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Old 12-11-2012, 07:28 PM   #1
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Water heater 'C' class

Hi again all,

More challenges this time with my water heater!?

Sometimes I can flick the switch and it fires up no problem, other times nothing... Leaving it for a period after traveling and it fires up again?
Anyone have any ideas?
Thanks
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Old 12-12-2012, 02:32 AM   #2
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Well, not knowing the brand or model, some common things to check, or more like common maint, use a small wire brush, and needle nose pliers.. remove each connection on the thermal switches, and clean the contacts one at a time .( so you don't do like me and forget where they go) . there is also a thermal sensor in the heat tube, that tells the for lack of a better word, computer there is fire. Usually there is a start ckt, turns on ignitor, then turns on gas for 5 or 10 seconds,, if heat is sensed, all is good.. Each temp switch is NC ( normally closed) they open when it gets hot. 140 is usually the hot sensor, and 180 I think is the fail safe switch temp. but if any one of them does not have a good enough contact, yup, it won't start. might also check the location of the flame sensor to be sure it is positioned in the flame. So in general terms, Thats what you should look for to start with.. you should see 12V coming in to it on 2 wires. that can also be intermittent. check there too.. ;-) good lluck.
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Old 12-14-2012, 09:46 PM   #3
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You might take off the burner tube and clean. A spider web is a common problem there.

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