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System Status And Error Codes
The micro-controller inside the gas control monitors the flammable vapor safety features, 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 following table lists the System Status Codes for the Honeywell control. Refer to it and to
the "Trouble Shooting Checklist" to diagnose the problem before attempting corrective action. See also
"Flammable Vapor Sensor".
IDLE (no call for heat, no fault conditions) 1Short 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"
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
Flammable Vapor Sensor (FVS) Lockout
Flammable Vapor Sensor (FVS) Fault Detected
Temperature Sensor Fault Detected
Electronics Fault Detected
Valve Fault Detected
Hard Lockout
2
3
4
5
10
11
12
13
14
15
16
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 status of 1 or 2 as listed in the "System Status And Error Code Chart". Multiple flash codes read
as follows:
Example. Item 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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