Question about Rheem Tankless Water Heater Manifold Control Box

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40 gal 12yrs old ,has evac sys.flame comes on for sec.,shuts down

40 gal 12yrs old ,has evac sys.flame comes on for few sec. then shuts down Thanks (Rheem) This is a tank sys.Ignor posted part no.

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It will cost to much to repair , the tank is at the end of its life, I rscommend getting new tank.

Posted on Jul 29, 2012

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Most likely a flame sensor problem.remove fl sensor , clean with steel wool or fine emery cloth,replace and it should solve yor problem

Posted on Jul 21, 2009

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1 Answer

Blower vac runs a few sec. then stops


Check age of gas. Cannot be more than 30 days old. Make sure to use fresh gas w/synthetic 2-cycle oil @ 40:1 ratio (1 gal.) Gas to 3.2 oz. Oil). Do not use old or stale oil/gas mixture. Always use the proper oil/gas mix. If you do not, your engine will suffer rapid, permanent damage. May need to clean or replace carburetor.

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Reliance 40 gal 32,000 btu pilot light not staying on


Replace thermocouple--its the small copper rod that comes from flame to gas valve--usually 24-36''long be gentle with new one,home depot or hardware will have Rich- ps make sure you hold pilot button for about 30 sec. when relighting

Jan 30, 2011 | Reliance Water Heaters

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Inductor blower comes on and runs then the ignitor glows flame comes up and burns for approx. 10-15 sec then goes out then fan comes on. Model number is PBKMLB12N0B0F I believe this is a goodman furnace.


I cleaned the sensor that was at the the right further most burner on my Goodman and it worked. got the answer to my problem here at fixya. My burner flame only lasted 5 secs before it shut off. Thanks to all who took the time to send me a response.

Nov 13, 2010 | Goodman Heating & Cooling

1 Answer

Model 640HORT Reliance 606 40 gal LPgas came to cabin, water cold, lit; ran for 4 hours, flame went out, burner won't come on.


It does sound like a weak pilot thermocouple. Change the thermocouple first. Make sure you have an adequate supply of propane serving the water heater. If it still works for a while then completely shuts down, you will need to replace the control valve. Call Reliance and see if the unit is still under warranty, you may be able to get free parts.

Sep 11, 2010 | Reliance & LP Gas Water Heater Control

1 Answer

It taking too long to dry. I checked for blockage in the exhaust and lint and everything was ok.


Pop open the peep hole at the front bottom and watch the igniter glow until it ignites the gas. Are the burner flames a strong blue flame? Watch it for a little while. Does it stay lit for a few secs and shut down and then try to cycle back on? By the way, how old is this dryer?

May 20, 2010 | Fisher and Paykel DGGX2 Dryer

1 Answer

I have a freezer that does not work it clicks on for a few sec then cuts off what could be wrong


The clicking is the electronic ignitor trying to light the gas.
Either it's not getting any gas to light , or the flame sensor is not telling the computer that there is flame , so it shuts down the gas.
Most fridges have a small shut off right at the gas valve in the back of the fridge , it might be turned off. Put your ear up to the back cover of the fridge , if you hear it sparking and then you hear flame but it goes out after a few seconds , than it is the flame sensor. If you never hear the flame blowing , than it is not getting gas. Could be several different reasons. If you have disconected your tanks , maybe the gas has just not made it to the fridge yet. Newer ignitors try 3 times and then shut down if no flame is detected. Old ones only try once.

Apr 27, 2010 | Thetford Norcold RV Cooler/Freezer

1 Answer

My atwood 6 gal water heater gas with electric light comes on and runs for a few seconds then goes out,if i turn the switch on several times it will stay on.can you help with this problem? thanks


Try cleaning the electrode that sits in front of the flame, as well as adjusting it,if necessary to make sure it is in front or at least in position that it senses the flame well.

Feb 16, 2010 | RTO Atwood Water Heater - 6 Gal LP

1 Answer

Fan comes on glow plug lights up but no flame.3 sec. fan shuts down.Have clean all lines, tips everything. Model 60 Reddy used very little in ten years.


this have a flame controler, if the flame didn't goes on in few seconds the unit automatically stops. back plug and start again, if not star after tree times check the flame control thermocuple, or get the unit in service to fix it.

Feb 14, 2010 | Reddy R60A Utility Heater

2 Answers

Lennox furnace 17 yeanrs old. flame comes on and the shuts down sometimes right away some times in a few minutes. We have the furnace go down to 58 at night. It takes all day to get back to 67.


Sounds like a dirty flame sensor.
Also 9 degrees is a large swing to recover. Most specialist will advise no more than a 5 degree set back, otherwise recovery time eliminates any savings you may achieve.

Dec 05, 2009 | Dayton (3E407) Heater

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