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I have an Pro Com MD 300TGA and cannot get the main burner to ignite,replaced thermo coupler, pilot light works runs on natural gas.

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Posted on Jan 02, 2017

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SOURCE: replaced thermo coupler on ricmond hot water heater...light pilot.light main burner..15 seconds later both flame out

if you just light pilot will the pilot stay lit for 5 minutes or more?

Posted on Sep 08, 2015

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SOURCE: richmond gas w/htr. light pilot and main burner 15 seconds both flame out...relight'll stay on five minutes .flames thermo coupler

Make sure the thermocouple is deep into the blue part of the flame. If it is good, then the only part left is the defective main gas valve.

Posted on Sep 08, 2015

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Richmond gas w/htr. light pilot and main burner 15 seconds both flame out...relight'll stay on five minutes .flames thermo coupler

Make sure the thermocouple is deep into the blue part of the flame. If it is good, then the only part left is the defective main gas valve.

Sep 08, 2015 | Water Heaters

1 Answer

I can get the pilot light to stay on but main gas burner won't fire up

If the pilot is lighting and the thermo couple is in the fire and turned red and the pilot still does not stary on change the thermo couple. They are available in any home improvment store.

Nov 04, 2014 | RTO Suburban Rv Water Heater Dsi Gas Valve...

1 Answer

Hot water heater will not ignite

LP or natural? Got gas? Is there anything in the house gas? Stove, etc? Age of heater? The control can be replaced under warranty no problem, would be easier to check the heat switch, I have forgotten what it is called, just a piece of copper wire that touches the pilot, when it reaches a certain temp it opens the gas valve stating the flame, If it is shot, and they go bad, it will not let the burner ignite. Safety feature on all gas appliances. I had one go bad, went crazy tying to fix it, just a little wire, then got a new one in the mail free from the company, and put the old one back in with a new wire, no problem. Check it out. Thermo coupler maybe??

Mar 13, 2012 | Water Heaters

1 Answer

Pilot goes out when dialed back to on position.....replaced thermo couple so I assume it's the gas valve (MPD91043) that need replacing??? Someone also mentioned a "motherboard", which I...

no I dont think you have a mother board. If there wasone it would be in a box of some sort on the top or right near the top mounted on the side.

If you replaced the coupler, I would say the gas valve is bad. Go to you local supply store and get a new valve. you should have 3 connection on the valve, the main gas feed and the main burner and your coupler.

Make sure you turn off the water at the main, drain it all down and when you have all the connection moved get a large channel lock or pipe wrench and turn the valve counter clock wise use tape or dope on the section that goes into the tank and tighten it up, hook up your other pipes and test for gas leak with soap and water.

Make sure when you buy the valve you get a match to the kind of gas you have natural or L P one will not work with the other.

OH check for gas leaks

Best of luck Tom

Sep 08, 2011 | RTO Water Heaters

1 Answer

Pilot light will not light

If your pilot on your gas water heater will not stay lit you need to take one step at a time.

Let's look at how you tried top light it. Turn the gas valve to the off position and then move it to the pilot position. If you can see inside under the heater and there is no glass view window you need to take a lighter or a match on an extended stick so the flame can sit right under the pilot tube. Push down on the red button and then the gas should light on the pilot burner. Hold the button down for a FULL 60 seconds.

Then slowly release the red button the main burner should then come on. Now if the pilot flame goes out right away as you're releasing the red button you have one or two more things you need to look at.

1st would be to replace the thermo coupling. You have to remove the whole burner tray to do that. If that does not work then the gas valve is bad and you need to replace it also. Make sure that when you buy a new gas valve you match up the gas type Natural gas to L P gas. They must match with the gas feeding your house or it will never work,

Thanks and best of luck


Sep 08, 2011 | Rheem Water Heaters

2 Answers

Pilot wont stay lit

Check the thermocouple,Its is a flame senser.It will not stay lit if it is bad.

Oct 04, 2009 | Water Heaters

1 Answer

The pilot won't stay lit!! Before when this happened, we turned the gas down. It seemed it would blow itself out. doesn't want to light at all.

i should have seen that, sorry.
TDoes it go out when you turn the main control to on? If so, The thermo coupler appears to be not working. The thermo coupler is that bulb that is at the tip of the pilot flame. and has a small tube going to the main valve. It controls all the gas and shuts everything off if the pilot flame goes out, including the gas to the pilo. That is why you have to push the button to light the pilot. Ot bypasses giving the pilot some fuel. to lite. As mebtioned, if the thermocoupler goes bad nothing will work so I think changing it will solve your problem. If the coupler is not in the flame, try adjusting so it is and see if that helps Good Luck -Ned-

Sep 19, 2009 | Water Heaters

2 Answers

Burner won't start

try using a jumper wire across the poles of the thermostat, if this works the thermostat is bad. if this does not work you may have a defective main gas valve

Jul 08, 2009 | RTO Atwood DSI-RV Water Heater-6 Gallon

1 Answer

No hot water, pilot light lights but no burner ignition

Thermo coupler may be defective. it controls the main gas valve by closing main if pilot is out. make sure thermo coupler bulb is positioned over and near tip of pilot flame, but not in the flame. Thermo couplers are inexpensive and easy to change out.

May 05, 2009 | Bosch & Tankless LP Hot Water Heater

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