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P6 Troubleshooting
Digital display output
Description
▪ 1P6 indicates compressor A inverter module protection.
▪ 2P6 indicates compressor B inverter module protection.
▪ When a P6 error occurs, a manual system restart is required before the system can resume operation. The cause of a
P6 error should be addressed promptly in order to avoid system damage.
▪ All units stop running.
▪ Error code is displayed on the main PCB and user interface.
Possible causes
▪ Inverter module protection.
▪ DC bus low or high voltage protection.
▪ MCE error.
▪ Zero speed protection.
▪ Phase sequence error.
▪ Excessive compressor frequency variation.
▪ Actual compressor frequency differs from target frequency.
Specific error codes for xH4 inverter module protection
If a P6 error code is displayed, press button SW3 (to No.36 item) until one of the following specific error codes is displayed
on the digital display: xL0, xL1, xL2, xL4, xL5, xL7, xL8, xL9. Refer to Figure 5-4.3 and Table 5-4.1.
Figure 4-4.1: Button SW3 on main PCB
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Table of Contents
Troubleshooting
Summary of Contents for Midea P6
- Page 1 Specific error codes for xH4 inverter module protection If a P6 error code is displayed, press button SW3 (to No.36 item) until one of the following specific error codes is displayed on the digital display: xL0, xL1, xL2, xL4, xL5, xL7, xL8, xL9. Refer to Figure 5-4.3 and Table 5-4.1.
- Page 2 Table 4-4.1: Specific error codes for error xH4 Specific error code Content Inverter module protection DC bus low voltage protection DC bus high voltage protection MCE error Zero speed protection Phase sequence error Compressor frequency variation greater than 15Hz within one second protection Actual compressor frequency differs from target frequency by more than 15Hz protection Notes: 'x' is a placeholder for the compressor system (compressor and related electrical components), with 1 representing compressor system A and...
- Page 3 First troubleshooting step To troubleshoot XP6 errors, first ensure that the DC bus wire is connected correctly. The DC bus wire should run from the N terminal on the inverter module, through the current sensor (in the direction indicated by the arrow on the current sensor), and end at the N terminal on the DC filter board.
- Page 4 Figure 4-4.6: Inverter module terminals P1 N1 xL1/xL4 troubleshooting Step 1: Check inverter module ▪ Check the DC voltage between terminals P and N. The normal value is 510-580V. If the voltage is lower than 510V, go to Step 2. Figure 4-4.7: Inverter module terminals Step 2: Check rectifier wiring circuit ▪...
- Page 5 xL2 troubleshooting Step 1: Check inverter module ▪ Check the DC voltage between terminals P and N. The normal value is 510-580V, if the voltage is higher than 580V, go to Step 2. Figure 4-4.9: Inverter module terminals Step 2: Check inverter module ▪...
- Page 6 control box can be used to determine whether the xL8/xL9 error is being caused by a compressor fault or a main PCB fault: If using another unit in the same system as the unit with the error to perform the test, set it as the master unit (address 0);...
- Page 7 ▪ If the oil drained from the faulty compressor is clean, go to Step 6. ▪ If the oil drained from the faulty compressor is only lightly spoiled, go to Step 4. ▪ If the oil drained from the faulty compressor is heavily spoiled, check the oil in the other compressors in the system. Drain the oil from any compressors where the oil has been spoiled.
- Page 8 Cloudy or gray oil indicates abnormal system This oil contains operation particles of copper...
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