507769C05 Page 39 of 55
Red LED Flash Code
2
Diagnostic Codes / Status of Furnace
O No power to control or control hardware fault detected
Heartbeat
1
Normal operation - idle, continuous fan, cool
Continuous Rapid Flash Call for heat / burner operation
1 Flash Reverse line voltage polarity
2 Flashes Improper earth ground
3 Flashes Burner failed to light, or lost ame during heat demand
4 Flashes Low ame signal - check ame sensor
5 Flashes Watchguard - burner failed to light, exceeded maximum number of retries or recycles
6 Flashes Not used
7 Flashes Primary or Secondary limit open or watchguard mode - limit switch open longer than 3 minutes
8 Flashes Rollout switch open
9 Flashes Pressure switch failed to close or opened during heat demand
10 Flashes Watchguard - Pressure switch opened 5 times during one heat demand
11 Flashes Pressure switch stuck closed prior to activation of combustion air inducer
12 Flashes Flame sensed without gas valve energized
13 Flashes Low line voltage
1
A “heartbeat” is indicated by a “slow ash” - 1 sec on 1 sec o, repeating
2
Error codes are indicated by a “rapid ash” - 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 sec.
Table 12. Diagnostic Codes for 103217-03 Control
Red LED Flash Code
2
Diagnostic Codes / Status of Furnace
O No power to control or control hardware fault detected
On Board Fault Detected
Fast Heartbeat
3
Call for Heat / Burner Operation
Slow Heartbeat
1
Normal Operation – Idle, Continuous Fan, or Cool
1 Flash
2
Reverse Line Voltage Polarity or Phasing of 120V power
2 Flashes
2
Improper earth ground
3 Flashes
2
Burner failed to light, or lost ame during heat demand
4 Flashes
2
Low ame signal - check ame sensor
5 Flashes
2
Watchguard – burner failed to light, exceeded maximum number of retries/recycles, 1 hour lockout
6 Flashes
2
Not used
7 Flashes
2
Primary or Secondary limit switch open or Watchguard mode – Limit Switch open longer than 3 minutes
8 Flashes
2
Rollout switch open
9 Flashes
2
Pressure switch failed to close or opened during heat demand
10 Flashes
2
Watchguard - Pressure switch opened 5 times during one heat demand
11 Flashes
2
Pressure switch stuck closed prior to activation of combustion air inducer
12 Flashes
2
Flame sensed without gas valve energized
13 Flashes
2
Low line voltage
1
A slow heartbeat is indicated by 1 sec on / 1 sec o. It is used for idle, continuous fan and cool modes.
2
Error codes are indicated by a “rapid ash” - the LED ashes X times at 1/2 sec on / 1/2 sec o, remains o for 2 sec, then repeats.
3
A fast heartbeat is indicated by 1/2 sec on / 1/2 sec o. It is only used during a heat call.
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 sec.
Table 13. Diagnostic Codes for 107163-01 Control
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