Troubleshooting - A.O. Smith GPSX-50L Owner's Manual

Please check guidelines below. For your safety, water heater service should be performed only by a qualified service technician.
LED STATUS
A B C
A B C
A B C
A B C
A B C
A B C
A B C
A B C
A B C
A B C
A B C
A B C
A B C
WARNING: DO NOT BY-PASS ANY CONTROLS TO MAKE HEATER OPERATE.
OPERATE ONLY AS WIRED FROM FACTORY.
TROUBLE SHOOTING
Read the GENERAL SAFETY INFORMATION section first.
PROBLEM
An open earth ground circuit to the
ignition system.
Wiring error or a high resistance to
earth ground.
Pressure switch remained closed longer
than 5 seconds after the call for
heat began.
Pressure switch remained open longer
than 5 seconds after the combustion
blower was energized.
Error in the hot surface ignitor circuit.
System in lockout.
Problem in the gas valve driver circuit.
Problem with the internal circuit.
Problem with the internal circuit.
Flame signal sensed out of
proper sequence.
ECO activated.
One of the temperature adjust
buttons stuck closed.
Water temperature sensor is
either open or short circuited.
1. Check that the earth ground connection is
properly connected.
2. Check that the ground conductor on the
water heater is properly connected.
1. Check for proper connection of line
neutral and hot wires.
2. Check that the water heater is securely
connected to earth ground.
1. Pressure switch wiring is incorrect.
2. Replace pressure switch.
1. Pressure switch wiring is incorrect.
2. Pressure switch tubing not connected
correctly.
3. Air intake or exhaust obstructed.
1. Check that all wiring is correct and secure.
2. Replace hot surface ignitor.
1. Gas supply is off or too low to operate.
2. Hot surface ignitor not positioned
correctly.
3. Low voltage to the water heater.
4. Electric polarity to unit is incorrect - test
and correct.
1. Turn power to the water heater off for
10 seconds and the back on.
2. Replace gas control valve.
1. Turn power to the water heater off for
10 seconds and then back on.
2. Replace gas control valve.
1. Turn power to the water heater off for
10 seconds and then back on.
2. Replace gas control valve.
1. Replace gas control valve.
1. Replace gas control valve.
1. Press and release each of the buttons
once.
2. Replace gas control valve.
1. Check that all wiring is correct and secure.
2. Replace gas control valve.
17
SOLUTION