73 65 66 63 66 69 66 67 64 64 64 65 64 64 64 58 62 64 62 60 60 56 61 55 60 60 57 58 63 59 59 62 61 62 62 59 63 64 63 65 62 60 59 65 65 64 64 61 59 64 64 65 64 63 64 66 68 64 65 63 63 65 67 64 67 62 62 63 65 63 65 61 64 63 62 64 64 66 63 67 68] PVT_T2[ 67 70 67 69 71 69 66 73 73 73 71 69 72 72 72 70 77 66 71 75 75 72 76 72 69 72 68 69 72 72 70 70 66 71 68 71 70 72 72 76 74 69 66 66 71 69 65 69 65 67 68 69 69 62 69 63 62 62 64 64 61 58 54 59 60 59 61 60 62 64 67 64 63 73 64 64 68 66 66 67 64 65 68 66 66 65 69 65 65 68 65 66 67 64 69 65 66 67 65 69 71 69 67 67 69 69 65 65 66 67 70 67 67 68 68 69 65 64 66 69] PVT_V0[319 321 325 321 326 323 328 329 334 321 321 322 327 324 327 319 321 322 327 325 325 311 310 306 318 318 319 296 295 305 327 329 327 317 317 321 325 325 324 322 326 323 329 328 329 326 326 327 321 322 318 324 321 322 327 324 326 323 324 325 331 326 329 323 327 328 334 334 334 333 331 327 330 327 333 330 329 328 326 327 325 335 334 333 330 330 327 329 327 322 325 321 320 334 333 335 325 325 329 317 317 319 326 326 330 334 331 330 329 329 328 324 325 327 326 325 327 328 329 332] PVT_V1[322 327 332 331 334 334 324 322 327 323 326 326 327 326 330 309 320 324 322 325 331 329 330 330 318 314 317 331 329 329 321 323 319 316 305 311 323 327 325 298 304 307 315 314 302 326 318 313 322 323 325 326 328 326 325 322 328 331 334 338 338 334 331 328 325 327 336 340 335 324 330 331 327 331 335 323 326 326 322 320 318 330 326 329 330 332 331 329 327 326 318 319 316 334 331 327 330 327 332 315 314 318 327 331 332 322 326 325 334 334 333 328 325 323 335 333 329 321 320 326] PVT_V2[325 326 331 330 331 330 330 326 331 333 333 334 328 330 315 317 306 309 313 314 319 325 330 327 319 316 319 301 302 305 318 322 326 308 313 310 321 322 324 327 327 330 318 320 321 329 333 333 316 315 313 331 329 331 319 328 327 319 319 327 332 327 326 330 323 328 329 324 318 329 329 329 329 326 332 331 329 328 331 331 331 330 329 329 326 325 322 335 333 330 330 327 331 328 332 331 334 330 334 328 327 323 322 325 316 334 334 334 312 314 319 327 327 328 325 323 327 329 333 337] MW[783488 783535 783453] MW0[42 46 59 62 46 44 50 48 51 46 32 49 36 60 64 30 48 39 45 51 48 43 45 51 49 45 57 42 50 57 35 55 37 34 35 39 41 42 34 35 42 55 65 53 48 47 51 41 49 35 46 42 36 64 56 45 44 44 46 38 62 58 52 53 43 54 49 44 57 54 38 62 42 44 43 51 46 52 50 47 45 63 50 42 38 61 52 37 50 59 41 39 58 43 39 54 48 58 48 48 50 47 46 39 51 56 49 47 35 40 45 43 37 58 42 38 48 42 51 52] MW1[53 49 42 51 49 49 63 44 50 56 53 43 45 45 52 41 55 43 43 53 43 59 55 45 38 50 41 59 46 52 40 49 42 45 50 31 40 45 44 51 23 31 44 44 49 37 54 46 41 44 60 50 44 46 37 36 43 45 45 47 70 49 40 46 46 38 42 50 48 36 48 38 61 52 45 55 38 53 44 43 42 40 56 43 52 48 57 44 50 47 38 47 44 34 49 41 39 47 52 54 38 34 50 38 46 60 40 49 56 54 51 46 39 39 73 59 49 45 58 38] MW2[48 45 44 41 59 48 56 50 43 48 50 47 58 51 40 50 44 52 34 34 24 46 55 43 43 51 43 54 29 43 34 47 48 37 43 52 46 45 36 34 52 35 46 47 53 49 41 37 46 55 45 48 36 45 57 44 53 36 52 36 55 47 45 49 42 55 50 49 49 49 54 45 53 45 54 45 44 46 43 41 52 37 45 34 36 63 42 37 51 40 60 54 45 48 42 47 44 43 44 56 46 66 42 46 45 35 51 54 53 44 31 40 51 44 58 43 61 56 46 46] ASICCRC0[0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0] ASICCRC1[0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0] ASICCRC2[0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0] CRC[0 0 0] POW_I2C[OK] FACOPTS0[] FACOPTS1[] ATAOPTS0[] ATAOPTS1[] ADJ[0] Bar[24%] COP[0 0 0] MPO[3200] MVL[87] ATABD0[0 0 0 0] ATABD1[0 0 0 0] ATABD2[0 0 0 0] WORKMODE[0]','MM Count':1,'Smart Speed':1,'Voltage Level Offset':0,'Nonce Mask':25}"

[BitMaxz]

While I wrote this back, I got an answer from Canaan support who have been helping but think they are leading me the wrong way with this particular unit. They told me this 1166Pro-68 cannot run with 2 boards as it's not designed to, so deliberately disconnecting it causes this issue (but ignored that it has worked once previously and never again) - they supplied some software and told me to use 'Power Mode 4' so I can run it at 64% but FMS can set it which makes me think it's for 12 and 13 series miners.

I reattached the middle board (H2) and the miner works fine and normally, no issues (log attached bottom of message) - so I don't think there is a comms error on the other two boards:

If that's what they said then you can't run this unit with only two hashboard. I don't know about power mode 4 using the FMS app you can only find two options there under switch mode "normal mode and high performance mode" There is no power mode 4 on the FMS app you can maybe try to send a command to adjust the power to these two hashboard check the command below and send this command using FMS app under diagnose and don't forget to replace 1260 below and test if it would work with only 2 hashboard.

Code:

[{"command":"ascset", "parameter":"0,hashpower,1260"}]

If you don't have any other choice then run the 3 hashboards but you would need to replace your wall outlet that support 20a or above.

[invicta]

While I wrote this back, I got an answer from Canaan support who have been helping but think they are leading me the wrong way with this particular unit. They told me this 1166Pro-68 cannot run with 2 boards as it's not designed to, so deliberately disconnecting it causes this issue (but ignored that it has worked once previously and never again) - they supplied some software and told me to use 'Power Mode 4' so I can run it at 64% but FMS can set it which makes me think it's for 12 and 13 series miners.

I reattached the middle board (H2) and the miner works fine and normally, no issues (log attached bottom of message) - so I don't think there is a comms error on the other two boards:

If that's what they said then you can't run this unit with only two hashboard. I don't know about power mode 4 using the FMS app you can only find two options there under switch mode "normal mode and high performance mode" There is no power mode 4 on the FMS app you can maybe try to send a command to adjust the power to these two hashboard check the command below and send this command using FMS app under diagnose and don't forget to replace 1260 below and test if it would work with only 2 hashboard.

Code:

[{"command":"ascset", "parameter":"0,hashpower,1260"}]

If you don't have any other choice then run the 3 hashboards but you would need to replace your wall outlet that support 20a or above.

To be honest, they told me a lot of different things and got the impression they weren't listening to me properly. FMS 2.3.3 is the one on their site, they told me to do the firmware update in AvalonBuddy which they sent through and then when I told them FMS didn't have Power Mode, they sent me a newer FMS 2.3.5 which does have that setting but gets this error when attempting to set:

"ip 192.168.0.240 error result:
ASC 0 set failed: Unknown option: power-level-set"

What does that hashpower command you have provided do? Is that a cgminer command for the 'diagnose' part of FMS?

I have all 3 hashboards connected again now in Normal mode which gets around 60-61TH average, but the cable gets slightly warm, the socket gets warm/hot and the plug pins are too hot to hold onto - not that concerning but over time might get too hot and can't risk it. I should add that I'm in the UK so I am using 240V with 13A fuses in the plug and the sockets are rated for 13-14A max and 20A per dual socket in a modern office with recent electrical renovations so it should be better spec than residential.

I will try your command later (can you explain what it is meant to do please)? If there is a way to limit the frequency of the ASICs or max voltage that would also have the same effect I imagine as long as it sets and takes hold permanently. Is there any way of injecting a command to cgminer when the miner controller board boots?