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Wall heater I have a Pro Com MD 300TGA and cannot get the man burner to ignite,replaced thermo coupler. Pilot light works fine and it runs on natural gas.

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Posted on Jan 02, 2017

  • 3 Answers

SOURCE: thermo coupler on all the time, push in button, shuts off gas

Bad Safety valve. (valve w/red button). Thermocouple keeps the magnet open to keep pilot and so gas can flow to burner. Make sure pilot is clean and strong and hitting thermocouple. If it doesnt stay lit replace Safety Valve.

Posted on Dec 17, 2008

  • 69 Answers

SOURCE: wall heater burners wont ignite

you may have a bad gas valve

Posted on Dec 19, 2008

  • 10865 Answers

SOURCE: Propane patio heater ignition problem

I would change the thermocouple and here is why:

The thermocouple is the pilot's, well, co-pilot! It is the electronic device that senses if the pilot flame is hot enough to sustain burning the gas fuel from the burner. If the thermocouple thinks it's safe, then it keeps open the main gas valve located in the pilot assembly. If the thermocouple does not sense enough heat from the pilot flame (such as when the pilot is out), then the thermocouple shuts off the gas valve to the burners.
How the Thermocouple Works
So what is this thing and how does it work? Well the thermocouple (technically called a thermocouple junction) is a device that contains two metal wires welded at the ends and placed inside a protective metal case. The thermocouple sensor is found at the business end of the pilot flame and is designed to be placed in the hottest part of the flame. The other end is connected to the pilot valve body. As the thermocouple heats up, it produces a small amount of electricity and when it gets hot enough from the pilot, send a signal to open the gas valve by using a solenoid operated by a 24 volt transformer. The thermocouple calls the shots, and by converting heat to an electrical signal, it allows the gas valve to open or close. Once the gas valve is open, gas is then constantly supplied to the pilot and as required for the gas burners (as called for by the thermostat). If the pilot goes out, then the thermocouple gets cold and produces no electric signal to open the gas valve's solenoid and the gas valve shuts off the gas supply to the pilot and burners

Posted on May 27, 2009

  • 139 Answers

SOURCE: pilot will light but main burner will not light

if burner lights after jumping valve you have something wrong in thermostat loop. disconnect the 2 thermostat wires on gas valve and use multimeter on continuity setting. if all wires ,connectors and components are good,you will get a tone.since you have jumped out each component in thermostat loop with no success ,i would suspect a bad wire or oxidation on a terminal .

Posted on Sep 24, 2009

john224
  • 1378 Answers

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.

Posted on Dec 17, 2009

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