http://twincitieswatersystems.com/i-have-a-natural-gas-water-heater-that-lights-and-gets-water-up-to-temperature-but-then-it-goes-out/ Water treatment systems, water softeners, water heaters Minneapolis, MN - CALL: (612) 234-5112 Tue, 02 Mar 2010 17:47:55 -0600 http://wordpress.org/?v=2.9.2 hourly 1 http://twincitieswatersystems.com/i-have-a-natural-gas-water-heater-that-lights-and-gets-water-up-to-temperature-but-then-it-goes-out/comment-page-1/#comment-3588 Corky R Fri, 20 Nov 2009 01:30:44 +0000 http://twincitieswatersystems.com/i-have-a-natural-gas-water-heater-that-lights-and-gets-water-up-to-temperature-but-then-it-goes-out/#comment-3588 If the unit's pilot burns long enough for the burner to ignite and heat the water, then the thermocouple is ok. You'll need a new gas thermostat/valve assembly, the gray box on the side of the heater that has the on/off knob and the pilot button on top. Why it happens I don't know and I've talked to several service managers of the companies who manufacture these things and they can't tell me either, but, the small magnet inside, that is activated by the thermocouple and holds the gas valve open so the gas can flow into the burner, gets weak and releases it instead of holding on. When it does then the fire goes out on the pilot and it won't relight when more hot water is called for. You'll need to replace the whole valve assembly which simply screws into the side of the tank. The burner and themocouple and pilot feed lines all connect on the underside. Make sure you have the proper replacement for natural gas. Disconnect all the tubes from the under side of the valve, drain the water from the tank, unscrew the old valve and install the new valve in that hole. Reconnect all the tubes below and it should be fixed. If the unit’s pilot burns long enough for the burner to ignite and heat the water, then the thermocouple is ok. You’ll need a new gas thermostat/valve assembly, the gray box on the side of the heater that has the on/off knob and the pilot button on top. Why it happens I don’t know and I’ve talked to several service managers of the companies who manufacture these things and they can’t tell me either, but, the small magnet inside, that is activated by the thermocouple and holds the gas valve open so the gas can flow into the burner, gets weak and releases it instead of holding on. When it does then the fire goes out on the pilot and it won’t relight when more hot water is called for. You’ll need to replace the whole valve assembly which simply screws into the side of the tank. The burner and themocouple and pilot feed lines all connect on the underside. Make sure you have the proper replacement for natural gas. Disconnect all the tubes from the under side of the valve, drain the water from the tank, unscrew the old valve and install the new valve in that hole. Reconnect all the tubes below and it should be fixed.

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