Lennox
E270 / 7-flash
LockoutIgnition lockout
Max retries, no flame current (7-seg) or ignition lockout (flash).
Walk E270 / 7-flash in Diagnose
Sign in for the next measurement
First check
1 Measure µA while it is running
Do not clean first and guess. Series-µA the rod on Lennox SL280 during a call. Falling µA is oxide, ground, or a dying flame. A hard drop is often the pressure switch or limit opening, not the rod. Watch a try. HSI, gas, rod. If E271 / 6-flash stores, draft died — go back to the vent.
Expect: Typically ≥ 1.0 µA DC on this family — confirm the door card. Rising while running.
The rest of the walkthrough is Diagnose.
On the plates
- Watch a try. HSI, gas, rod. If E271 / 6-flash stores, draft died — go back to the vent.