100299634_2000545244_ Rev. A
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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 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
Control Status
Corrective
Action
Number
Short flash 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 Vapor Sensor Lockout)
12
Eight-One Flash, three second pause
N/A (Flammable Vapor 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 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.
