1. Clean thermocouple terminals.

2. Clean the heat exchanger, ensure the spacing of the fins, and inspect the condition of the heat exchanger.

3. Disassemble the fan, clean accumulated soot and debris.

4. Disassemble the Venturi pipe and clean it.

Check the gasket at the fan outlet and replace if necessary.

6. Inspect the cleanliness of the micro-pressure relay's intake pressure tube; clean if necessary.

7. Clean the soot and dust from the coaxial flue; ensure the密封 integrity of both the internal and external flues during installation.

Note: If a component needs to be disassembled during cleaning, replace the seal ring upon reinstallation.