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Old 04-22-2016, 07:31 AM   #1
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A Little Help from my friends!

Hot Water heater woes..1994 Airstream Atwood Water Heater..replaced Ignitor board…checked thermostats and power from the inside switch all good. The silly thing will still not come on or work. Question: When the switch to the Hot Water heater is turned on there is no red light…does the light in some way play a part in the electric equation?…

What else should I check?
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Old 04-22-2016, 09:19 AM   #2
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the most common failure of a hot water heater is the thermistors. There are 2 small, dime size buttons, attached to the face of the heater. Often behind a cardboard cover. They control the on/off function of the heater.

If the heater is cold both should be closed. To test remove the connecting wires on either side of the pair and test for continuity across them. If the test shows an open one has failed and you should replace them. They are about $20.00.

You can test the heater by replacing them with a jumper wire. Jumper them and try to light the heater.

Do not use the jumper to get the water to a usable temperature as you may have an explosion on your hands.
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Old 04-22-2016, 10:13 AM   #3
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The light is a "fail" light. If the heater fails to ignite the light comes on. If the heater does not ignite after a short time the light comes on.
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Old 04-22-2016, 10:13 AM   #4
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I've check the continuity on the thermostats…it shows to be closed…the heater is cold…My manual shows an EGO switch on the back of the hot water heater with a red reset button…generally a safety switch for overheating…thoughts of that button needing reset?…quiet a chore to get to..
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Old 04-22-2016, 10:15 AM   #5
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Bill M…no red light at all…worked before however..
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Old 04-22-2016, 11:18 AM   #6
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If the high side thermistor was fused closed and the heater when off on high limit, the EGO switch, I would reset the switch. If the heater lights after that i would consider changing out the thermostors.

The low thermostor closes on temperature drop, thus allowing the heater to light. The high thermosotor opens on temperature rise, thus turning the heater off. The failure mode for the high side is not that easy to check.
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Old 04-22-2016, 12:47 PM   #7
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Have you checked to see that there is 12 volts at the water heater. Maybe you have a blown fuse.
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Old 04-22-2016, 03:05 PM   #8
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it may sound strange but make sure you have gas at the heater. Crack the gas line at the heater and leave it cracked till you smell gas.

While the heater can usually purge any air in the line ,from changing tanks, it won't hurt to make sure.

When trouble shooting you have to cover all bases.
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