- Inspect thermostat
- Clean or replace 1″ filter
- Inspect heat exchanger
- Inspect temperature rise
- Inspect fan control
- Inspect furnace safety controls
- Inspect for gas leaks
- Inspect gas valve operation
- Inspect ignition system
- Inspect electrical connections
- Inspect gas pressure
- Lubricate all moving parts
- Inspect back-up heat elements
- Inspect sequencer operation
- Inspect amp and volt draw on motors
- Inspect all circuit breakers
- Inspect oil filter
- Inspect defrost control
- Inspect oil nozzle
- Test cycle for proper operation
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