Assess the causeFollow the evidence.
Inspect the drain route, accessible filter, pump operation and control sequence.
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 displayed code and whether you hear the pump when draining is expected.
Record the timing, previous work and accessible model label. Do not remove covers or handle live, refrigerant or pressurised components to obtain information.