My S21+ device has a problem. It can only mine for about 5 minutes. After that, it stops mining.

- I tried updating the firmware.

- I tried changing the Pool.

- I tried switching the Hashboard cable.

(Switching 2-3 times, it still shows the Board 0 error.)

- I tried buying a new control board to try to replace it, but the problem is still the same.


It's a new machine that I bought about 3 months ago, but I just started using it and it still can't dig for me. Does anyone have any advice or the correct cause of the problem for me?

I think I'll have to send it for repair but in case there is a solution.

===========================================Miner log===========================================
2025-06-19 09:11:23 [INFO_] commit version: 6eae4985e2fdb7f57d8220024fe3763f6a54647f 2025-04-22 15:03:49, build by: jenkins 2025-04-22 15:23:42
2025-06-19 09:11:23 [INFO_] platform[AML]
2025-06-19 09:11:23 [INFO_] miner type[Antminer S21+] firmware type[Release] compile time[Tue Apr 22 15:05:57 CST 2025]
2025-06-19 09:11:23 [INFO_] firmware version[FR-1.15(250422-S21+)]
2025-06-19 09:11:23 [INFO_] MAC[02:85:65:DB:66:4B]
2025-06-19 09:11:23 [INFO_] work mode[NEM_MODE]
2025-06-19 09:11:31 [INFO_] power version[0x00c1] sn[KLKT335BEJAAG1084] calibrated[true] c_date[211208]
2025-06-19 09:11:31 [INFO_] framework init success
2025-06-19 09:11:31 [INFO_] power init success
2025-06-19 09:11:31 [INFO_] fan init success
2025-06-19 09:11:32 [INFO_] temp init success
2025-06-19 09:11:32 [INFO_] kill all hashboard
2025-06-19 09:11:32 [INFO_] start to check network
2025-06-19 09:11:48 [INFO_] cooling the boards, please wait, this may take up to 5 minutes...
2025-06-19 09:13:33 [INFO_] bring up temperature[36.50] diff[3.00]
2025-06-19 09:13:40 [INFO_] hashboard power on
2025-06-19 09:13:41 [INFO_] board[0]: asic num[55] times[0]
2025-06-19 09:13:41 [INFO_] board[1]: asic num[55] times[0]
2025-06-19 09:13:42 [INFO_] board[2]: asic num[55] times[0]
2025-06-19 09:16:16 [ERROR] board[0] rate[89.39] less than limit[95.00]
2025-06-19 09:16:16 [INFO_] kill all hashboard
2025-06-19 09:16:17 [ERROR] S21+ setup err
2025-06-19 09:16:17 [ERROR] ---[S21PT1_MINER_SETUP_ERR]
2025-06-19 09:16:17 [ERROR] -------[S21PT1_CONFIGURE_ASIC_ERR]
2025-06-19 09:16:17 [ERROR] -----------[S21PT1_EXECUTE_FREQ_BOOST_ERR]
2025-06-19 09:16:17 [ERROR] ---------------[S21PT1_FREQ_UP_ERR]
2025-06-19 09:16:17 [ERROR] -------------------[FREQ_UP_V1_SET_FREQ_STEP_UP_OPERATION_ERR]
2025-06-19 09:16:17 [ERROR] -----------------------[S21PT1_VOLTAGE_ADJUST_ERR]
2025-06-19 09:16:17 [ERROR] ---------------------------[S21PT1_FREQ_UP_RATE_TOO_LOW_ERR]