Upon arrival, I inspected the system and found that the filter was indeed clogged, which was causing operational issues. I explained the situation to the customer and demonstrated how to replace the filter. The customer followed my instructions and successfully replaced the filter, resolving the issue. During our conversation, I discovered that the customer was unaware of the scheduled service visit. I ensured they understood the importance of regular maintenance and provided information on how to schedule future visits. The system is now functioning correctly, and the customer is well-informed about the maintenance process.