508031-02Issue 2135Page 8 of 29
Red LED Flash Code
2
Diagnostic Codes / Status of Furnace
O No power to control or board fault detected
Heartbeat
1
Control powered - displayed during all modes of operation if no errors are detected
Continuous Rapid Flash Call For Heat / Burner Operation
1 ash Reverse line voltage polarity
2 ashes Improper earth ground
3 ashes Burner failed to light, or lost ame during heating demand
4 ashes Low ame signal - check ame sensor
5 ashes Watchguard - burner failed to light, exceeded maximum number or retries or recycles
6 ashes Control detected igniter circuit failure. Not available on all controls.
7 ashes Primary or secondary limit open or Watchguard mode - limit switch open longer than 3 minutes
8 ashes Rollout switch open
9 ashes Pressure switch failed to close of opened during heat demand
10 ashes Watchguard - pressure switch opened 5 times during one heat demand
11 ashes Pressure switch stuck closed prior to activation or combustion air inducer
12 ashes Flame sensed without gas valve energized
13 ashes 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 ash” - the LED ashes X times at ½ second on ½ second o, remains o for 3 seconds then
repeats.
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 4. Diagnostic Codes
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