Change filters if available,checking wiring and connections, clean blower motor air flow ports, lubricate blower motors, check all safety controls, check heat anticipator and adjust if necessary, monitor complete run cycle, check lower limit/high limit/fan limit (gas systems), Check vent pipe for leaks and proper installation (gas system), check air/gas mixture and adjust if necessary (gas systems), Examine burners (gas systems), Examine heat exchangers for leaks or cracks (gas systems), Check gas line at unit for leaks and proper installation (gas systems), Check heat sequencers for proper operation (electric systems), Check breakers or fuses for proper amperage draw (electric system), Check for proper temperature rise (electric system)
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