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Deep Technical Chapters · Electrical, Controls & Commissioning
Fault Finding
Technician
The repeatable diagnostic method applied across the system — gather, read, theorise, test, prove, verify.
Fault finding is the diagnostic method in action. See The Diagnostic Method and the Six Diagnostic Categories for the framework; this chapter applies it across common faults.
Common fault signatures
- Low charge, restriction, bad TXV, compressor faults
- Condenser and evaporator faults
- Defrost failures and ice build-up
- Control and safety faults
