Furnace: Locks out — oil but no ignition
Locks out — oil but no ignition on a furnace: Possible causes and checks for: locks out — oil but no ignition.
Common causes of locks out — oil but no ignition
- Electrodes mispositioned
- Cracked insulators
- Worn/loose/dirty ignition wires
- Transformer/igniter dead
- Primary wires bad
- Low line voltage. No-spark list also: loose wiring, bad transformer, low voltage, cracked insulator, carbonized electrodes, gap too wide/close
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.