Assess the causeFollow the evidence.
Identify whether the model uses a mechanical thermostat or electronic sensors and test the relevant control response.
The exact model and operating conditions determine which tests apply. These are possible inspection directions, not a list of components that must be changed.
Before the appointmentKeep the useful details.
Record the current setting and avoid repeated large adjustments while awaiting inspection.
Record the timing, previous work and accessible model label. Do not remove covers or handle live, refrigerant or pressurised components to obtain information.