SOURCE: Dyna-glo parts
thermocouples you can buy from any heating spares oulet or national energy a hone well is most common for useing as a replacement
SOURCE: Heater will not fire.
The TH wires are either end of the THermostat circuit, otherwise know as the safety circuit. Something in that circuit is open and not allowing the gas valve to open and burners ignite. The most common is the pressure switch but it could be any one of the 8 or so switches that must all be closed in order for the heater to fire.
SOURCE: Natural gas hot water heater not stying lit
Probably a bad solenoid in the gas valve. Higher voltage of a new thermocouple keeps it open longer but it still fails over a period of time. Look into a new gas valve for the water heater.
SOURCE: pilot light on water heater wont stay lit
The thermocouple has failed. It is the temp probe that goes from the pilot lite burner area to the control valve. Go to your local plumbng repair shop and buy one. Most appliance parts stores have them also. Take the old one with you and they will hook you up with an exact replacement. They are not that hard to change. Usually a nut or 2 screws in the temp bulb area at the burner end and a nut that threads into the control valve.
Make sure before you install the new one that the area where it mates to the gas valve is clean. Should be about a 20 min job including clean up with replacement parts in hand.
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