Furnace: Unsatisfactory heat (short cycles / uneven / not enough)
Unsatisfactory heat (short cycles / uneven / not enough) on a furnace: Possible causes and checks for: unsatisfactory heat (short cycles / uneven / not enough).
Common causes of unsatisfactory heat (short cycles / uneven / not enough)
- Faulty thermostat
- Faulty limit
- Flame sensor low µA
- Open auxiliary limit
- Wrong heat-anticipator setting
- Improper airflow/distribution
- Bad thermostat location
How to fix unsatisfactory heat (short cycles / uneven / not enough): step by step
- Test thermostat
- Test limit
- Test flame sensor
- Manual reset
- Check anticipator setting
- Check duct static (see A34)
- Relocate thermostat
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.