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paulsaindon 12-18-2010 08:06 AM

Gas water heater - after long use pilot goes out.
Gas water heater - after long use pilot goes out.
AO Smith Promax GCV 40 100
For over a year my 40-gallon gas water heater will shut down after a long shower. (pilot goes out) I've been away for weeks at a time and on return the pilot is still on. With a short use it is fine, heats back up and pilot will still be on. It only goes out after a long use. When the water is cool in the tank I have to gradually turn up the thermostat on it, letting it rest before moving it up again. If I turn it all the way to were I want it will shutdown again. The screen to filter the incoming air is missing; I have ordered a new one.

Brian99912 07-14-2011 04:51 PM

Fixing problem with AO Smith water heaters. Pilot goes out.
Hi, I have a 2006 model A O Smith Pro Max GCV 40 100 water heater. I didn't clean the plastic screen on the air intake part of the water heater for years and my water heater started shutting off at least once a day. I didn't clean the water heater air intake screen for about 4 to 5 years. I read an article that the spark arrestors on 2003 models and newer can get clogged. I tried what the article mentioned to do and it fixed my problem. Cleaning the air intake was not enough to fix the problem. What you need to do purchase a piece of 1/2 inch pvc pipe and a 1/2 inch pvc elbow connector. You can have the home improvement store cut the pvc pipe down to a 3 feet piece before you leave the store. You want the pipe to reach deep into the air intake section (bottom section) of the water heater and still have enough pipe to connect to a vacuum. Cut off between a 1/2 to 1/4 inch from one side of the elbow connector with a hack saw. Connect the uncut side of the elbow connector to the pvc pipe. Now you have a cleaning wand with a 90 degree (trimmed) connector on the end. Connect the straight end of the wand to a vacuum hose. Take off the air intake screen on the bottom of the water heater. Clean the floor, walls, and especially the ceiling of the air intake compartment. The ceiling contains the spark arrestor and it will clog with lint and dust. You will want to put your hand over the end of the vacuum hose to seal off the air from escaping around the smaller 1/2 inch pvc pipe. And, don't forget to clean the air intake screen, too. That should fix the spark arrestor problem in most AO Smith water heaters (2003 and newer).

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