Furnace: High fuel consumption
High fuel consumption on a furnace: Possible causes and checks for: high fuel consumption.
Common causes of high fuel consumption
- Worn/loose nozzle
- Dirty chamber
- Too much combustion air
- Poor mixing
- Low overfire draft
- Air leaks into chamber
- Wrong oil pressure
- Overfiring (high stack temp)
If the unit shows an error code, look it up: AirQuest Furnace codes Carrier Furnace codes Daikin Furnace codes Goodman Furnace codes ICP Furnace codes KeepRite Furnace codes Lennox Furnace codes Midea Furnace codes Rheem Furnace codes Trane Furnace codes York Furnace codes
Source: General HVAC service practice — verify per model. Written in our own words as a summary; always check the original manual.
General guidance for qualified technicians. The manufacturer's installation and service manual and local codes always take priority. Aurora Star Tech is not affiliated with, endorsed by or sponsored by any equipment manufacturer; brand and model names are used only to identify equipment and belong to their owners.