Assess the causeFollow the evidence.
Check tank level detection, automatic shut-off, inlet valve, pressure controls and the purification flow path.
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.
Observe whether the storage tank fills and whether the noise or reject flow stops at any point.
Record the timing, previous work and accessible model label. Do not remove covers or handle live, refrigerant or pressurised components to obtain information.