HVACopediaLennox · Furnace
E229 Ignition on high fire
What the control is telling you
Control switched to high-fire ignition because the low-fire pressure switch did not close in time. Informational.
Applies to: EL296UHV(X) series furnaces (integrated control 103130-XX and 107045-XX)
Likely causes
- Low supply voltage
- Low outdoor temperature
- Marginal low-fire pressure differential
Test and repair steps
- No repair is required for this code by itself.
- Sequence if the low-fire switch does not close, the inducer goes to high, the high-fire switch closes after the 15 s pre-purge and the furnace lights on high fire, switching to low fire after 10-20 seconds.
- If it repeats often, check line voltage (97-132 VAC hot to neutral) and supply voltage under load.
- Check the vent system and condensate drainage, and measure low-fire pressure switch differential against the set-point tables.
Settings for these units
Recommended filter size by cabinet width · EL296UHV
| Cabinet width | Side return | Bottom return |
|---|---|---|
| 17-1/2 in. | 16 x 25 x 1 in. (1) | 16 x 25 x 1 in. (1) |
| 21 in. | 16 x 25 x 1 in. (1) | 20 x 25 x 1 in. (1) |
| 24-1/2 in. | 16 x 25 x 1 in. (2) | 24 x 25 x 1 in. (1) |
Number in brackets is the quantity of filters.
Filters are field supplied and installed outside the furnace; inspect monthly.
Recommended filter size by cabinet width · Lennox SL280UHV
| Cabinet width | Side return | Bottom return |
|---|---|---|
| 14-1/2 in. | 16 x 25 x 1 in. (1) | 14 x 25 x 1 in. (1) |
| 17-1/2 in. | 16 x 25 x 1 in. (1) | 16 x 25 x 1 in. (1) |
| 21 in. | 16 x 25 x 1 in. (1) | 20 x 25 x 1 in. (1) |
| 24-1/2 in. | 16 x 25 x 1 in. (2) | 24 x 25 x 1 in. (1) |
Number in brackets is filter quantity; filters are field supplied.
Never run the unit without a filter installed.
- Filter sizes by cabinet width · Lennox SL297NV
Models that show this code
22 models in EL296UHV, Lennox SL280UHV, Lennox SL297NV
Other codes on the same units
- E225 High pressure switch failed open
- E226 High pressure switch failed closed
- E227 Low pressure switch opened during ignition or run
- E228 Inducer calibration failure
- E240 Low flame current (run mode)
- E241 Flame sensed out of sequence - flame present
- E250 Limit switch circuit open
- E252 Discharge air temperature too high
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Source: Lennox EL296UHV(X) Unit Information / Service Literature, Table 5 Ignition Control 103130-XX Diagnostic Codes, p.35; Ignition Control 107045-XX Diagnostic Codes table, p.42, Wiring and Sequence of Operation p.93. Summarized in our own words; check the original manual for your model.
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For licensed technicians. Gas, electrical and refrigerant work must be done by a qualified, licensed person. Shut off power and gas before servicing, never bypass a safety control, and follow the manufacturer’s manual for the exact model; it and local codes always take priority. HVACopedia is not affiliated with any manufacturer; brand and model names only identify the equipment.