HVACopediaLennox · Furnace
Red LED fast flash (heartbeat) Call for heat - burner operation
What the display is showing
The red LED blinks quickly while a heat call is being served. On control 107163-01 the fast heartbeat is about half a second on and half a second off and is used only during a heat call. On control 103217-03 the manual calls it a continuous rapid flash. It differs from an error code, which flashes a number of times and then pauses for 3 seconds.
Applies to: EL195UHNE furnaces with ignition control 103217-03 or 107163-01 (red LED)
Settings for these units
Filter sizes (filter rack kits) · Lennox EL195UHNE
| Cabinet | Horizontal end rack | Side return rack |
|---|---|---|
| B width (040, 060) | 18 x 25 x 1 (kit 87L96) | 16 x 25 x 1 (kit 44J22) |
| C width (080, 100) | 20 x 25 x 1 (kit 87L97) | 16 x 25 x 1 (kit 44J22) |
Filters are field supplied; check monthly.
100NE60C over 1800 cfm with single side return needs a 20 x 25 x 1 filter via return air base and transition.
Models that show this code
4 models in Lennox EL195UHNE
Other codes on the same units
- 10 flashes Watchguard - pressure switch opened 5 times in one heat demand
- 11 flashes Pressure switch stuck closed before inducer starts
- 12 flashes Flame sensed with gas valve off
- 13 flashes Low line voltage
- Red LED off No power to control or board fault
- Red LED on steady Board fault detected (107163-01)
- Red LED recall button Error recall button on the ignition control
- Red LED slow flash (heartbeat) Normal - idle, continuous fan or cooling
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Source: Lennox EL195UHNE Unit Information Corp 1801-L1 (rev 04/2024), Table 4 (103217-03) / Table 5 (107163-01) diagnostic codes, p.8-10. Summarized in our own words; check the original manual for your model.
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.