Diagnostic Maintenance Plan Check List

Gas Furnace

• Heat Exchanger
• Inlet Pressure R A
• Manifold Pressure R A
• Gas Line
• Gas Shutoff Valve
• Burners
• Flame Sensor R A
• Igniter (Resistance: ohms)
• Ignition Control
• Inducer Motor
• Inducer Assembly
• Combustion Blower & Assembly
• Vacuum Switches
• Circuit Board
• Safety Switches
• Blower Motor
• Blower Capacitor R A
• Blower Amps R A
• Blower Wheel
• Electrical Connections
• Drain Line

Thermostat

• Overall Condition
• Wiring Connections
• Location
• Level
• Battery Condition

Air Quality

• Ductwork Condition (Ex. Static inwg)
• Filter Type
• Location
• Air Temperature SA RA WB
• Temperature Difference

Airflow

• Airflow Volume CFM

Air Handler

• Blower Motor
• Blower Wheel
• Blower Capacitor R A
• Blower Amps R A
• Heat Strips
• Sequencers
• Control Board
• Safety Switches
• Electrical Connections

Condensing Unit AC HP

• Model #
• Serial #
• Condenser Coil
• Fan Capacitor R A
• Compressor Run Capacitor R A
• Compressor Start Capacitor R A
• Contactor
• Fan Motor
• Fan Blade
• Fan Motor Amps R A
• Compressor Amps LRA RLA
• Drain Holes
• Electrical Connections
• Disconnect
• Defrost Cycle (HP Only)
• Reversing Valve (HP Only)
• Accumulator (HP Only)
• Charging Ports
• Refrigerant Type
• Hi Lo
• Superheat Subcool

AC Cased Coil (could be part of AH)

• Evaporator Coil
• Drain Line
• Drain Pan