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Warm air heating furnace troubleshooting:

How to diagnose & fix hot air furnace heating system problems: hot air or warm air heating system troubleshooting, inspection, diagnosis, and repair.

Diagnosis and correction of NO HEAT or NOT ENOUGH HEAT conditions for warm air or hot air furnace and air duct heating systems. We explain how to recognize and fix common heating system operating or safety defects and how to save money on home heating costs.



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How to Diagnose & Fix Loss of Heat from Hot Air Furnace Systems

Wam air furnace and duct system sketch (C) Carson Dunlop AssocIf your furnace isn't working, what can you fix yourself and what should you check before you call a heating service company? Carson Dunlop Associates' sketch hows the main layout of a basic warm air heating system.

[Click to enlarge any image]

If you don't know whether your heat is provided by a furnace (hot air) or boiler (hot water), or whether your fuel is oil, gas, or electric, and whether your heat is hot water, steam, or warm air,
see HEATING SYSTEM TYPES.

If your heating system uses water or hydronic or hot water or radiator or baseboard hot water heating systems, instead of the article found here you should
see HEATING LOSS DIAGNOSIS - BOILERS.

Note: some hybrid or mixed heating systems combine both hot water and hot air to heat a building, such as water to air systems which use a heating boiler (oil, gas, or electric) to heat water which circulates through (and inside of) a heat exchanger (that looks like a car radiator) - described
at HEATING SYSTEM TYPES.

Check These Items to Diagnose Loss of Warm-Air Heat:

Heaing system emergency switch (C) Daniel Friedman

Step 1: If the furnace oil burner or gas burner is not turning on at all check these points

Step 2: Check the heating fuel supply for the furnace

Step 3: Once you have assured that you have heating fuel and that electrical power is turned on 

If you have power and fuel to the heater, next check these controls

Details of Hot Air Heat Furnace Controls and Switches

For details about the setting, re-setting, or function of the controls and switches commonly found on hot air heating systems
see FURNACE CONTROLS & SWITCHES and

also FURNACE OPERATION DETAILS

Definition of Water to Air Heat Exchanger Heating Systems

Some heating systems combine both hot water and hot air to heat a building, such as water to air systems which use a heating boiler (oil, gas, or electric) to heat water which circulates through (and inside of) a heat exchanger (that looks like a car radiator).

For a detailed guide to inspecting, diagnosing, maintaining & repairing mixed, hybrid, water to air heating systems
see FAN CONVECTOR HEATERS - HYDRONIC COILS

Dual hot water and warm air heating systems: as we explain
at HEATING SYSTEM TYPES, some buildings are heated by a combination of separate hot water systems (circulating hot water through radiating devices like baseboards or radiators in some areas) and hot air systems (circulating warm air through ductwork into the occupied space in other areas).

These buildings will have both a hot air furnace and a completely separate hot water heating boiler installed. In this case these are completely separate heating systems and usually each serves different building areas.

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Continue reading at FAN LIMIT SWITCH - home, or select a topic from closely-related articles below, or see our complete INDEX to RELATED ARTICLES below.

Or see AIR HANDLER / BLOWER UNITS - home

Or see FURNACE CLEARANCE DISTANCES if you are installing a new gas furnace

Or see FURNACE CONTROLS & SWITCHES

Or see FURNACE DIAGNOSTIC CHECKS, GAS for a gas furnace homeowner checklist

Or see HEAT WON'T TURN ON

Or see THERMOSTATS, HEATING / COOLING - home

Suggested citation for this web page

DIAGNOSE & FIX FURNACE PROBLEMS at InspectApedia.com - online encyclopedia of building & environmental inspection, testing, diagnosis, repair, & problem prevention advice.

INDEX to RELATED ARTICLES: ARTICLE INDEX to HEATING FURNACES

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