Antminer S19k Pro - Hashrate drop to 0

[clemiax]

Hello !

i'm the happy owner of a brand new Antminer S19k Pro but since almost the beginning (i have it since last week, so never had big period without rebooting yet), sometimes, randomly, the real hashrate is dropping to 0 but no sign of failure on the UI and displayed datas are OK, except Real Hashrate...
Today was the last time it done it, it was running for 8h and then dropped to 0 Th/s.

Here are the logs from the boot until the hashrate drop, i'll be happy to get some help to find the problem (if it's on miner side) and get some tips on what can be done on my end to check potential connector issues or something :

Code:

2026-01-21 00:35:39 ==========================capability start==========================
2026-01-21 00:35:39 board num = 3
2026-01-21 00:35:39 board id = 0, chain num = 1
2026-01-21 00:35:39 	chain id = 0
2026-01-21 00:35:39 board id = 1, chain num = 1
2026-01-21 00:35:39 	chain id = 1
2026-01-21 00:35:39 board id = 2, chain num = 1
2026-01-21 00:35:39 	chain id = 2
2026-01-21 00:35:39 ==========================capability end============================
2026-01-21 00:35:39 chain num = 3
2026-01-21 00:35:42 load chain 0 eeprom data
2026-01-21 00:35:45 load chain 1 eeprom data
2026-01-21 00:35:49 load chain 2 eeprom data
2026-01-21 00:35:49 eeprom load ret:0
2026-01-21 00:35:49 create thread get_nonce_and_register_thread
2026-01-21 00:35:49 fixed working voltage = 1340
2026-01-21 00:35:49 Chain [0] PCB Version: 0x0100
2026-01-21 00:35:49 Chain [0] BOM Version: 0x0000
2026-01-21 00:35:49 Chain [1] PCB Version: 0x0100
2026-01-21 00:35:49 Chain [1] BOM Version: 0x0000
2026-01-21 00:35:49 Chain [2] PCB Version: 0x0100
2026-01-21 00:35:49 Chain [2] BOM Version: 0x0000
2026-01-21 00:35:49 bad chain id = 3
2026-01-21 00:35:49 Fan check passed.
2026-01-21 00:35:49 init fan pid target=55
2026-01-21 00:35:49 max sensor num = 4
2026-01-21 00:35:49 STATUS_INITED: soc init done!
2026-01-21 00:35:49 temperature_monitor_thread start...
2026-01-21 00:35:51 start to init...
2026-01-21 00:35:51 Wait for hashboard cool, please wait, this may take up to 2 minutes...
2026-01-21 00:36:01 Slept 10 seconds, diff = 17.
2026-01-21 00:36:11 Slept 20 seconds, diff = 16.
2026-01-21 00:36:21 Slept 30 seconds, diff = 14.
2026-01-21 00:36:31 Slept 40 seconds, diff = 12.
2026-01-21 00:36:41 Slept 50 seconds, diff = 10.
2026-01-21 00:36:51 Slept 60 seconds, diff = 9.
2026-01-21 00:37:01 Slept 70 seconds, diff = 7.
2026-01-21 00:37:11 Slept 80 seconds, diff = 6.
2026-01-21 00:37:21 Slept 90 seconds, diff = 5.
2026-01-21 00:37:31 Slept 100 seconds, diff = 4.
2026-01-21 00:37:41 Slept 110 seconds, diff = 4.
2026-01-21 00:37:51 Slept 120 seconds, diff = 3.
2026-01-21 00:37:52 start up min temp by 75a = 22, limit -40
2026-01-21 00:37:52 i2c_sim_init start
2026-01-21 00:37:52 i2c_sim_init end
2026-01-21 00:37:54 power open power_version = 0x75
2026-01-21 00:37:58 power is Calibrated
2026-01-21 00:37:58 power sn:DGQG323BEJGJI0756
2026-01-21 00:37:58 enable_power_calibration,calibration date:211208.
2026-01-21 00:37:59 power type version: 0x0075
2026-01-21 00:38:01 disable power watchdog: 0x0000
2026-01-21 00:38:12 set_voltage_by_steps to 1300.
2026-01-21 00:38:14 bad chain id = 3
2026-01-21 00:38:15 set_voltage_by_steps to 1500.
2026-01-21 00:38:23 Chain[0]: find 77 asic, times 0
2026-01-21 00:38:25 Chain[1]: find 77 asic, times 0
2026-01-21 00:38:27 Chain[2]: find 77 asic, times 0
2026-01-21 00:38:32 pulse_mode = 1, ccdly_sel = 0, pwth_sel = 4
2026-01-21 00:38:36 chain_0 set ro ds to 5
2026-01-21 00:38:36 chain_1 set ro ds to 5
2026-01-21 00:38:36 chain_2 set ro ds to 5
2026-01-21 00:38:36 fixed frequency is 590
2026-01-21 00:38:36 Bring up temperature is 22
2026-01-21 00:38:36 set uart relay
2026-01-21 00:38:36 set UART baud to 1000000
2026-01-21 00:38:37 create thread check_miner_status_thread
2026-01-21 00:38:37 create thread check_system_work_thread
2026-01-21 00:38:37 create thread debug_freq_thread
2026-01-21 00:38:37 pulse_mode = 1, ccdly_sel = 0, pwth_sel = 4
2026-01-21 00:38:37 start do_core_reset
2026-01-21 00:38:48 end do_core_reset
2026-01-21 00:38:48 noraml inc freq voltage
2026-01-21 00:38:48 set_voltage_by_steps to 1500.
2026-01-21 00:38:53 Version num 65536
2026-01-21 00:38:53 Mask num 0x1fffe000
2026-01-21 00:38:53 opt_multi_version = 65536, interval timeout = 2620657
2026-01-21 00:38:53 freq = 590, percent = 90, hcn = 4442, timeout = 2620657
2026-01-21 00:38:53 STATUS_JOB_OKAY
2026-01-21 00:39:04 freq 200 waiting board temp to 35,curr temp 23
2026-01-21 00:39:14 freq 200 waiting board temp to 35,curr temp 24
2026-01-21 00:39:24 freq 200 waiting board temp to 35,curr temp 24
2026-01-21 00:39:35 freq 200 waiting board temp to 35,curr temp 25
2026-01-21 00:39:45 freq 200 waiting board temp to 35,curr temp 25
2026-01-21 00:39:55 freq 200 waiting board temp to 35,curr temp 26
2026-01-21 00:40:05 freq 200 waiting board temp to 35,curr temp 26
2026-01-21 00:40:15 freq 200 waiting board temp to 35,curr temp 26
2026-01-21 00:40:26 freq 200 waiting board temp to 35,curr temp 27
2026-01-21 00:40:36 freq 200 waiting board temp to 35,curr temp 27
2026-01-21 00:40:46 freq 200 waiting board temp to 35,curr temp 27
2026-01-21 00:40:56 freq 200 waiting board temp to 35,curr temp 27
2026-01-21 00:41:22 freq 400 waiting board temp to 35,curr temp 27
2026-01-21 00:41:32 freq 400 waiting board temp to 35,curr temp 28
2026-01-21 00:41:42 freq 400 waiting board temp to 35,curr temp 29
2026-01-21 00:41:53 freq 400 waiting board temp to 35,curr temp 30
2026-01-21 00:42:03 freq 400 waiting board temp to 35,curr temp 30
2026-01-21 00:42:13 freq 400 waiting board temp to 35,curr temp 31
2026-01-21 00:42:23 freq 400 waiting board temp to 35,curr temp 31
2026-01-21 00:42:33 freq 400 waiting board temp to 35,curr temp 31
2026-01-21 00:42:43 freq 400 waiting board temp to 35,curr temp 31
2026-01-21 00:42:54 freq 400 waiting board temp to 35,curr temp 32
2026-01-21 00:43:04 freq 400 waiting board temp to 35,curr temp 32
2026-01-21 00:43:14 freq 400 waiting board temp to 35,curr temp 32
2026-01-21 00:43:31 chain[0] get pll config err, times 4
2026-01-21 00:43:37 set_voltage_by_steps to 1480.
2026-01-21 00:43:41 set_voltage_by_steps to 1460.
2026-01-21 00:43:44 set_voltage_by_steps to 1440.
2026-01-21 00:43:48 set_voltage_by_steps to 1420.
2026-01-21 00:43:51 set_voltage_by_steps to 1400.
2026-01-21 00:43:54 set_voltage_by_steps to 1380.
2026-01-21 00:43:58 pulse_mode = 1, ccdly_sel = 0, pwth_sel = 4
2026-01-21 00:43:58 get board temp:33
2026-01-21 00:43:58 waiting board temp come to 35
2026-01-21 00:43:58 waiting board temp to 35,curr temp 33
2026-01-21 00:44:08 waiting board temp to 35,curr temp 34
2026-01-21 00:44:18 waiting board temp to 35,curr temp 34
2026-01-21 00:44:28 waiting board temp to 35,curr temp 34
2026-01-21 00:44:38 waiting board temp to 35,curr temp 34
2026-01-21 00:44:49 waiting board temp to 35,curr temp 34
2026-01-21 00:44:59 waiting board temp to 35,curr temp 34
2026-01-21 00:45:09 waiting board temp to 35,curr temp 34
2026-01-21 00:45:19 waiting board temp to 35,curr temp 34
2026-01-21 00:45:29 waiting board temp to 35,curr temp 34
2026-01-21 00:45:39 waiting board temp to 35,curr temp 34
2026-01-21 00:45:50 waiting board temp to 35,curr temp 34
2026-01-21 00:46:00 get board temp:34
2026-01-21 00:46:16 set voltage to work voltage
2026-01-21 00:46:16 set_voltage_by_steps to 1370.
2026-01-21 00:46:18 set_voltage_by_steps to 1360.
2026-01-21 00:46:20 set_voltage_by_steps to 1350.
2026-01-21 00:46:23 set_voltage_by_steps to 1340.
2026-01-21 00:46:25 create thread check_nonce_status_thread
2026-01-21 00:46:25 create thread power_heart_beat_thread
2026-01-21 00:46:25 Init done!
2026-01-21 00:46:25 STATUS_OKAY
2026-01-21 00:46:25 start the cached job
2026-01-21 00:46:25 set_start_time_point total_tv_start_sys=17519 total_tv_end_sys=17520
2026-01-21 00:46:27 enable power watchdog: 0x0001
2026-01-21 00:50:42 5m later restore pid to 52
2026-01-21 00:54:40 10m later restore pid to 50
2026-01-21 01:16:26 30m avg rate is 122549.45 in 30 mins
2026-01-21 01:46:28 30m avg rate is 121874.34 in 30 mins
2026-01-21 02:16:30 30m avg rate is 121942.67 in 30 mins
2026-01-21 02:26:55 !!! nonce crc error
2026-01-21 02:27:00 chain[1] bad asic num: 6 6 0
2026-01-21 02:27:00 chain[1] asic[5] [162] 766187-766025 [0] 20-20
2026-01-21 02:27:00 chain[2] bad asic num: 6 6 0
2026-01-21 02:27:00 chain[2] asic[5] [179] 767279-767100 [0] 64-64
2026-01-21 02:44:00 !!! reg crc error
2026-01-21 02:44:05 chain[1] bad asic num: 6 6 0
2026-01-21 02:44:05 chain[1] asic[5] [172] 889025-888853 [0] 23-23
2026-01-21 02:44:05 chain[2] bad asic num: 6 6 0
2026-01-21 02:44:05 chain[2] asic[5] [170] 891195-891025 [1] 73-72
2026-01-21 02:46:31 30m avg rate is 122402.32 in 30 mins
2026-01-21 03:16:33 30m avg rate is 121655.29 in 30 mins
2026-01-21 03:46:34 30m avg rate is 122122.06 in 30 mins
2026-01-21 03:48:45 !!! REG_TYPE = 1. 1276136448 asic 8
2026-01-21 03:48:50 chain[1] bad asic num: 6 6 0
2026-01-21 03:48:50 chain[1] asic[5] [187] 1358735-1358548 [0] 35-35
2026-01-21 03:48:50 chain[2] bad asic num: 6 6 0
2026-01-21 03:48:50 chain[2] asic[5] [187] 1360990-1360803 [0] 113-113
2026-01-21 04:16:36 30m avg rate is 122072.65 in 30 mins
2026-01-21 04:46:38 30m avg rate is 122054.33 in 30 mins
2026-01-21 05:16:39 30m avg rate is 122242.87 in 30 mins
2026-01-21 05:46:41 30m avg rate is 121739.32 in 30 mins
2026-01-21 06:16:43 30m avg rate is 122159.28 in 30 mins
2026-01-21 06:46:44 30m avg rate is 122211.24 in 30 mins
2026-01-21 06:56:40 !!! nonce crc error
2026-01-21 06:56:45 chain[1] bad asic num: 6 6 0
2026-01-21 06:56:45 chain[1] asic[5] [167] 2719234-2719067 [0] 77-77
2026-01-21 06:56:46 chain[2] bad asic num: 6 6 0
2026-01-21 06:56:46 chain[2] asic[5] [162] 2722968-2722806 [0] 222-222
2026-01-21 07:16:46 30m avg rate is 122160.50 in 30 mins
2026-01-21 07:46:48 30m avg rate is 122056.16 in 30 mins
2026-01-21 08:16:49 30m avg rate is 121740.54 in 30 mins
2026-01-21 08:46:51 30m avg rate is 122036.64 in 30 mins
2026-01-21 09:15:51 !!! reg crc error
2026-01-21 09:15:56 chain[1] bad asic num: 6 6 0
2026-01-21 09:15:56 chain[1] asic[5] [179] 3727907-3727728 [0] 99-99
2026-01-21 09:15:56 chain[2] bad asic num: 6 6 0
2026-01-21 09:15:56 chain[2] asic[5] [153] 3729756-3729603 [0] 297-297
2026-01-21 09:16:52 30m avg rate is 122705.38 in 30 mins
2026-01-21 09:38:11 chain[1] bad asic num: 6 6 0
2026-01-21 09:38:11 chain[1] asic[5] [178] 3889044-3888866 [0] 105-105
2026-01-21 09:38:11 chain[2] bad asic num: 6 6 0
2026-01-21 09:38:11 chain[2] asic[5] [153] 3891252-3891099 [0] 306-306
2026-01-21 09:46:54 30m avg rate is 122003.67 in 30 mins
2026-01-21 09:49:35 curr_vol2 = 1340, g_voltage = 1340,entrance_temp = 17
2026-01-21 09:49:35 set_voltage_by_steps to 1350.
2026-01-21 09:49:37 set_voltage_by_steps to 1366.
2026-01-21 09:49:40 curr_vol2 = 1366, g_voltage = 1340,entrance_temp = 11
2026-01-21 09:49:40 set_voltage_by_steps to 1376.
2026-01-21 09:49:45 curr_vol2 = 1376, g_voltage = 1340,entrance_temp = 11
2026-01-21 09:49:45 set_voltage_by_steps to 1386.
2026-01-21 09:49:48 curr_vol2 = 1386, g_voltage = 1340,entrance_temp = 11
2026-01-21 09:49:48 set_voltage_by_steps to 1396.
2026-01-21 09:49:50 curr_vol2 = 1396, g_voltage = 1340,entrance_temp = 11
2026-01-21 09:49:50 set_voltage_by_steps to 1406.
2026-01-21 09:49:53 set_voltage_by_steps to 1418.
2026-01-21 09:50:28 set_voltage_by_steps to 1408.
2026-01-21 10:01:55 chain 0 hash rate 6466.00 low in 15 mins
2026-01-21 10:01:55 chain 1 hash rate 6598.00 low in 15 mins
2026-01-21 10:01:55 chain 2 hash rate 6481.00 low in 15 mins
2026-01-21 10:16:56 avg rate is lower than ideal rate, 9772.96 in 30 mins
2026-01-21 10:16:56 30m avg rate is 9772.96 in 30 mins
2026-01-21 10:16:56 chain 0 hash rate 0.00 low in 15 mins
2026-01-21 10:16:56 chain 1 hash rate 0.00 low in 15 mins
2026-01-21 10:16:56 chain 2 hash rate 0.00 low in 15 mins
2026-01-21 10:33:10 ****power off hashboard****
2026-01-21 10:33:10 power off

##### I REBOOTED THE MINER HERE ######

[BitMaxz]

Have you tried to check if the power supply is providing stable power? If you are using an extension, try plugging the unit directly into the wall outlet and observe if still dropping. Take note, this unit was built to run at 220v; if your power source is 110v, this won't run normally.

You are getting some crc error and pointing to a bad ASICs there are many possible cause by these errors. You'd better try the basic things first before considering that these two hashboard defective.

Do some software first before touching anything related to hardware. I suggest try to restore to the factory default.
If the issue persist try the SD card flashing and then upgrade it to the latest firmware.

If it didn't fix your issue, try running the unit with Braiins OS and then test it again, check the logs, because sometimes Braiins OS bypasses these few ASIC issues.

If it runs normally without rebooting, then you can continue using it, but if it shows some errors in the logs and you want to fix those issues, try replugging all cables from the control board to the hashboard, which is a data cable. You can also try to clean the plugs and terminals and test it again.

If not, of these works since it's brand new, you can send them back to Bitmain for repair or replacement.

[clemiax]

Have you tried to check if the power supply is providing stable power? If you are using an extension, try plugging the unit directly into the wall outlet and observe if still dropping. Take note, this unit was built to run at 220v; if your power source is 110v, this won't run normally.

You are getting some crc error and pointing to a bad ASICs there are many possible cause by these errors. You'd better try the basic things first before considering that these two hashboard defective.

Do some software first before touching anything related to hardware. I suggest try to restore to the factory default.
If the issue persist try the SD card flashing and then upgrade it to the latest firmware.

If it didn't fix your issue, try running the unit with Braiins OS and then test it again, check the logs, because sometimes Braiins OS bypasses these few ASIC issues.

If it runs normally without rebooting, then you can continue using it, but if it shows some errors in the logs and you want to fix those issues, try replugging all cables from the control board to the hashboard, which is a data cable. You can also try to clean the plugs and terminals and test it again.

If not, of these works since it's brand new, you can send them back to Bitmain for repair or replacement.

Thanks for your answer.

Currently, both PSU cables are plugged directly into the wall, they are just plug in 2 zigbee connected socket who should support +3000W and 230v (for power usage tracking) which is plugged into the wall socket, that's the only difference but maybe it can interfere ?
Thanks for the tips, i will try to do the softwares things like the reset factory and for the flashing sadly my s19k pro don't have SD card port, only micro usb so i can't test other OS without flashing directly and risking warranty because of replacing Bitmain firmware so not great... or maybe buying a new controller but idk how it works for that.

and if still present will try to plug everything again

Thanks !
i'll keep the post updated

[BitMaxz]

Thanks for your answer.

Currently, both PSU cables are plugged directly into the wall, they are just plug in 2 zigbee connected socket who should support +3000W and 230v (for power usage tracking) which is plugged into the wall socket, that's the only difference but maybe it can interfere ?
Thanks for the tips, i will try to do the softwares things like the reset factory and for the flashing sadly my s19k pro don't have SD card port, only micro usb so i can't test other OS without flashing directly and risking warranty because of replacing Bitmain firmware so not great... or maybe buying a new controller but idk how it works for that.

and if still present will try to plug everything again

Thanks !
i'll keep the post updated

Actually, the firmware you are going to flash is the official firmware from Bitmain since the Braiins OS does not support this unit for flashing via SD card.
If your unit only has a micro USB, then you'll need a micro SD card reader to connect it to your unit.

Use the firmware from the link below

- https://www.zeusbtc.com/firmware-download/details/4878-sd-card-firmware-download-for-antminer-19-series

Those firmwares are official firmware from Bitmain, and it won't break the warranty unless you flash it with unauthorized firmware like Braiins. But my suggestion for Braiins OS is to boot it, not to flash the unit just to try the unit if it works or not, and to know other hints under Braiins logs.

I don't know why you come up buying a controller if you don't want to break the warranty?

[clemiax]

Thanks for your answer.

Currently, both PSU cables are plugged directly into the wall, they are just plug in 2 zigbee connected socket who should support +3000W and 230v (for power usage tracking) which is plugged into the wall socket, that's the only difference but maybe it can interfere ?
Thanks for the tips, i will try to do the softwares things like the reset factory and for the flashing sadly my s19k pro don't have SD card port, only micro usb so i can't test other OS without flashing directly and risking warranty because of replacing Bitmain firmware so not great... or maybe buying a new controller but idk how it works for that.

and if still present will try to plug everything again

Thanks !
i'll keep the post updated

Actually, the firmware you are going to flash is the official firmware from Bitmain since the Braiins OS does not support this unit for flashing via SD card.
If your unit only has a micro USB, then you'll need a micro SD card reader to connect it to your unit.

Use the firmware from the link below

- https://www.zeusbtc.com/firmware-download/details/4878-sd-card-firmware-download-for-antminer-19-series

Those firmwares are official firmware from Bitmain, and it won't break the warranty unless you flash it with unauthorized firmware like Braiins. But my suggestion for Braiins OS is to boot it, not to flash the unit just to try the unit if it works or not, and to know other hints under Braiins logs.

I don't know why you come up buying a controller if you don't want to break the warranty?

Hello,

i'm currently on firmware "FR-1.28(251010-S19k Pro)", i heard there is some restriction with recent firmware.
You mean i need to buy a micro-USB OTG adapter to try to install the SD firmware by using the micro SD port ?

[BitMaxz]

Hello,

i'm currently on firmware "FR-1.28(251010-S19k Pro)", i heard there is some restriction with recent firmware.
You mean i need to buy a micro-USB OTG adapter to try to install the SD firmware by using the micro SD port ?

Yes, that's exactly what I mean since you said that it doesn't have an SD card slot and it has a micro usb then use that to communicate with the unit. You can use an OTG adapter

You can either flash the original or stock firmware or boot a different OS, as I said, Braiins OS won't flash to NAND, but you can boot the Braiins via OTG adapter and micro SD card reader.

[clemiax]

Hello,

i'm currently on firmware "FR-1.28(251010-S19k Pro)", i heard there is some restriction with recent firmware.
You mean i need to buy a micro-USB OTG adapter to try to install the SD firmware by using the micro SD port ?

Yes, that's exactly what I mean since you said that it doesn't have an SD card slot and it has a micro usb then use that to communicate with the unit. You can use an OTG adapter

You can either flash the original or stock firmware or boot a different OS, as I said, Braiins OS won't flash to NAND, but you can boot the Braiins via OTG adapter and micro SD card reader.

Alright!

So if i got it well, i flash the FR1.28 with the OTG adapter to the "AML-19k-Pro-202311151447-sd-card" and from here, i will "theoretically" be able to flash a custom firmware ?
I saw VNISH firmware can works better than Braiins OS for NAND systems, any tips on that ?

Thanks!

[BitMaxz]

Alright!

So if i got it well, i flash the FR1.28 with the OTG adapter to the "AML-19k-Pro-202311151447-sd-card" and from here, i will "theoretically" be able to flash a custom firmware ?
I saw VNISH firmware can works better than Braiins OS for NAND systems, any tips on that ?

Thanks!

It depends on the custom firmware if it supports the current version of your unit, but I don't recommend flashing it with custom firmware if you care about the warranty.
About which one is better for me, both of them perform well; you can test both of them.