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Replace tc and safty valve J

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Posted on Nov 27, 2014

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My heater will not stay lit. I changed tanks but it still goes out after a few minutes


Have you tried replacing the Thermocouple (TC)?
Here is a page I wrote on TC's:

One possibility is that the Thermo Couple is beginning to fail'
What is a Thermo Couple? (TC)
The Thermo Couple (TC) is a small Rod-shaped device with a couple wires coming out the bottom.
The TC actually generates a small electrical current from the heat of the Pilot.
This electrical current is sensed by the control board, or the Main Gas Valve.
As long as there is a pilot, it is safe for the Main gas valve to open, and admit the large amount of gas into the heating burner.

Now-- What helps this TC work the best?
It needs to be just at the edge of the pilot flame--- Not too much in the flame, or the resulting poor combustion of the pilot flame, results in soot forming on the TC-- which insulated the TC from sufficient heat.
Obviously the TC has to be clean (of soot) in order to receive enough heat, to generate the needed voltage to tell the valve that it is safe to open.
And age does deteriorate the TC-- some last a few years, but that is about the end of life for most.
Replacing requires getting down where the TC is, and with a screw driver (usually)-- loosening the bracket that holds the TC. Pay attention to where the wires are routed, and any polarity indicated on the old wires, and duplicate on the new one. Duplicate routing, and polarity, and position the new TC at the edge of the pilot flame.
Pilot flame is maintained by pushing some over ride button-- for a minute or two, until when you begin to release the button, you can feel that the voltage generated by the TC is now holding the pilot valve open, instead of your pressure on the 'start' button.

Any further Questions, let us know..

Mack B

Jan 28, 2011 | Heating & Cooling

1 Answer

Pilot ignites but goes out when I turn up the thermostat


If you have a standing pilot, then you likely have a ThermoCouple (TC)
Here is a solution I wrote for checking, adjusting and replacing aTC:

One possibility is that the Thermo Couple is beginning to fail'
What is a Thermo Couple? (TC)
The Thermo Couple (TC) is a small Rod-shaped device with a couple wires coming out the bottom.
The TC actually generates a small electrical current from the heat of the Pilot.
This electrical current is sensed by the control board, or the Main Gas Valve.
As long as there is a pilot, it is safe for the Main gas valve to open, and admit the large amount of gas into the heating burner.

Now-- What helps this TC work the best?
It needs to be just at the edge of the pilot flame--- Not too much in the flame, or the resulting poor combustion of the pilot flame, results in soot forming on the TC-- which insulated the TC from sufficient heat.
Obviously the TC has to be clean (of soot) in order to receive enough heat, to generate the needed voltage to tell the valve that it is safe to open.
And age does deteriorate the TC-- some last a few years, but that is about the end of life for most.
Replacing requires getting down where the TC is, and with a screw driver (usually)-- loosening the bracket that holds the TC. Pay attention to where the wires are routed, and any polarity indicated on the old wires, and duplicate on the new one. Duplicate routing, and polarity, and position the new TC at the edge of the pilot flame.
Pilot flame is maintained by pushing some over ride button-- for a minute or two, until when you begin to release the button, you can feel that the voltage generated by the TC is now holding the pilot valve open, instead of your pressure on the 'start' button.

Any further Questions, let us know..

Mack B

Jan 26, 2011 | Cozy (W352E) Heater

1 Answer

Brand new heater installed according to manual yet unit shuts off randomly after running - some times in less than a minute, sometimes after a day and a half of running fine. How do you test the...


I doubt if the ThermoCouple (TC) should have failed this soon!
However-- Here is a page I wrote to help others trouble-shoot and replace the TC

One possibility is that the Thermo Couple is beginning to fail'
What is a Thermo Couple? (TC)
The Thermo Couple (TC) is a small Rod-shaped device with a couple wires coming out the bottom.
The TC actually generates a small electrical current from the heat of the Pilot.
This electrical current is sensed by the control board, or the Main Gas Valve.
As long as there is a pilot, it is safe for the Main gas valve to open, and admit the large amount of gas into the heating burner.

Now-- What helps this TC work the best?
It needs to be just at the edge of the pilot flame--- Not too much in the flame, or the resulting poor combustion of the pilot flame, results in soot forming on the TC-- which insulated the TC from sufficient heat.
Obviously the TC has to be clean (of soot) in order to receive enough heat, to generate the needed voltage to tell the valve that it is safe to open.
And age does deteriorate the TC-- some last a few years, but that is about the end of life for most.
Replacing requires getting down where the TC is, and with a screw driver (usually)-- loosening the bracket that holds the TC. Pay attention to where the wires are routed, and any polarity indicated on the old wires, and duplicate on the new one. Duplicate routing, and polarity, and position the new TC at the edge of the pilot flame.
Pilot flame is maintained by pushing some over ride button-- for a minute or two, until when you begin to release the button, you can feel that the voltage generated by the TC is now holding the pilot valve open, instead of your pressure on the 'start' button.

Any further Questions, let us know..

Mack B

Jan 26, 2011 | Heating & Cooling

1 Answer

Pilot will light but can't get burners to fire. Replaced thermostat and even bypassedit at one point. Any ideas?


Most heaters have a Thermo Couple (TC)-- is that what you have?

One possibility is that the Thermo Couple is beginning to fail'
What is a Thermo Couple? (TC)
The Thermo Couple (TC) is a small Rod-shaped device with a couple wires coming out the bottom.
The TC actually generates a small electrical current from the heat of the Pilot.
This electrical current is sensed by the control board, or the Main Gas Valve.
As long as there is a pilot, it is safe for the Main gas valve to open, and admit the large amount of gas into the heating burner.

Now-- What helps this TC work the best?
It needs to be just at the edge of the pilot flame--- Not too much in the flame, or the resulting poor combustion of the pilot flame, results in soot forming on the TC-- which insulated the TC from sufficient heat.
Obviously the TC has to be clean (of soot) in order to receive enough heat, to generate the needed voltage to tell the valve that it is safe to open.
And age does deteriorate the TC-- some last a few years, but that is about the end of life for most.
Replacing requires getting down where the TC is, and with a screw driver (usually)-- loosening the bracket that holds the TC. Pay attention to where the wires are routed, and any polarity indicated on the old wires, and duplicate on the new one. Duplicate routing, and polarity, and position the new TC at the edge of the pilot flame.
Pilot flame is maintained by pushing some over ride button-- for a minute or two, until when you begin to release the button, you can feel that the voltage generated by the TC is now holding the pilot valve open, instead of your pressure on the 'start' button.

Any further Questions, let us know..

Mack B

Jan 25, 2011 | Heating & Cooling

1 Answer

Pilot light will not stay lit. I have tried holding the button down for 1 min, 2 min, 3 min and once the button is released the flame goes out


Is the pilot light FLAME touching the 'ThermoCouple'?
(This is a little rod-like device, that generates a signal voltage,)
This signal tells the Gas valve that it is safe to let the main gas in to the burner.

This ThermoCouple might be dirty-- or sooted up-
or it might need replacing.

Try cleaning the surface of the TC first--
Then--Try adjusting the discharge of the pilot, so it positively heats the TC

Does that allow the Gas valve to open now?

If you want to try changing out the TC-- take the model and information off from the gas valve, and the heater-- possibly your local hardware will have Thermocouples?-
If not-- yo may have to call a service company-- see if they will sell yo one..

Let me know where you want to go next with this trouble shooting process.

Mack B

Jan 14, 2011 | Heating & Cooling

1 Answer

I have an H250 NG and when I light the pilot it goes out when I release the pilot button on the gas valve?


The first thing That comes to mind is a bad pilot generator or thermopile. This makes a small half volt charge that energizes the magnets that open the two stages in the gas valve. Next would be a bad gas valve itself. You will need a milivolt meter to check both of these. Lastley is the safty circut. This is the string of switches that can shut the heater down if problems exist. Their are two sets of wires connected to the gas valve. One set goes down to the pilot, this is for the pilot generator. The other set is the safty circut. If you remove these wires and the pilot lightes and stays lit the problem is in the circut. Still no pilot then it is in the pilot or valve. Good luck.

May 28, 2010 | Hayward 250kbtu Ng Pool Heater - Inground

1 Answer

Can't light my Raypak Pool Heater.


Often you can see the pilot if you use a small mirror. With the button on the gas valve pushed down you should get pilot. Once the pilot is lit it warms the TC(thermocouple) creating the static charge to open the gas valve on it's own. The TC is set in the pilot assembly. It will be a small tube like piece with the wires coming from it. Some times you can pull and replace it but I will usually get the whole pilot assembly and just replace that. It will probally be rusted and can be cloging the tiny orface on the pilot itself.
If you have a milivolt meter you can check the TC by pulling the wires that come from it at the gas valve and with the button on the gas valve pushed in and a good flame you should get 500-700 MV from the TC. This is 1/2 a volt+ so you will need a MV meter. But this will tell if your TC is bad or if your valve is bad.
Good luck.

May 12, 2010 | Raypak Free Hydraulic Lift Gate Delivery -...

1 Answer

Too much pressure, plastic hex.bolt gone, safty valve spitting


Check the P.stat and the level probe. After those are checked, you will also have to replace the safety.

Jan 18, 2010 | Rancilio S24 Espresso Machine

1 Answer

I have a whirlpool estate gas dryer. I am not getting 110 volts to the ignitor. Therefore the ignitor won't glow. any advice? John


just replace the ignighter it dont get 110 its the way its designed for the safty valve if it dont glow 99percent of the time its bad and even if it does glow it still can be bad as its has to use so many amps for the safty valve to open

Jul 13, 2008 | Dryers

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