Lennox EL195UH040NE36B Installation Instructions And Use page 42

RED LED
Flash Code
2
Off
Heartbeat
1
Continuous Rapid Flash
1
2
3
4
5
6
7
8
9
10
11
12
13
Note - 1
Note - 2
Note - 3
TABLE 11
Diagnostic Codes / Status of Furnace
No power to control or board fault detected
Normal Operation - Idle, Continuous Fan, Cool
Call For Heat / Burner Operation
Reverse Line Voltage Polarity
Improper Earth Ground
Burner failed to light, or lost flame during heat demand
Low Flame Signal - check flame sensor
Watchguard - burner failed to light, exceeded maximum number of retries or
recycles.
Not Used
Primary or Secondary Limit Open or Watchguard Mode - Limit Switch Open longer
than 3 minutes
Rollout Switch Open
Pressure Switch failed to close or opened during heat demand
Watchguard - Pressure Switch opened 5 times during one heat demand
Pressure Switch stuck closed prior to activation of combustion air inducer
Flame Sensed without gas valve energized
Low Line Voltage
Notes
A "Heartbeat" is indicated by a "Slow Flash" - 1 sec on 1 sec off, repeating
Error codes are indicated by a "rapid flash" - the LED flashes X times at ½ second on ½
second off, remains off for 3 seconds then repeats.
Last 10 error codes are stored in memory including when power is shut off to the
unit. - To recall, press and release button, most recent will be displayed first, LED off for 3
sec, then next error code is displayed, etc. To clear error codes, depress and hold button
longer than 5 seconds.
Page 42