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My therma gas heater will not stay on . It ignits correctly, it also steps up to 3 pannels burning correctly, but you have to hold the grey gas button down for it to work. The pilot-type flame will not stay on. I think the gas flow to the pilot flame cuts off when you let the grey gas button up, when it should stay on. Where is the fault and what part do i need? Thanks Roy

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You need to replace the thermocouple. This is a small metal rod that is positioned in such a manner that when the pilot light is burning, the flame is contacting the thermocouple. When heated by the flame, the thermocouple produces a very small amount of electricity that it sends to the gas valve. The valve then interperets the electricity as confirmation that the pilot is burning and it is safe to conitinue delivering gas. Thermocouples wear out and stop producing power. The gas valve thinks that the pilot has gone out and thus turns the gas off for safety.

Thank You,
Chillmaster

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Posted on Jul 05, 2008

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When the gas was turned OFF, air got in the line(s) and created an air pocket. This air will need to purged from the system, before the heater will light. It only the shutoff valve on the gas line to the heater was turned OFF, it will be easier to purge. If your Rinnai heater has manual ignition rather than electronic ignition. Holding the control down in the Pilot position, will eventually purge the air. If you have electronic ignition, continually trying to light the unit will do the same thing, but take longer to accomplish. Consulting your Rinnai will also help you with this situation.

Hope this helps you and thanks for choosing FixYa.

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My fathers Bosch water wizard tf 250 will not start. the water will flow but no gas will not ignite or come through the pipe to the heater. the gas bottle is full. thanks Dave Tooley


Dave, make sure that the gas valve on the Propane tank, is fully open and that the inline gas shutoff valve near the heater is turned ON. Those are the basic two things that would prevent the gas from flowing thru the gas line, to the heater.

If the above valves are ON, the problem then lies with the gas control valve on the water heater. If it has pilot light that has to be lit, make sure that the heater's gas control valve is properly in the PILOT Position, before attempting to light it. It must be able to be pushed ALL the way in and you should feel strong pressure pushing back at you (other than spring pressure). When you feel that, it's in the PILOT Position and ready to be lit. Once it's lit, continue to hold the Pilot Button in for 1 minute, then release it. If the Pilot stays lit, turn it to the ON Position.

Hope this helped you to troubleshoot and solve the problem. Please let me know. Thanks.

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1 Answer

Once I press the button to start the heater must wait a good 30 seconds or more before it stays lit when button is released.


That's normal. It's the correct way to allow the the Thermocouple and/or Thermopile to fully heat up.
If you have been turning the pilot light OFF after each use and then relighting it when you want to use the heater, that's really not necessary. Leaving the pilot lit during the heating season is a better way to go. If you think you're saying gas by turning the pilot light OFF and then relighting it again, when you want heat, you're really not saving a significant amount of gas or money. The pilot burning continuously, uses very little gas.

Hope this helped you. Please let me know. Thanks

May 16, 2011 | 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

Hot water heater is natural gas type gas is staying on all the time burning even when water is hot it continues to burn. Not hot water tank is over 10 years old should I try to repair or just replace???


The thermostat is what is out of calibration...this is built into the gas valve. Unfortunately the part cost almost what a new tank does. My opinion is to replace.....today gas valve....another 8 years the tank...

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Delayed ignition of a Ruud high efficiency upflow 90 plus propane


It sounds like the first thing to do is have burners and pilot cleaned and adjusted so ignitor and pilot flame is close to main burner ignition rail.

The "whoosh" is due to delayed ignition because the pilot flame does not come in contact with main gas.

One more thing that should be tested is the gas pressure and combustable air mixture to be sure it is correct.

It is always best to have a qualified technician do this for you, In many areas the gas supplier with check and safety test this for you.

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1 Answer

The heater in my central heating is not getting turn on but the fresh air and cooling is getting turn on


Check the pilot light.Older standing pilot systems use thermocouples to verify the pilot is burning before the gas valve opens.If the pilot wont stay lit replace the thermocouple.
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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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