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Water runs cold for days then suddenley is warm sometimes hot. Type C13 Cat 12h

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Have you checked the error codes on the controller?

Posted on Jul 28, 2009

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Our tankless hot water heater runs cold sometimes.


Check for crossover: Where bad faucet cartridge or check valve lets cold enter hot pipe so hot never arrives at tap.
http://waterheatertimer.org/Crossover.html
If problem is not plumbing, then add a comment and describe which water heater you have, including approx age and what has been done so far.
Call local plumber to fix tank-type heater
If you have tankless, call manufacturer to get list of local technicians who work on these computers that heat water, or save money and tear it off wall and install tank-type heater today.
http://waterheatertimer.org/How-to-install-gas-water-heater.html
Gene

Aug 04, 2013 | Bosch & Tankless LP Hot Water Heater

1 Answer

Hello we have Bradford hot water tank model #MI65R6DS13. Our problem, I keep having to press the tanks reset switch for us to get hot water. At the same time after I press the reset switch we have hot...


No the top thermostat is the first place I would start to replace. They run about 14.00 more than likely it isn't controling right. Turn power supply to water heater off and replace thermostat.

If you was getting scalding hot and then turning cold without tripping the thermostat it would be the top element working and the bottom one bad.
Bottom element good it will give you luke warm water for a while then gradually turn cold because it's heating the bottom of the tank.

Hope this will help you out.

Oct 09, 2010 | Fasco Bradford White Hot Water Heater...

1 Answer

I am trying to find out why the cold water line leading out of the WH unit is sometimes hot but no hot water coming out of the cold water faucets in the house and sometimes there is no Hot water in half...


Believe it or not one of the sink or shower fixtures is by-passing when closed.Gravity circulation in standby mode(not being used) is the cause.Trace the (warm )cold water pipe to the fixture after no one uses the water for a while.Good luck.

Sep 23, 2010 | Rheem 81VP6S/430126 Water Heater

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No water coming from hot valve on faucets


Have you thought about possible calcium buildup in your hot water tank/pipes? I am helping a friend in Palm Springs CA (California not Canada) and we are going to pour a really huge pile of vinegar into the hot water tank (let it sit for a day) then open up the hot water taps to the kitchen (where we don't have hot water flowing very well), then going to let everything sit for another day. Remove the aerator from the kitchen faucet after letting the vinegar/water solution sit in the pipes for a day, and turn on the kitchen hot water tap. Once all the **** is drained out, you must of course drain out the vinegar/water solution from your hot water tank or you will smell like French Fries (in Canada we put vinegar on French Fries) when you shower for a few days.

If you don't understand what the basic chemistry of dissolving calcium via this method is all about, then please call a professional plumber. Hope this helps, and remember that Google is your friend (sometimes), but be careful...

Apr 27, 2010 | Rheem 40 Gallon FVR NATGAS Low WATER...

1 Answer

I have hot water for a minute then it goes to warm. I took off the 2 wires on each element and I have 15 ohms on the top and 5.5 on the bottom. Is my bottom element bad?


Sounds like bottom element may be bad but usually reads open circuit if bad. Also tan k would run about 8 gallons hot water then go cold. lots of warm water usually means bad dip tube.
Check if tank is hot at bottom element when not used for a while. If bottom element is still cold then bad element.
If bottom element is hot - (all water in tank is hot then you have a bad "dip tube" This is allowing incoming cold water to mix with outgoing hot water. The dip tube is usually A part of the cold water nipple or B located under the cold water inlet nipple.

Jan 18, 2010 | Rheem 40 GAL ELEC TALL Water Heater 6YR SC...

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I have replaced my electric water heater and I have checked everything I can think of and I still run out of hot water in 3 minutes. What on earth is the problem.


3 minutes?? does the water run cold then? or just warm?
Is this what the tank you replaced was doing? If so, then you may have: 1 a recirculating pump instant hot water system thats faulty and allowing cold water backflow into hot water piping. 2 A tempering valve that has stuck, allowing cold water into your hot water system.
Or maybe a broken or missing dip tube in your new heater.
If after 3 minutes the water is coming cold out leave that faucet running and go to heater and feel the hot water outlet pipe from the heater. if that pipe is hot then the heater is not the problem. If the hot pipe from the heater is cold the heater is the problem. (Make sure the cold pipe coming into the heater is connected to the Right side marked "cold" !) If there is a tempering valve by the heater: feel the output from the tempering valve, if it is cold and the pipe from the heater to the tempering valve is hot, then the tempering valve is the problem. If all these are OK somewhere in your plumbing system hot and cold may be connected possibly a faucet or showerhead that is shut off at the spout/head, but hot/cold handles are left turned on then cold water can backflow thru hot pipe.

Jan 18, 2010 | Rheem 40 GAL ELEC TALL Water Heater 6YR SC...

1 Answer

Water heater doesn't keep running


Sounds like youo have a problematic gas valve. But I would get a gasfitter to replace it. Not for the amatuer.

Nov 20, 2009 | RTO Atwood DSI-RV Water Heater-6 Gallon

1 Answer

WE HAVE CHANGED THE THERMOSTATS BOTH OF THEM, WE HAVE CHANGED BOTH ELEMENTS AND THE WATER STILL DOENT GET HOT ENOUGH. WE HAVE TURNED UP BOTH THERMOSTATS AND STILL NOT HOT ENOUGH. WHEN YOUR RUNNING THE HOT...


WE THOUGHT WE NEEDED ANOTHER THERMOSTAR, BUT WHEN WE WERE LOOKING FOR THE PART THE EMPLOYEE ASKED WHAT WAS THE TROUBLE. WE EXPLAINED, HE SAID YOU DEFINATLY DO NOT HAVE A PROBLEM WITH YOUR TANK AND ASKED IF WE HAD A SINGLE HANDLED FAUCET WITHIN THE HOUSE. NO WE DONT. HE SAID IT SOUNDS LIKE WATER IS MIXING WITH THE COLD WATER THATS THE REASON FOR THE WARM--COLD--WARM WATER. COME TO FIND OUT SINCE WE ARE REMODLING THE BATHROOM, WE HAD BOTH THE HOT AND COLD WATER TURNED ON IN THE SHOWER--BUT WERE PLUGGED OFF AT THE SHOWER HEAD AND THE FAUCET UNTIL THE TILE IS INSTALLED. SOOO ALL MY HUSBAND HAD TO DO WAS TURN OFF THE WATER IN THE SHOWER. NOW WE HAVE PLENTY OF HOT WATER, NO WARM COLD. YEA!!!

Jul 06, 2009 | Whirlpool Water Heaters

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