Hardware Model Specification
Vaillant aroTHERM Split Diagnostics
Classification: HVAC & Boilers Equipment
Hardware operational fault codes, protection alarms, LED blink sequences, and step-by-step diagnostic fixes for the Vaillant aroTHERM Split.
1 Documented Faults
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Full Multimeter & Safety Isolation Procedures
Indexed Fault Codes for aroTHERM Split
Step-by-step resolution manuals and root cause matrices
CODE F.733
Severity: Critical
Difficulty: Advanced
Compressor Inverter Module Fault
Fault F.733 indicates a hardware or commutation failure within the outdoor unit compressor inverter drive. The outdoor unit PCB has detected an overcurrent, phase imbalance, or internal power module (IPM) failure on the variable-speed compressor circuit, triggering a protective safety shutdown.
⏱ 30-45 Mins
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