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My Mr Heater, Big Buddy will light but when I move it to high it goes out. It works just fine on low for a while but when you go to high it goes out. I have cleaned the pilot and the lines.

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6ya6ya
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Posted on Jan 02, 2017

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Buffalo12980
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SOURCE: Pilot light lit but no heat

the pilot's millivolt generator may be at fault.  if you have a meter that is capable of measuring a very small DC voltage, connect it up to the very end of the thermocouple and the copper cappillary. the thermocouple has a welded bead at the very end inside that generates a small DC voltage. Same principle of a J-K thermocouple. Iron constintan  - two dissimiller metals where joined together produce a voltage when heated.  the thermocouple actuates a millivolt electromagnet inside the valve to keep the valve pellet open.  no voltage there it won't actuate the electromagnet.

Posted on Oct 15, 2007

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Buffalo12980
  • 625 Answers

SOURCE: MR. Heater Portable Buddy model MH9B

the mr heater series units have a millivolt generator connected to a very small sensitive electromagnet in the valve body. inside the generator is a small insulated wire connected to the very tip of the generator. that and the outside copper tube forms the j-k junction. at the other end, the part that goes into the valve is a silver button and a gland nut. this forms the other part of the electric circuit. the inside of the valve has a spring and an iron slug with a rubber pad. the slug gets sucked into the electromagnet when the magnet is operating and holds the pad off its seat allowing propane to go through the regulator and valve. change out your generator and I'm sure your problems will be solved. mr heater has a web site.

Posted on Nov 04, 2007

Buffalo12980
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SOURCE: Mr. Heater Buddy Portable Problems...

ok, your unit must be propane. look on the back where the propane line feeds the nozzle. there should be a very small copper line with two spade connectors on it. this is your millivolt generator line. with a flame at the nozzle the generator makes a very small electrical current which feeds to the main valve and keeps it open. take a piece of wire and jumper these two spade connections together and try lighting the unit again. if it stays on, the hi limit is shot. you can get by with the connections jumped out, you just don't have the safety margin if it were connected. IF with the spade connections jumped out the unit still shuts off, the generator tube needs to be changed.

Posted on Dec 26, 2007

  • 1 Answer

SOURCE: Mr Buddy Heater Flameup on ignition

It sound like the pivot inside the regulator is damaged. I think that you will need to replace the regulator.

Posted on Jan 05, 2009

  • 182 Answers

SOURCE: mr. buddy heater- pilot light goes out when i

would try to replace the thermocoupler for the pilot light and this should cure the problem.

Posted on Dec 22, 2010

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1 Answer

We bought a big buddy 2 days ago and now it wont work.


Push red button down to start, maybe 3 times, then push red button down HALF way down then turn to low.
IT COULD BE YOUR PROPANE TANK, got a new one but had problems, so I left it on all night and it lit in the morning.
BUT when I got it filled the next time the man said the stem in the tank might need to take it outside and bang the tank several times, stem in the top gets stuck a lot he said.
But last is to take the tank outside and use a flat head screwdriver and turn the screw? on the side where the hose would be connected to let some out.

Feb 05, 2015 | Mr. Heater Big Buddy Heater

1 Answer

Big buddy Heater - 20 lb tanks won't keep pilot lit,


I had the same problem I called tech support and they said to turn the valve on the 20# cylinder on very slowly for the first 1/4 turn then all will be fine. There is an excessive flow check valve that causes restricted flow when the valve is opened quickly----------mine works fine now

Apr 09, 2013 | Mr. Heater Mr Heater Portable Buddy...

1 Answer

Hi, when on high it will run only a few seconds


has to do with gas pressure on high your losing heat to thermocoupler causing ignition to fail

Sep 08, 2017 | Mr. Heater Big Buddy Heater

1 Answer

When mr heater portable buddy is on for about 30minuts control valve sticks on high and even on low when heater cools moves it moves freely


The solution is to contact Mr. Heater tech support. Once I made contact with them they took my complain very seriously and wanted immediately to inspect my unit. They issued a FedEx Pickup request to take my unit back to Ohio. They're sending me a replacement unit which they promised to test before send it it me.

Jul 16, 2012 | Mr. Heater Mr Heater Portable Buddy...

1 Answer

When I press down and turn the know the pilot lights but as soon as you let up on the knob to turn it there is a click and the pilot light goes out.. This is on my Mr. Heater Big Buddy


When the pilot lights continue holding the button down for a full minute and then release. It should stay lit then to allow you to turn it to the on position. If the pilot will not stay lit after holding it for the full minute, then the thermocouple will need to be replaced.
Hope this helps.

Sep 16, 2011 | Mr. Heater Big Buddy Heater

1 Answer

My Big Buddy heater inconsistently works on high. The low and medium settings work fine (single ceramic element) but when I turn it to high (activating the second element) the element does not fully light...


I did some research on these units-- I pass them on to you-- Do these help?

your Mr. Heater the model that uses two small one pound cylinders or you have the choice to hook it up to a single larger tank? if so, you must use the special filter connected to the Mr. Heater and then your hose to tank.
This happened to me and after I hooked up the filter my problem was fixed.
Ron
large and sealed of an area are you using it in? I ask because those units have a low oxygen sensor which will shut it down if there is not enough oxygen in the space.(kinda prevents that pesky suffocation thing). Otherwise if using it in larger cold spaces, the issue is can be from the smaller tanks. As mentioned above, a larger tank can solve this, because these units have a fairly good input rate, which will cause the smaller tanks to freeze, and lower the propane temperature and evaporation rate, basically runs out of gas until the tank warms back up.
just one new cylinder, it will run on just one, to verify a problem with the cylinders. Also it could be the pilot light, sit and watch the pilot light to see if it goes out for some reason. If it does the heater will shutdown automatically, but you already know that.


Let us know if we can help further?

Mack B

Jan 17, 2011 | Mr. Heater (F274825)

1 Answer

One side glows like a champ. The other side, dedicated for High setting, pooffs when I turn it to high, then kind of fickers and barely glows. I have a fuel filter and a six foot hose off of a 20#...


dirt , foriegn material,spider web in gas feed line to the right side ceramic element of mr heater big buddy. take plastic back of heater
off, many #1 philips or smaller screws. find large air induction holes
in gas feed line to right side ceramic element and blow out with compressed air and fine tiped /straw tipped air blow gun.
straw tipped air blow gun is a better tool for this.
reassemble & try lit mr heater again.
If it dont work after air blow gun the gas feed tube, you didnt get the gas feed tube cleaned out ,***** & span (something still in there ) and will need to disassemble the gas feed tube and inspect for foreign material blocking the gas flow.

If this dont work,need to take the gas feed line off the gas valve attached to Mr. heater red knob. red knob just pulls straight out, might need pliers to grab red knob.
check gas valve output for dirt etc that stop gas from getting through. check inside the gas line to the ceramic burner for dirt,
foriegn material- that stop gas from flowing through strong.

any stopage of gas flow , even a slight stopage or dirverting of the gas flow, spider web is common, will stop ceramic element from burning properly.

needs to be clean ,like a carburator.

Dec 27, 2010 | Mr. Heater Big Buddy Heater

1 Answer

Big buddy heater caught on fire


HI try mr heater wed site there has been some recalls on these heaters , it sounds like you had too much pressure going to the heater , or the gas valve was faulty, hope this helps

Feb 09, 2010 | Mr. Heater Big Buddy Heater

5 Answers

Stays lit for 25 minutes and shuts off


How large and sealed of an area are you using it in? I ask because those units have a low oxygen sensor which will shut it down if there is not enough oxygen in the space.(kinda prevents that pesky suffocation thing). Otherwise if using it in larger cold spaces, the issue is can be from the smaller tanks. As mentioned above, a larger tank can solve this, because these units have a fairly good input rate, which will cause the smaller tanks to freeze, and lower the propane temperature and evaporation rate, basically runs out of gas until the tank warms back up.

Jan 19, 2009 | Mr. Heater (F274825)

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