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Electric Water Heater Tripped for No Reason - Why?
This morning was the coldest day of the year in the Washington DC area
- a bone-chilling 21 degrees F. I stepped into my shower and lo and behold - no hot water! I scurried to the basement, checked the main circuit breaker and the water heater/deep well pump breaker and everything was on - they did not trip. I went to the water heater - a Bradford White Hydrojet that is less than 3 years old - opened the upper panel, pushed the red reset button, heard it click, and waited a few minutes. Later, I felt the copper tube on top warming up again and when I checked the water faucets, the water was starting to get warm. I had to leave for work so I didn't have a chance to see if it would trip again. I'm now in the office for 3 hours and the wife has not called, so I am assuming things are back to normal. I have done a fair amount of reading on the subject but, given the relatively young age of this unit, I don't believe there is anything wrong with the thermostats or the heating elements. So my question is - is this just a fluke, an act of God, a one-time random event that may never happen again? What could have caused it to trip without the main breaker going off? Could the cold weather have anything to do with it? What about the fact that our water source is a deep well pump? I guess I'm just looking for a rational explanation, so that I will have peace of mind if the heater switch does not trip again. Thanks for any insights, tips, comments, etc. |
#3
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wrote:
On 16 Dec 2004 05:16:26 -0800, wrote: This morning was the coldest day of the year in the Washington DC area - a bone-chilling 21 degrees F. I stepped into my shower and lo and behold - no hot water! I scurried to the basement, checked the main circuit breaker and the water heater/deep well pump breaker and everything was on - they did not trip. I went to the water heater - a Bradford White Hydrojet that is less than 3 years old - opened the upper panel, pushed the red reset button, heard it click, and waited a few minutes. Later, I felt the copper tube on top warming up again and when I checked the water faucets, the water was starting to get warm. I had to leave for work so I didn't have a chance to see if it would trip again. I'm now in the office for 3 hours and the wife has not called, so I am assuming things are back to normal. I have done a fair amount of reading on the subject but, given the relatively young age of this unit, I don't believe there is anything wrong with the thermostats or the heating elements. So my question is - is this just a fluke, an act of God, a one-time random event that may never happen again? What could have caused it to trip without the main breaker going off? Could the cold weather have anything to do with it? What about the fact that our water source is a deep well pump? I guess I'm just looking for a rational explanation, so that I will have peace of mind if the heater switch does not trip again. Thanks for any insights, tips, comments, etc. imho: Sometimes breakers just go bad. You can verify this with a clamp on amp meter. Which should only be done by safely trained professionals. later, tom @ www.FindMeShelter.com Tom, it appears you missed the entire point of the OPs message, the "red button" is a THERMAL overload, not an overcurrent one. While your statement about "breakers" is valid, the only part about it which is pertinent is that if the OP doesn't have the skills and knowledge to work on and/or change out a water heater thermostat then he SHOULD call in a professional. The "most likely" cause of it tripping is that either the upper or lower thermostat got "sticky" and didn't open, and the temperature in the heater rose to the point where the thermal overload tripped. I've never seen one "trip by itself" with water in the normal temperature range.(I'm assuming that since you mentioned opening the "upper panel", there's a lower one too, so there's two thermostats on your water heater. Chances are that even if the sticky operating thermostat reopened, it'll stick again in the near future. (Things which go away by themselves usually come back by themselves, y'know. G) The safest thing to do is to replace the sticking if you know enough to be able to circuit trace and catch which one is stuck, otherwise change out BOTH thermostats, they're cheap enough. You may very well be able to get a replacement thermostat at no cost under warranty if you know which one it is. But, since they're relatively cheap and available at Home Cheepo, waiting for the factory to exchange one under warranty isn't much of an option. HTH, and Happy Holidays, Jeff -- Jeffry Wisnia (W1BSV + Brass Rat '57 EE) "As long as there are final exams, there will be prayer in public schools" |
#4
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I can back-up Jeff's advice.
In the first house I owned, I had exactly the same experience with a water heater that was 2 years old. Temp safety switch tripped for "no reason", I reset it, tripped again a couple weeks later, then it became more frequent. Along the way, I noticed that the hot water was intermittently a lot hotter than normal. Flipped a coin and decided to replace the upper thermostat which did not fix it, so I replaced the lower one which *did* fix it. Like Jeff said, they're cheap and if I have the same experience again I'll just replace both. Eric Law |
#5
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EL wrote:
I can back-up Jeff's advice. In the first house I owned, I had exactly the same experience with a water heater that was 2 years old. Temp safety switch tripped for "no reason", I reset it, tripped again a couple weeks later, then it became more frequent. Along the way, I noticed that the hot water was intermittently a lot hotter than normal. Flipped a coin and decided to replace the upper thermostat which did not fix it, so I replaced the lower one which *did* fix it. Like Jeff said, they're cheap and if I have the same experience again I'll just replace both. Eric Law I wouldn't have flipped a coin... I would have gone for the lower stat, on the theory that with typical household hot water usage vs time the heater is probably cycling on that one most of the time and only flipping the upper stat at those times when so much hot water is drawn continuously that that the water at the upper stat gets cool enough to flip it on. That would auger for the lower stat being the one to "wear out" first, huh? I've got a neon pilot lamp hooked to the upper element on mine, and while I'm near the water heater frequently ('Cause it's in my basement home workshop.) The only time I can recall seeing it lit was near the end of one of our daughter's nerve wrackingly long showers, just before I reached over and shut off the heater's water inlet valve. G Happy Holidays, jeff -- Jeffry Wisnia (W1BSV + Brass Rat '57 EE) "As long as there are final exams, there will be prayer in public schools" |
#6
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Thanks for all the great advice. The unit has not tripped again for the
last 48 hours after I pushed the red reset button. However, I did notice that the water is hotter than what it used to be. I adjusted both thermostats to the lowest level (120 degrees F - the factory settings) but the water is still much hotter than before. So I have made a decision to replace both thermostats on my own. The water heater is a Bradford White Hydrojet Model No. MI65R6DS13, 65 gallon tank, double element. However, I've searched around the internet and virtually all of the aftermarket thermostats around are generic, so how do I know which thermostat will work with my heater? Are all upper and lower 240 volt generic thermostats for double element electric heaters interchangeable? The brands I found are American Water (Lowe's) and Apcom (Home Depot) but there is no cross reference chart around that tells me which part fits which model. I could shut the house down, take the existing thermostats off and take then to the hardware store as samples, but I want to avoid doing this if I can. I would thus appreciate any assistance/advice in this regard. Thanks and best regards. |
#7
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posted for all of us....
Thanks for all the great advice. The unit has not tripped again for the last 48 hours after I pushed the red reset button. However, I did notice that the water is hotter than what it used to be. I adjusted both thermostats to the lowest level (120 degrees F - the factory settings) but the water is still much hotter than before. So I have made a decision to replace both thermostats on my own. The water heater is a Bradford White Hydrojet Model No. MI65R6DS13, 65 gallon tank, double element. However, I've searched around the internet and virtually all of the aftermarket thermostats around are generic, so how do I know which thermostat will work with my heater? Are all upper and lower 240 volt generic thermostats for double element electric heaters interchangeable? The brands I found are American Water (Lowe's) and Apcom (Home Depot) but there is no cross reference chart around that tells me which part fits which model. I could shut the house down, take the existing thermostats off and take then to the hardware store as samples, but I want to avoid doing this if I can. I would thus appreciate any assistance/advice in this regard. Thanks and best regards. Why not call up the manufacturer & have them sent to you? -- Tekkie |
#8
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#9
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On Thu, 16 Dec 2004 10:19:12 -0500, Jeff Wisnia
wrote: wrote: On 16 Dec 2004 05:16:26 -0800, wrote: This morning was the coldest day of the year in the Washington DC area - a bone-chilling 21 degrees F. I stepped into my shower and lo and behold - no hot water! I scurried to the basement, checked the main circuit breaker and the water heater/deep well pump breaker and everything was on - they did not trip. I went to the water heater - a Bradford White Hydrojet that is less than 3 years old - opened the upper panel, pushed the red reset button, heard it click, and waited a few minutes. Later, I felt the copper tube on top warming up again and when I checked the water faucets, the water was starting to get warm. I had to leave for work so I didn't have a chance to see if it would trip again. I'm now in the office for 3 hours and the wife has not called, so I am assuming things are back to normal. I have done a fair amount of reading on the subject but, given the relatively young age of this unit, I don't believe there is anything wrong with the thermostats or the heating elements. So my question is - is this just a fluke, an act of God, a one-time random event that may never happen again? What could have caused it to trip without the main breaker going off? Could the cold weather have anything to do with it? What about the fact that our water source is a deep well pump? I guess I'm just looking for a rational explanation, so that I will have peace of mind if the heater switch does not trip again. Thanks for any insights, tips, comments, etc. imho: Sometimes breakers just go bad. You can verify this with a clamp on amp meter. Which should only be done by safely trained professionals. later, tom @ www.FindMeShelter.com Tom, it appears you missed the entire point of the OPs message, the "red button" is a THERMAL overload, not an overcurrent one. While your statement about "breakers" is valid, the only part about it which is pertinent is that if the OP doesn't have the skills and knowledge to work on and/or change out a water heater thermostat then he SHOULD call in a professional. OH! I thought I DID miss what he said. Thought it was another breaker going bad story. Atleast I got the suggestion to have it looked at by 'trained professionals' part right. :-P The "most likely" cause of it tripping is that either the upper or lower thermostat got "sticky" and didn't open, and the temperature in the heater rose to the point where the thermal overload tripped. I've never seen one "trip by itself" with water in the normal temperature range.(I'm assuming that since you mentioned opening the "upper panel", there's a lower one too, so there's two thermostats on your water heater. Chances are that even if the sticky operating thermostat reopened, it'll stick again in the near future. (Things which go away by themselves usually come back by themselves, y'know. G) The safest thing to do is to replace the sticking if you know enough to be able to circuit trace and catch which one is stuck, otherwise change out BOTH thermostats, they're cheap enough. You may very well be able to get a replacement thermostat at no cost under warranty if you know which one it is. But, since they're relatively cheap and available at Home Cheepo, waiting for the factory to exchange one under warranty isn't much of an option. HTH, and Happy Holidays, Jeff later, tom @ www.CarFleaMarket.com |
#11
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#12
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On Sat, 18 Dec 2004 13:46:50 -0500, Jeff Wisnia
wrote: I won't disagree that the elements could *also* be bad, but "how the F" will that trip a thermal breaker? Some bottom thermostat setups only switch one side of the 220 going to the element. If the element suffers a failure that allows current leakage but isnt catastropic to the element you have a 110v potential on one side and a nice ground path through the defect/water on the other so the element can continue to heat at 110v with thermostat off. Eventually it could get hot enough to pop the overheat on the top thermostat It would seem that the odds of this happening would be somewhere around the odds of winning powerball but it is possible. Steve B. |
#13
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Steve B. wrote:
On Sat, 18 Dec 2004 13:46:50 -0500, Jeff Wisnia wrote: I won't disagree that the elements could *also* be bad, but "how the F" will that trip a thermal breaker? Some bottom thermostat setups only switch one side of the 220 going to the element. If the element suffers a failure that allows current leakage but isnt catastropic to the element you have a 110v potential on one side and a nice ground path through the defect/water on the other so the element can continue to heat at 110v with thermostat off. Eventually it could get hot enough to pop the overheat on the top thermostat It would seem that the odds of this happening would be somewhere around the odds of winning powerball but it is possible. Steve B. You know, I thought of that, which is why I said "arcane", but I've never heard tell of that kind of failure before. And you are correct about the possibility that a single pole lower thermostat could let that sort of fault keep heating the water regardless of the state of that thermostat. But I'm not up to visualizing what kind of mechanical/corrosion failure would permit that sort of current flow; I'm kinda out of my element here. G The OP's problem *might* not be with the control thermostat, but it's darned well the way to bet. Happy Holidays, Jeff -- Jeffry Wisnia (W1BSV + Brass Rat '57 EE) "As long as there are final exams, there will be prayer in public schools" |
#14
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I think the lower one runs until it's satisfied, and then the upper one. Or
is it the other way around? Ah, well. Rip em both out. -- Christopher A. Young Learn more about Jesus www.lds.org www.mormons.com "EL" wrote in message m... I can back-up Jeff's advice. In the first house I owned, I had exactly the same experience with a water heater that was 2 years old. Temp safety switch tripped for "no reason", I reset it, tripped again a couple weeks later, then it became more frequent. Along the way, I noticed that the hot water was intermittently a lot hotter than normal. Flipped a coin and decided to replace the upper thermostat which did not fix it, so I replaced the lower one which *did* fix it. Like Jeff said, they're cheap and if I have the same experience again I'll just replace both. Eric Law |
#15
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This problem has defied all explanation.
I have replaced both thermostats - the upper and the lower - with the exact same model that the unit had - and the red button tripped again! So by process of elimination, I have to replace the elements now. I have no problem doing both but I've never done this before. Do I just unscrew these things or do I have to drain the tank? Any instructions would be appreciated. Thanks once again. |
#16
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This problem has defied all explanation.
I have replaced both thermostats - the upper and the lower - with the exact same model that the unit had - and the red button tripped again! So by process of elimination, I have to replace the elements now. I have no problem doing both but I've never done this before. Do I just unscrew these things or do I have to drain the tank? Any instructions would be appreciated. Thanks once again. Usually, stats sticking or being out of calibration will cause the red button to trip. I am thinking that an element could cause it, but only under certain circumstances. Anyway, to replace the elements, cut off the power to the tank and the incoming water. It is possible to replace the elements without draining the tank completely, but if you have never done it, I'd recommend draining the tank. Once you have it drained, the elements either screw out or are attached with 4 bolts on some models I have seen. Keep in mind that the red button is a high limit and is a safety device. Do not continue to experiment with a solution to this problem. Ever seen on the news what is left of a house when the water heater blows?? Not very much....think about it. Bobby |
#17
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Filipo wrote:
This problem has defied all explanation. I have replaced both thermostats - the upper and the lower - with the exact same model that the unit had - and the red button tripped again! So by process of elimination, I have to replace the elements now. I have no problem doing both but I've never done this before. Do I just unscrew these things or do I have to drain the tank? Any instructions would be appreciated. Thanks once again. Is there ANY possibility that you might have miswired something when you replaced the thermostats? Did you have or make an accurate diagram of just which wire went to which terminal on the two thermostats before you removed them? I should have asked before, but is the "red button" you refer to *really* on a high temperature overlimit thermostat. i.e. is it part of the upper thermostat assembly or otherwise on something in thermal contact with the tank shell? I'm frustrated, 'cause I know that if I was on the scene with my clamp-on ammeter/VOM I'd have been able to diagnose it much better. BTW if you *are* going to change out the elements, and they are threaded into bosses on the tank shell they'll have a large hex section on them and you'd be well advised to pick up an "element socket wrench" to unscrew them with unless you have a socket of the proper size already. They usually don't like to come out if you go after them with a pair of Channelock pliers or an adjustable wrench, and you can screw up a new element trying to tighten it firmly without a socket wrench. Those element socket wrenches are usually stocked right near the elements and only cost a couple of bucks. Good Luck, Jeff -- Jeffry Wisnia (W1BSV + Brass Rat '57 EE) "As long as there are final exams, there will be prayer in public schools" |
#18
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On 19 Dec 2004 13:59:05 -0800, "Filipo"
wrote: This problem has defied all explanation. I have replaced both thermostats - the upper and the lower - with the exact same model that the unit had - and the red button tripped again! So by process of elimination, I have to replace the elements now. I have no problem doing both but I've never done this before. Do I just unscrew these things or do I have to drain the tank? Any instructions would be appreciated. Thanks once again. An experience plumber can sometimes replace an element without draining the tank but I would never try it myself and I have done about 20 over the years. Go ahead and drain the tank then replace them and save yourself a headache. Stee B. |
#19
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The red button on the upper thermostat did not pop this morning, and
that may have been because I re-adjusted the 2 brand new thermostats to their factory presets. Both thermostats are so-called "Apcom Style" thermostats made as OEM by Camco. They are currently on sale at all Home Depot stores for 3 bucks apiece, which makes me wonder if they are crappy because they are so cheap, or they are so cheap because they are so crappy. They are the exact same replacement models that came with my Bradford White water heater, so I'm pretty sure my wiring is the same, except I had a little problem tightening the screw on the black wire of the lower stat because the screw offered some resistance so I forced it and may have stripped it a little bit, but there is still some electrical contact, I think. Each thermostat has 4 settings - "Hot", "A" "B" and "C". "Hot" is the factory preset at 120 degrees F. I turned the white knobs to "A" before I installed them because I was guessing "A" might be at least 135 degrees F, which is supposedly the minimum temperature needed for the clothes washer. Then I installed them. Shortly thereafter, the hot water temp zoomed up to higher than normal and the red button tripped. I reset the red button. Then I turned the white knobs back to "Hot" and I heard a distinct click on the upper thermostat, as if it was closing (or opening?) as I was turning the white knob back to "Hot" from A"". It seems to that my act of changing the factory presets from "Hot" to "A" prior to installation may have confused the thermostats. Perhaps I should have installed them with the factory presets at 120 degrees F before I decided to change anything. Just as a car needs a break-in period, perhaps the thermostats need to be installed first before they should be adjusted temperature-wise. Does this make sense? Sorry for the long-winded explanation. I'm pretty happy now at the 120 degrees F factory settings, as long as they don't trip again. So I'll suspend the element replacement project for another day. Thanks all for your support! |
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