However, they are supposed to allow air to flow through them into the HVAC unit and, consequently, into the house
It is common for HVAC systems to fail occasionally. This happens when an HVAC component within your HVAC unit breaks down. It can also occur because of electrical reasons. However, before you call an HVAC technician to fix your HVAC system, you should assess your HVAC unit and try to fix simple problems. You should find and fix some issues before calling an HVAC professional, including your HVAC system’s air filters, the thermostat, AC circuit breaker, the outdoor unit’s switch, and the ac drain line. In most cases, the issue could be as simple as a thermostat with outdated batteries. Check your thermostat’s batteries to ensure they have enough energy to power the HVAC component. Open it up and clean it using a clean and dry cloth. After that, you should put it back together and turn it on. Check your AC circuit breaker. The circuit breaker engages when there is a power surge to your HVAC system. Check for any unusual switch position and fix it by returning the breaker’s switch to its correct position. Check your HVAC systems air filter for clogs. Replace all the clogged filters with new units. AN air filter traps dust and debris. However, they are supposed to allow air to flow through them into the HVAC unit and, consequently, into the house. However, when left unattended, they accumulate dirt that clogs them and hinders air flow into the HVAC system. Finally, check your outdoor unit’s switch to ensure it is on. If none of this has caused the fault in your HVAC equipment, you should call an HVAC professional to troubleshoot and fix your HVAC system.
Is there anything I should check prior to calling for an HVAC service?