Page 8
TABLE 3
1/4” Quick Connect Terminals
120HUM Humidier 120VAC
LINE 120VAC
XFMR Transformer 120VAC
CIRC Indoor blower 120VAC
EAC Indoor air quality accessory 120VAC
NEUTRALS Common 120VAC
HUM24 Humidier 24VAC
3/16” Quick Connect Terminals
COOL Cooling tap 24VAC
HEAT Heating tap 24VAC
FAN Continuous blower 24 VAC
PARK
(no power)
Park terminal for speed taps
FS Flame sense
24 COM Common 24VAC
TABLE 4
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
Notes
Note - 1 A ”Heartbeat” is indicated by a ”Slow Flash” - 1 sec on 1 sec o, repeating
Note - 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.
Note - 3
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.
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