A.O. Smith GPVL-50 Service Handbook page 38

GAS CONTROL LED STATUS CODES
LED Flash Sequence
Short fl ash
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
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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
TCO Limit Lockout
Flame Out Of Sequence
Soft Lockout
– Retry Limit
- Failed TFI
Soft Lockout
- Recycle Limit
- PS/Limit opened
Soft Lockout
- Recycle Limit
- Flame Lost
Soft Lockout
- Flame out of Sequence
Sensed
Flammable Vapor Sensor
Lockout
FVS Fault Detected
Temperature Sensor Fault
Detected
Electronics Fault Detected
Valve Fault Detected
IGNITION STATE AND TIMING
IGNITION STATE
Pre-purge
HSI Warmup
Ignition Activation
Period (IAP)
Flame Recognition
Period (FRP)
Trial For Ignition
Flame Stabilization
Period
Inter-purge
Flame Failure
Response Time
Post-purge
PS Prove Period
PS Fault Delay
(failed open/closed)
Soft Lockout
TCO Limit Lockout
Flammable Vapor
Sensor Lockout
Hardware Fault
Lockout
TIMING
5 seconds (NG models)
15 seconds (LP models)
10 seconds
3.5 seconds maximum
0.5 second
IAP + FRP
Not Applicable
30 seconds
2 seconds max
(@ 1uA fl ame current)
30 seconds
2 minutes
2 minutes
20 minutes
Indefi nite (follow defi ned
procedure to restart)
Indefi nite (follow defi ned
procedure to restart)
Indefi nite (clear fault to restart
in 15 seconds or less)