Water Heater not heating- system lockout message constant

Simply means hot water heater called for heat for 1 hour and never rose in temperature or reach stepping, unit automatically goes into lockout. I would reset power

Make sure all gas is turned on to the heater, ignition lockout can be one of several things, the majority of the time its a control board but, it could also be water in the heat exchanger pot, which would keep the ignitor from working, or a bad igniter.

worth checking over heat temp sensors (klixon ) sensors can cause heater to go into a cool down purge Through an open circuit heat exchanger (Klixon ) temp sensor Ive seen before good luck

There is either a problem with the ignitor or the flame sensor.

sounds like a bad thermacouple. thats the "sensor* that the pilot flame hits

I know that depending on what part of the country you live in, some areas can have there utility equipment out side the home not sure of your at but the exhaust must have a certain distance from the unit. If you exhaust threw a wall you should be fine. That being said I would check the inlet to make sure that you have good water flow there should be a small filter at the inlet for the cold water. You check and clean this anyway because you water was off. Then bleed the air out of the system. There are other things to check, but start there.

usal problem escpecialy on the farthes spout because it has to heat up the water from the heater to that tap with a tankles u can put a seprate circulating system which requeris another smaller tankles unit or elctric unit to heat and ciculating pump and run a line all the way to ur farthes tap which keeps constant hot water to everything but all of this is farily expensive alot of times most people usaly deal with it if u look more into it email me and i can give u a detaled instructions.

The FV lockout varies by brand of heater... some require simple cleaning, while Rheem requires part
Following link has rundown for various models:
http://waterheatertimer.org/troubleshoot-flammable-vapor-on-gas-water-heater.html

Burner going out could be FV lockout, low gas pressure, or gas control valve thermostat:
Following link has troubleshoot for pressure and various models of gas control:
http://waterheatertimer.org/troubleshoot-gas-water-heater-thermostat.html

Google,put model number into search followed by " user manual " , should help you find the instructions.

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