508096-01 Issue 2037 Page 11 of 34
Red LED Flash Code
2
Diagnostic Codes / Status of Furnace
O 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 ame during heat demand
4 Low Flame Signal - check ame sensor
5 Watchguard - burner failed to light, exceeded maximum number of retries or recycles
6 Not Used
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
1 A ”Heartbeat” is indicated by a ”Slow Flash” - 1 sec on 1 sec o, repeating
2 Error codes are indicated by a ”Rapid Flash” - the LED ashes X times at 1/2 sec on 1/2 sec o, remains o for 3 sec, then repeats
NOTE: Last 10 error codes are stored in memory including when power is shut o to the unit. - To recall, press and release button,
most recent will be displayed rst, LED o for 3 sec, then next error code is displayed, etc. To clear error codes, depress and
hold button longer than 5 seconds.
Table 5. -03 Control Diagnostic Codes
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