- Inspect and brush-clean evaporator coil, if needed**
- Lubricate fan motors*
- Inspect unit disconnect
- Monitor expansion valve
- Check start and run capacitors
- Clean condenser coil, if needed
- Clean evaporator drain**
- Check start and run relays
- Check sequencer
- Check thermostat
- Monitor refrigerant level
- Inspect reversing valve (hp)
- Clean or Inspect filters
- Check fuses
- Test defrost cycle (hp)
- Tighten electrical connections
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- Measure voltage & amperage
- Check crankcase heater (hp)
- Test safety controls Inspect blower components**
- Check flue pipe (gas)
- Measure temperature differential
- Clean and adjust burners (gas)
- Clean heat exchanger & combustion chamber (gas)
- Evaluate condenser surroundings
- Check heat exchanger for cracks (gas)
- Test for poisonous carbon monoxide (gas)
- Check ductwork condition & joints
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- Test thermocouple (gas)
- Monitor flue draft (gas)
- Check fan blades for tightness
- Monitor gas pressure-adjust if needed (gas)
- Clean flame sensor (gas)
- Check auxilliary heat strips (hp)
- Clean & adjust ignition or pilot (gas)
- Examine gas lines (gas)
- Check fan relay
- Check combustion air (gas)
- Test heating elements
- Inspect unit wiring
- Record temperatures
- Written evaluation & recommendations
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