System Status And Error Codes; Reading The Led Flash Sequence - A.O. Smith ProLine XE GPDNL-40 Series Installation And Operating Manual

SYSTEM STATUS AND ERROR CODES

The micro-controller inside the gas control monitors the ignition sequence, temperature settings, and overall operation of
the heater. If any of these parameters does not operate properly the controller will shut down the water heater, diagnose
the failure and flash an error code. The table below lists the System Status Codes for the Honeywell control. Refer to it
and to the "Ignition State And Timing" to diagnose the problem before attempting corrective action.
LED Flash Sequence
Short flash once every four seconds
"Heartbeat", alternates bright/dim
One Flash, three second pause
Two Flash, three second pause
Three Flash, three second pause
Four Flash, three second pause
Five Flash, three second pause
Six-One Flash, three second pause
Six-Two Flash, three second pause
Six-Three Flash, three second pause
Six-Four Flash, three second pause
Seven Flash, three second pause
Eight-One Flash, three second pause
Eight-Two Flash, three second pause
Eight-Three Flash, three second pause
Eight-Four Flash, three second pause
LED continuously "ON"

READING THE LED FLASH SEQUENCE.

The LED indicator light is active when the gas valve/thermostat is in operation. The light will normally show a flash
sequence of a short flash once every four seconds or a "Heartbeat" of alternating bright/dim. Multiple flash codes indicate
an error and can be read as follows:
Example: Corrective Action Number 9, Six-Two Flash, three second pause. For this code, the LED indicator light will
make six bright flashes, pause for one second and then make two more bright flashes. The LED will pause for three
seconds and repeat the six-two cycle of flashes.
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Control Status
IDLE (no call for heat, no fault conditions)
Call For Heat (no fault conditions)
Low Flame Signal (control continues to operate)
Pressure Switch Failed Closed
Pressure Switch Failed Open
ECO (Energy Cut Off) Limit Lockout
thermostat temperature limit was exceeded.
Flame Out Of Sequence
Soft Lockout
- Retry Limit
- Failed Trial For Ignition
Soft Lockout
- Recycle Limit
- Pressure Switch/ High Limit opened
Soft Lockout
- Recycle Limit
- Flame Lost
Soft Lockout
- Flame out of Sequence Sensed
N/A (Flammable Vapour Sensor Lockout)
N/A (Flammable Vapour Sensor Fault Detected)
Temperature Sensor Fault Detected
Electronics Fault Detected
Valve Fault Detected
Hard Lockout
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Corrective
Action
Number
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
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