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TABLE 4
RED LED
Flash Code
2
Diagnostic Codes / Status of Furnace
Off
No power to control or board fault detected
Heartbeat
1
Normal Operation - Idle, Continuous Fan, Cool
Continuous Rapid Flash
Call For Heat / Burner Operation
1
Reverse Line Voltage Polarity
2
Improper Earth Ground
3
Burner failed to light, or lost flame during heat demand
4
Low Flame Signal - check flame sensor
5
Watchguard - burner failed to light, exceeded maximum number of retries or recycles.
6
Ignitor Circuit Failure - not available on this control
7
Primary or Secondary Limit Open or Watchguard Mode - Limit Switch Open longer than 3 minutes
8
Rollout Switch Open
9
Pressure Switch failed to close or opened during heat demand
10
Watchguard - Pressure Switch opened 5 times during one heat demand
11
Pressure Switch stuck closed prior to activation of combustion air inducer
12
Flame Sensed without gas valve energized
13
Low Line Voltage
Notes
Note 1
A ”Heartbeat” is indicated by a ”Slow Flash” - 1 sec on 1 sec off, repeating
Note 2
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.
Note 3
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.
