THERMADOR THERMADOR BUILT-IN REFRIGERATOR (INVERTER COMPRESSOR SYSTEM) General Troubleshooting
System Nominal
A variable-frequency 'hum' that changes pitch shortly after the refrigerator starts is the intended audible signature of an inverter compressor ramping through its programmed RPM range. This frequency-shifting hum is a byproduct of the electronic commutation and indicates the system is successfully modulating cooling capacity to maintain thermal stability.
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