System Error Codes
The micro-controller inside the gas control monitors the
fl
ammable vapour 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
fl
ash an error code. Table 2 lists the System Status Codes for
the Honeywell control. Refer to Table 2 and to the “Trouble
Shooting Guide” to diagnose the problem before attempting
corrective action. See also “Flammable Vapour Sensor” and
“Resettable Lockout”.
Honeywell Troubleshooting Chart - User Control
LED Flash Sequence
Control Status
Short
fl
ash
once every four
seconds
IDLE (no call for heat,
no fault conditions)
“Heartbeat”,
alternates bright/dim
Call For Heat
(no fault conditions)
One Flash,
three second pause
Low Flame Signal
(control continues to operate)
Two Flash,
three second pause
Pressure Switch Failed
Closed
Three Flash,
three second pause
Pressure Switch Failed Open
Four Flash,
three second pause
TCO Limit Lockout
Five Flash,
three second pause
Flame Out Of Sequence
Six-One Flash,
three second pause
Soft Lockout
– Retry Limit
- Failed TFI
Six-Two Flash,
three second pause
Soft Lockout
- Recycle Limit
- PS/Limit opened
Six-Three Flash,
three second pause
Soft Lockout
- Recycle Limit
- Flame Lost
Six-Four Flash, three
second pause
Soft Lockout
- Flame out of Sequence
Sensed
Seven Flash,
three second pause
Flammable Vapour Sensor
Lockout
Eight-One Flash,
three second pause
FVS Fault Detected
Eight-Two Flash,
three second pause
Temperature Sensor Fault
Detected
Eight-Three Flash,
three second pause
Electronics Fault Detected
Eight-Four Flash,
three second pause
Valve Fault Detected
Table 2
– 35 –
