Question about Mr. Heater (F274825)

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MH 18 B wont stay lit

Will lite and burn for about 20 minutes then go out. Will relite later and burn again for about 20 min. ???

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  • 88 Answers

Sounds like you have a limit safety issue, the unit is over heating and kicking out on high limit, or the limit is weak, either way you should look into replacing the limit, hope that helps

Posted on Jan 20, 2009

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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.

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