Mitsubishi Electric EA Error Code
Miswiring of indoor/outdoor unit connecting wire, excessive number of indoor units (4 units or more)
Source: hvac/mitsubishi-electric/75011a04__SH_SUZ-KA24_36NAHZ_OCH754D.pdf
What does Mitsubishi Electric EA mean?
EA, detected when power is turned on, indicates miswiring of the indoor/outdoor connecting wire or an excessive number of indoor units (four or more) connected. At startup the outdoor unit checks the connecting wiring and the connected indoor units; incorrect wiring or too many indoor units sets EA. This is an installation/wiring fault identified during the power-on check, not a refrigerant problem.
Symptoms
- EA shown at power-on
- System will not start after installation
- Fault appears right after wiring changes
- Outdoor unit rejects the connected configuration
Common causes
- Miswired indoor/outdoor connecting wires
- Too many indoor units connected (four or more)
- Wrong terminals used for the connecting wires
- Crossed connections between indoor units
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Diagnostic steps
Power down all units
Switch off the indoor and outdoor units before checking the wiring.
Verify the connecting wiring
Confirm each indoor/outdoor connecting wire is on the correct terminals.
Count the indoor units
Check that the number of connected indoor units is within the allowed limit.
Correct any miswiring
Reterminate any crossed or misplaced connecting wires per the wiring diagram.
Restart and confirm
Restore power and check whether EA clears at the next power-on.
When to call a professional
Call a qualified installer for EA, since correcting connecting-wire miswiring or an over-connected system must follow the wiring diagram and system limits. Verifying terminals and the indoor-unit count is mains-voltage work that requires the installation data. A professional should confirm the configuration and rewire it correctly before the system is energized again.
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Other Mitsubishi Electric Error Codes
Abnormal high pressure (63H worked)
Abnormal high discharge temperature, shortage of refrigerant
Open/short circuit of discharge thermistor (TH4)(TH33)
Open/short of outdoor unit thermistors (TH3, TH32, TH6, TH7 and TH8)
Abnormal temperature of heatsink
Abnormality of power module
Abnormality of superheat due to low discharge temperature
Abnormality in outdoor fan motor
Overheat protection
Abnormal pressure of 63HS
Compressor overcurrent interruption (When Comp. locked)
Current sensor error