Soft lockout: retries ran out and no flame current was sensed.
Homeowner part this code names: furnace flame sensor.
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Lennox E270 is a soft lockout after the maximum retries, with no flame current sensed. It clears when a heat call finishes successfully. The row says to check gas flow, that the ignitor is lighting the burner, and flame sensor current. It is not E223, the pressure switch, and not E200, the rollout lockout.
Likely causes
- No flame current sensed on the last retries
- Gas flow problem
- Ignitor not lighting the burner
Safe checks for E270
- Confirm the manual gas shutoff serving the furnace is open, and that another gas appliance in the house still lights. If nothing gas lights, call the gas supplier from outside
- Technicianconfirm the ignitor is lighting the burner and check flame-sensor current. The code clears when a heat call finishes successfully
Capacitors can hold a charge after the power is off. Safety terms.
When to call a pro
E270 is the retry lockout for no flame current. It is not E223 (pressure switch) and not E200 (rollout). If the gas is on and it will not finish a heat call, call a licensed HVAC technician.
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Parts & tools for this fix
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Furnace flame sensor: guide
In this code: No flame current sensed on the last retries
See the guide for what to look for when buying one.
Nut driver set: guide
In this code: Panels and parts on a furnace are held by hex-head screws; a nut driver grips them without stripping.
See the guide for what to look for when buying one.