Hardware Model Specification
Vaillant aroTHERM plus VWL 125/6 A Diagnostics
Classification: HVAC & Heat Pumps Equipment
Hardware operational fault codes, protection alarms, LED blink sequences, and step-by-step diagnostic fixes for the Vaillant aroTHERM plus VWL 125/6 A.
1 Documented Faults
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Full Multimeter & Safety Isolation Procedures
Indexed Fault Codes for aroTHERM plus VWL 125/6 A
Step-by-step resolution manuals and root cause matrices
CODE F.733
Severity: Critical
Difficulty: Advanced
Compressor Motor Phase Disconnection
The inverter PCB detects a loss of current feedback or an open circuit across one of the three motor drive phases (U, V, W) supplying the hermetic scroll compressor, triggering an immediate shutdown to prevent IPM driver destruction and unbalance stress.
⏱ 45-60 Mins
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