What It Means
- Low flame current - Run mode.
- SLP98UHV, SLP99UHV: Low flame current - Run mode - Refer to troubleshooting in installation instruction.
Lennox Ducted Heating
Lennox Error Code E240
Ducted Heating
E240 means different things on different Ducted Heating models. Enter your model number to see only your reading, or find your model below.
Causes & actions from Lennox
Low flame current - Run mode.
24 models
EL180UHNE(K), EL195UHNEK, EL195UHNEK-01, EL195UHNEK-02, EL196UHEK, EL280UHE(X), EL280UHEK, EL280UHEK(X), EL296UHE, EL297UHEK, ML180UHVK, ML193DFEK, ML196UHEK, ML296UHVK, ML297UH045XV36BK, ML297UH070XV36BK, ML297UH090XV36CK, ML297UH090XV60CK, ML297UH110XV60CK, ML297UH135XV60DK, ML297UHVK, SL280DFNV, SL280UHV, SL297UHNV
Gas furnace (indoor)
How it shows
- Integrated control 7-segment display: E240
Check micro-amperes of flame sensor using control diagnostics or field-installed mode. Clean or replace sensor. Measure voltage of neutral to ground to ensure good unit ground. Alert clears after current heat call has been completed.
Other manual wording (1 of 9)
EL280UHEK, EL280UHEK(X), EL297UHEK
Check micro-amperes of flame sensor using control diagnos- tics or field-installed mode. Clean or replace sensor. Mea- sure voltage of neutral to ground to ensure good unit ground. Alert clears after current heat call has been completed. See TABLE 11 for flame signal.
Other manual wording (2 of 9)
ML296UHVK, ML297UH045XV36BK, ML297UH070XV36BK, ML297UH090XV36CK, ML297UH090XV60CK, ML297UH110XV60CK, ML297UH135XV60DK, ML297UHVK
Check micro-amperes of flame sensor using control diagnos- tics or field-installed mode. Clean or replace sensor. Mea- sure voltage of neutral to ground to ensure good unit ground. Alert clears after current heat call has been completed. See TABLE 27 for flame signal.
Other manual wording (3 of 9)
ML196UHEK
Check micro-amperes of flame sensor using control diagnostics or field- installed mode. Clean or replace sensor. Measure voltage of neutral to ground to ensure good unit ground. Alert clears after current heat call has been completed. See FIGURE 9 for flame signal.
Other manual wording (4 of 9)
EL195UHNEK, EL195UHNEK-01, EL195UHNEK-02
Check micro-amperes of flame sensor using control diagnostics or field- installed mode. Clean or replace sensor. Measure voltage of neutral to ground to ensure good unit ground. Alert clears after current heat call has been completed. See TABLE 6 for flame signal.
Other manual wording (5 of 9)
ML180UHVK
Check micro-amperes of flame sensor using control diagnostics or field-installed mode. Clean or replace sensor. Measure voltage of neutral to ground to ensure good unit ground. Alert clears after current heat call has been completed. See TABLE 12 for flame signal.
Other manual wording (6 of 9)
EL180UHNE(K)
Check micro-amperes of flame sensor using control diagnostics or field-installed mode. Clean or replace sensor. Measure voltage of neutral to ground to ensure good unit ground. Alert clears after current heat call has been completed. See TABLE 18 for flame signal.
Other manual wording (7 of 9)
ML196UHEK
Check micro-amperes of flame sensor using control diagnostics or field-installed mode. Clean or replace sensor. Measure voltage of neutral to ground to ensure good unit ground. Alert clears after current heat call has been completed. See TABLE 21 for flame signal.
Other manual wording (8 of 9)
EL196UHEK
Check micro-amperes of flame sensor using control diagnostics or field-installed mode. Clean or replace sensor. Measure voltage of neutral to ground to ensure good unit ground. Alert clears after current heat call has been completed. See TABLE 23 for flame signal.
Other manual wording (9 of 9)
ML193DFEK
Check micro-amperes of flame sensor using control diagnostics or field-installed mode. Clean or replace sensor. Measure voltage of neutral to ground to ensure good unit ground. Alert clears after current heat call has been completed. See TABLE 25 for flame signal.
Applicable models & manual sources
- EL280UHE(X)
Low flame current - Run mode.
- EL296UHE
Low flame current - Run mode.
- SL280DFNV
Low flame current - Run mode.
- SL280UHV
Low flame current - Run mode.
- SL297UHNV
Low flame current - Run mode.
- EL280UHEK
Low flame current - Run mode.
EL280UHEK, EL280UHEK(X)
- EL297UHEK
Low flame current - Run mode.
- ML296UHVK
Low flame current - Run mode.
- ML297UH045XV36BK
Low flame current - Run mode.
ML297UH045XV36BK, ML297UH070XV36BK, ML297UH090XV36CK, ML297UH090XV60CK, ML297UH110XV60CK, ML297UH135XV60DK, ML297UHVK
- ML196UHEK
Low flame current - Run mode.
- EL195UHNEK
Low flame current - Run mode.
EL195UHNEK, EL195UHNEK-01, EL195UHNEK-02
- ML180UHVK
Low flame current - Run mode.
- EL180UHNE(K)
Low flame current - Run mode.
- ML196UHEK
Low flame current - Run mode.
- EL196UHEK
Low flame current - Run mode.
- ML193DFEK
Low flame current - Run mode.
Low flame current - Run mode - Refer to troubleshooting in installation instruction.
Models: SLP98UHV, SLP99UHV
How it shows
- Integrated control 7-segment display: E240
Check micro amperes of flame sensor, clean or replace sensor. Measure voltage of neutral to ground for good unit ground.
Applicable models & manual sources
- SLP98UHV
Low flame current − Run mode − Refer to troubleshooting in installation instruction.
- SLP99UHV
Low flame current - Run mode - Refer to troubleshooting in installation instruction.
Disclaimer: This information is for general reference. Code wording and instructions vary by model. Always follow the service manual for your exact unit.
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