Gas Furnace Maintenance Checklist

Fall tune-up checklist: safeties, ignition, flame sensor microamps, gas pressure, venting, temperature rise and CO.

Shut off gas and power before opening the burner area. Confirm gas pressures against the rating plate and installation instructions.

Saves on this device as you type. Nothing is sent to us.

Job

CompanyTechnicianDateCustomerAddress

Equipment

Indoor model / serialOutdoor model / serialRefrigerant / gas type

Start-up and safeties

Thermostat calls for heat; sequence of operation normal
Stored fault codes checked and recorded
Fault codes found	code
Inducer runs quietly; pressure switch closes
Pressure switch hose and port clear
High limit and rollout switches in place and closed
Door switch works

Ignition and flame

Igniter inspected (no cracks); resistance checkedHot surface
Igniter resistance	Ω
Flame sensor signal	µA DC
Flame sensor cleaned if low
Burners clean, aligned, flame carries over
Flame is blue and steady, not lifting or rolling out

Gas and combustion

Inlet gas pressure	in. w.c.
Manifold pressure (low fire)	in. w.c.
Manifold pressure (high fire)	in. w.c.
No gas leaks at the valve and fittings (leak test)
CO in flue (air-free)See the combustion analysis log	ppm
CO at the supply register / ambient	ppm

Venting and condensate

Vent pipe sloped, supported and sealed; termination clear
Combustion air intake clear (direct vent)
Condensate trap and drain clean; no leaks (high efficiency)
Heat exchanger inspected where visible; no cracks or rust-through

Airflow and electrical

Return air temperature	°F
Supply air temperature	°F
Temperature rise (rated range on plate)	°F
Total external static pressure	in. w.c.
Filter replaced; blower clean
Blower amps	A
Supply voltage	V
Polarity and ground correct

Notes and recommendations

Technician signatureCustomer signature

More checklists

FORM

AC / heat pump maintenance

Spring tune-up checklist with electrical, refrigerant, airflow and drain checks and spaces for every reading.

FORM

Heat pump heating check

Heating-mode checks: reversing valve, defrost, auxiliary heat, outdoor coil clearance and heating performance.

FORM

Mini-split maintenance

Indoor head cleaning, blower wheel, drain, flare joints, outdoor coil and operating readings for each zone.

FORM

Startup / commissioning

New install sign-off: pressure test, evacuation, charge, airflow, electrical and customer walkthrough on one sheet.

General good practice for field reference. The equipment manufacturer's instructions and local code always come first. Suggest an improvement: hello@hvaccheatsheet.com.

HVAC Cheat Sheet · Free PT charts, code lookups and calculators for techs at hvaccheatsheet.com