Hardware Model Specification
Mitsubishi Electric Ecodan R290 Monobloc (PUZ-WZ / PUHA Series) Diagnostics
Classification: HVAC & Heat Pumps Equipment
Hardware operational fault codes, protection alarms, LED blink sequences, and step-by-step diagnostic fixes for the Mitsubishi Electric Ecodan R290 Monobloc (PUZ-WZ / PUHA Series).
1 Documented Faults
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Full Multimeter & Safety Isolation Procedures
Indexed Fault Codes for Ecodan R290 Monobloc (PUZ-WZ / PUHA Series)
Step-by-step resolution manuals and root cause matrices
CODE U6
Severity: Critical
Difficulty: Advanced
Compressor Overcurrent Lockout
Error U6 designates an outdoor unit compressor overcurrent trip. The inverter driver circuit detected current exceeding safe operational thresholds (typically >20-28A peak depending on chassis size) across the DC bus or U/V/W output phases, tripping the Intelligent Power Module (IPM) protection lockout.
⏱ 45-75 Mins
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