Gas Input Rate
GKNE-SVX001B-EN
35
Steady Off
Internal control fault, or no power.
1. Line voltage on terminals 120 and C on
transformer.
2. Low voltage (24V) on terminals 24 and C on
transformer.
3. 5 Amp fuse on circuit board.
Steady On
Control internal failure or bad ground.
1. Common side of transformer grounded to
chassis.
2. Loose spark ignitor.
2. Flashes
In lockout from failed ignitions or flame
losses.
1. Gas supply off or gas supply pressure too low.
2. Flame sense rod contaminated or loose wire.
3. Gas valve switch is off or wires are not
connected.
4. Broken or cracked porcelain on flame probe or
spark ignitor.
3. Flashes
Pressure Switch open with inducer on or
closed with inducer off.
1. Obstructions or restrictions in appliance air
intake or flue outlet are preventing proper
combustion airflow.
2. Moisture or debris in tubing that connects
pressure switch and draft inducer.
3. Airflow switch jumpered or miswired.
4. Flashes
Limit or rollout switch is open.
1. Open manual reset rollout switch.
2. Gas pressure too high, over fire condition.
3. Incorrect airflow due to blockage or motor not
operating.
5. Flashes
Flame sensed while gas valve is off.
Flame probe miswired or shortened.
6. Flashes
On-board microprocessors disagree.
Thermostat is interfering with control board.
Table 13. Separated combustion tubular blower troubleshooting with LED indicator assistance (continued)
LED STATUS
INDICATES
CHECK/REPAIR
