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Morco water heater eco 11 litre have replaced thermocoupling 2 months ago,now gas burner cutting off whilst showering or wont stay lit sometimes

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dlmcmasters
  • 625 Answers

SOURCE: Furnace runs about 1 minute, then total shutdown

What type of gas supply line do you have? Is it black pipe or copper? If it is copper, there can be a film like substance that builds up on the inside of the copper. The debris will the get caught in a pre screen where the supply enters the valve thus cutting the supply of gas to the unit. Also, the thermocouple may be bad. You didn't say that you replaced it. Try replacing it as well. Also, you could have a limit switch turning the system off and thus cutting the gas off completely but it is highly unusual for the pilot to be cut off as well unless the pilot is being blown out when the gas is shut off. Also, turn the unit to fan only without calling for heat. Using a flame of some sort, put it into each baffle of the heat exchanger. If your flame is being blown around in one of the baffles, then you have a hole in the heat exchanger and what is happening is that the roll out switch is cutting the unit off and the air still moving through the heat exchanger is blowing the pilot out. I have seen this actually happen. If your furnace is in excess of 15 years old, it does need to be checked for possible holes. If it is in excess of 25 years old, it is a huge possibility that the unit has already developed a hole. If you feel hair coming out of one of the baffles, then shut the unit down immediately and have it replaced!

Posted on Apr 05, 2009

  • 1 Answer

SOURCE: I have a rinnai infinity

flow metering device is causing the heater to shut down until the temp changes enough u must adjust it on the heater refer to instillation manual or call rinnai

Posted on Mar 15, 2011

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Pool heater: Pentair minimax 250 M millivolt propane. Problem: Burner does not want to stay on - cuts out or does not even come on when using switch. Technicians have already tested all electronics and...


Hi there

On these heaters there are a number of safety cut out switches and some are not obvious,
1. If fitted I guess they have changed the thermocouple ( this sits in the pilot flame and connects to the gas valve) if they have changed the gas valve.
2. There is normally a control link to the heater to prevent it starting if the pump is not running or the pressure is too low. This is usually a wire that runs through the pump motor overload(if fitted) and the inlet or outlet water pressure switches ( if both fitted) and then to the time clock (again if fitted) and to the thermosts on the heater.

I hope this helps, but please come back to me if you need more info

Regards
Gordon

Jun 16, 2011 | Pentair Air Conditioners

1 Answer

Do I need to replace the thermocoupling on my Reliance 501 gas water heater? Model is 5 30 NOMT7 C. Recently, I've noticed an intermittent problem with the the hot water not staying consistent. So we're...


The thermocouple is a safety for the gas valve. It tells it the pilot light is lit. If your pilot light is not going out and the burner fires when you turn up the thermostat, it is all working as it should. In other words, if you don't need to re-light the pilot, your thermocouple is OK. Turning up the temperature of the water is a good idea, just be careful not to burn anyone with the hotter water. You mite want to try a water saver shower head. Some don't throw enough water to get the soap off, but I bought one that can be turned to adjust flow and we have been happy with it. If I missed what you need from this, please let me know. Roger

Apr 10, 2011 | Air Conditioners

2 Answers

My pilot flame goes out after a short while and the gas shuts off then as it should. Why does the pilot flame cut out so rapidly?


Because she ain't gettin confirmation of ignition.
Your flame sensor is contaminated most likely.
Get a dry brillo pad and clean that dude. Give it the alabama gloss and the mississippi shine then reinstall and retry.
I have 2 links. Old school RobertShaw kanthal Spark/sensor notes and Auto cycling furnace easy fix.

themobilian_1910.jpg
Let me know dude!

Mar 16, 2011 | Air Conditioners

1 Answer

I have a rinnai infinity series 24 litre hot water system and the problem is that the water sometimes goes cold for 1 or 2 minutes whilst showering ! Why is this happening ?


flow metering device is causing the heater to shut down until the temp changes enough u must adjust it on the heater refer to instillation manual or call rinnai

Mar 15, 2011 | Rinnai Air Conditioners

1 Answer

Can't light a vulcan heritage gas heater, the pilot light lights, but as soon as I try to lift my finger off the button to ignite the heater, the pilot flame always goes off.


Hi and welcome to FixYa, I am Kelly.

What you are experiencing is the lack of a signal from the thermocouple to the gas valve. I.e. the thermocouple is not passing heat information at all. This is caused by either a defective thermocouple, a dirty mating area where the thermocouple connects to the gas valve or... an improperly positioned thermocouple that is not "in the flame" with the pilot lit.

  • First make sure the FIRE end of the thermocouple is in the flame when lit. (reposition if necessay)
  • Next disconnect the thermocouple by unscrewing the fitting on the top of the gas valve. (No gas will come out) Clean the metal mating area as best you can and then re-install the thermocouple. Just a good snug fit. Once you feel it come snug add 15 degrees of tightening motion with a wrench.
Attempt to light the pilot... wait 45 seconds to 1 minute while holding the pilot button down before letting it up. If it stays lit.... GOOD JOB. If it goes out the next step is to replace the thermocouple. If after replacing the thermocouple it does not stay lit the remedy is to replace the gas valve. There are no short cuts and the sequence of repairs is just as I stated in order.

You can remove your old thermocouple and walk in to almost any appliance parts supply or Plumbing and heating supply to purchase the correct thermocouple without a part number. They will match it up with yours.

Thanks for choosing FixYa,
Kelly

Feb 20, 2011 | Air Conditioners

1 Answer

I have a gas water heater, 6 years old. The pilot will lite and then the burner lites up, after several seconds the burner goes out. It won't stay lite. The other gas appliances are working. What's...


The Thermocouple, which is part of the ignition system may be loose, where it screws into the gas control valve. Or it needs replacing.

But, first turn the gas off to the water heater, allow the burner compartment to cool off and with a flash light do a visual inspection of the burner chamber. If you see rust or scale in the chamber or on the burner, it will need to be cleaned. You can use a wire brush to clean the burner, making sure you do it carefully and not too aggressively. Use a shop vac with a hose and crevice tool to remove the debris that was created when you cleaned the burner. Be sure to vacuum the burner ports well.

Look for the Thermocouple ... it will be in front of the pilot flame and look like a 2 to 3" long piece of copper. It will have a copper tube running from the bottom of it to the gas control valve. Does the Thermocouple look pitted and worn? Dos it have a hazy film on the tip? If so, use some very fine grit sand paper to polish the Thermocouple. You don't want to sand it, as much polish it. After you have completed that, use a cotton ball dipped in alcohol to wipe off the Thermocouple.

You remember the copper tubing I mentioned that runs from the Thermocouple to the Gas Control Valve? Trace that tuning to the control valve and see if you can loosen the connecting nut to the control valve with your fingers. If you can, it's loose and needs to be retightened. Finger tighten it and with an appropriately sized open end wrench tighten only 1/4 turn more. Turn the gas back on and light the pilot, following the lighting instructions on the water heater. Allow the control knob to remain in the pilot position for at least 1 minute before turning the control knob to ON.

The water in the tank has probably cooled enough that the burner should fire up. If it doesn't turn on the hot water side of faucet, to drain the tank some, so that the burner will fire.

Once it fires, take a stick match, light it then blow it out. Quickly place it next to the opening at the top of the tank where the Exhaust Vent Pipe is connected to the tank. If the vent is drawing properly, it should **** the smoke quickly up the vent pipe. If it doesn't, you'll need to check the vent pipe for obstructions or disconnections at the couplings along the pipe.

If the burner does not continue to operate properly after you have completed all of this. Replace the Thermocouple. Remove the one you now have and take it with you to a hardware or home improvement store, so that you can match it up to the ones that are available.

Hope all this solves your problem. Please let me know.

Feb 12, 2011 | Air Conditioners

1 Answer

I have old rheem ruud hot water tank. it's down for 4 day's, i would like to get it started, but the thing i would like to find out is can i get it going by lighting it up by using lighter or not. The...


Yes you can light it with a BBQ type lighter (long enough).
If it lights and stays lit then you need to change the thermocouple (looks like a little pipe off gas valve)

In simplest terms, a thermocouple is a temperature sensor. Normally inexpensive, a thermocouple is standard on hot water tanks. If your thermocouple breaks or you feel it is not working properly, consider replacing it b?p=y23r90wnbq7oglkvtnbuhgyhrktxauzqpeoaddsf&t=18g7grtjm%2fx%3d1290445898%2fe%3d2143440281%2fr%3dacont%2fk%3d5%2fv%3d8.1%2fw%3d0%2fy%3dyahoo%2ff%3d2680761980%2fh%3dcg49imfjb250iibzzxj2zulkpsjzmjnsotb3tkjxn09nbgtwve5ivuhnewhys1r4yvv6cxbfb0fezfngiibzaxrlswq9ijq4mtmwnteiihrtdg1wpsixmjkwndq1odk4ota5njiwiia-%2fq%3d-1%2fs%3d1%2fj%3d6f060d4c&u=13gohjn6b%2fn%3df8a.bkwnpkw-%2fc%3d715481.14405591.14260180.13829426%2fd%3dlrec%2fb%3d6235626%2fv%3d1 lg.php?category_id=6&content_type=article&content_type_id=584031&key_page=1721642411054458764&site_id=1&bannerid=10089&campaignid=2945&zoneid=2&loc=1&referer=http%3a%2f%2fwww.associatedcontent.com%2farticle%2f584031%2fhow_to_change_a_thermocouple_on_your.html%3fcontent_type_id%3d584031&cb=ebe6534afe avw.php?zoneid=2&cb=1721642411054458764&source=&n=a14de4a9&slice=-1060-&dma=-0-&cty=-us-&content_type=article&content_type_id=584031&category_id=6&key_ad=1045292919&site_id=1&ad_pos=2&key_page=1721642411054458764&ac_url=http%3a%2f%2fwww.associatedcontent.com%2farticle%2f584031%2fhow_to_change_a_thermocouple_on_your.html rather than installing a new gas hot water heater.

Begin this project by shutting off the gas control knob on your hot water heater. Once you are sure that the gas is off, you should use a wrench to remove the nut that attaches the thermocouple to the gas hot water tank. This nut should appear to be securing a piece of copper tubing or other type of tubing. With the nut removed, you should also pull down on the tubing, dislodging it from the thermocouple.

Sometimes there is another nut that attaches the end of the thermocouple to the pilot bracket, if this is the case you should unscrew this nut as well. You can slide it down the tubing and keep it there until you need to replace it.

With the nuts that were holding the unit in place removed, you should be able to slide the old thermocouple out of the brackets that hold it to the hot water heater. You should then take it to a hardware or home improvement store and find a suitable replacement. Then follow these steps to install the new part and fix the hot water heater.

To change the thermocouple, you should press the end of the thermocouple into the pilot bracket as far as you can. If you had to remove a second nut to remove the old thermocouple, now is the time to replace that nut securely.

With the thermocouple in place, you should connect the lead to the control unit. Use the nut you removed in the beginning steps to secure the lead. You should then tighten it at least a quarter turn with a wench to make sure the lead is securely attached to the control unit of the gas hot water heater.

Now that the new thermocouple is installed on your gas hot water heater, turn on the gas shut off valve that you turned off earlier. You should be able to relight the pilot and the functionality of your gas hot water heater should be restored.

Nov 22, 2010 | Air Conditioners

1 Answer

Flame goes on than out and keeps doing that wont stay lit!!


I'm assuming you're referring to a gas burner that supplements the heat pump. If the burner lights at all, The ignition system is working. If you need to reset it for it to relight, I would suspect the thermocouple. It detects the flame to prevent gas from pouring out of an unlit burner. If it malfunctions, the control thinks the burner didn't light and shuts down for safety.

Nov 26, 2009 | Weather King 10AJA6001AH Air Conditioner

1 Answer

Furnace runs about 1 minute, then total shutdown


What type of gas supply line do you have? Is it black pipe or copper? If it is copper, there can be a film like substance that builds up on the inside of the copper. The debris will the get caught in a pre screen where the supply enters the valve thus cutting the supply of gas to the unit. Also, the thermocouple may be bad. You didn't say that you replaced it. Try replacing it as well. Also, you could have a limit switch turning the system off and thus cutting the gas off completely but it is highly unusual for the pilot to be cut off as well unless the pilot is being blown out when the gas is shut off. Also, turn the unit to fan only without calling for heat. Using a flame of some sort, put it into each baffle of the heat exchanger. If your flame is being blown around in one of the baffles, then you have a hole in the heat exchanger and what is happening is that the roll out switch is cutting the unit off and the air still moving through the heat exchanger is blowing the pilot out. I have seen this actually happen. If your furnace is in excess of 15 years old, it does need to be checked for possible holes. If it is in excess of 25 years old, it is a huge possibility that the unit has already developed a hole. If you feel hair coming out of one of the baffles, then shut the unit down immediately and have it replaced!

Apr 05, 2009 | Air Conditioners

1 Answer

We have a whirlpool hotwater heater model #fg1404t3nv and we can not get the pilot light to stay lit. help please we need hot water and do not have the money to replace it


Fear not, unless you havewater leaking from the tank you won't have to worry with replacing it.

Heres how your heaters ignition system works.

The Pilot is lit, and the flame sensor detects flame and sends signal to the gas valve.The gas valve then sends gas to the burners and the burnes ignite.

If the gas valve does not recieve signal from the sensor it will not come on and it will shut off all gas to the pilot, and burners to prevent raw gas from dumping into your home.

If your system has a thermocouple, 99% change the problem is the thermocouple.

When I service a customers unit, I automatically replace the thermocouple because they are so notoirus for going bad.

You can buy one at Lowes for less than 10 bucks.

To locate the thermocouple, go to the gas valve, fint the small copper tube (about as thick as a pencil lead) and follow it to the pilot. The sensor will be slightly larger in diameter and about 2 to 3 inches long.

You can try cleaning the sensor with steel wool, but usully they just need to be replaced.

To replace it, turn off the gas, unscrew the nut holding the tube in the gas valve, and disconnect the sensor from the ignitor/pilot assembly. Make sure your new T-couple is long enough, as the come in different lengths, you can simply coil the extra length up out of the way near the gas valve.

Install the new one as you removed the old one.

Relight pilot, be sure to hold the button down long enough, and enjoy your hot shower!

If you have any other problems, let me know, and I will be glad to help you.

Please don't forget to rate this solution.

Dec 26, 2008 | Air Conditioners

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