GSW 6G40NAV - TROUBLESHOOTING GUIDELINES; SYSTEM STATUS AND ERROR CODES; READING THE LED FLASH SEQUENCE

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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 fl ash 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 Control Status
Corrective
Action
Number
Short fl ash once every four seconds IDLE (no call for heat, no fault conditions) 1
“Heartbeat”, alternates bright/dim Call For Heat (no fault conditions) 2
One Flash, three second pause Low Flame Signal (control continues to operate) 3
Two Flash, three second pause Pressure Switch Failed Closed 4
Three Flash, three second pause Pressure Switch Failed Open 5
Four Flash, three second pause
ECO (Energy Cut Off) Limit Lockout
thermostat temperature limit was exceeded.
6
Five Flash, three second pause Flame Out Of Sequence 7
Six-One Flash, three second pause
Soft Lockout
- Retry Limit
- Failed Trial For Ignition
8
Six-Two Flash, three second pause
Soft Lockout
- Recycle Limit
- Pressure Switch/ High Limit opened
9
Six-Three Flash, three second pause
Soft Lockout
- Recycle Limit
- Flame Lost
10
Six-Four Flash, three second pause
Soft Lockout
- Flame out of Sequence Sensed
11
Seven Flash, three second pause N/A (Flammable Vapour Sensor Lockout) 12
Eight-One Flash, three second pause N/A (Flammable Vapour Sensor Fault Detected) 13
Eight-Two Flash, three second pause Temperature Sensor Fault Detected 14
Eight-Three Flash, three second pause Electronics Fault Detected 15
Eight-Four Flash, three second pause Valve Fault Detected 16
LED continuously “ON” Hard Lockout 17
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
fl ash sequence of a short fl ash once every four seconds
or a “Heartbeat” of alternating bright/dim. Multiple fl ash
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 fl ashes, pause for one second and
then make two more bright fl ashes. The LED will pause
for three seconds and repeat the six-two cycle of fl ashes.