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Mr heater will not stay lit - Heating & Cooling

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A faulty thermocouple?

There's a lot of model specific information on their site:

Posted on Feb 02, 2018


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Posted on Jan 02, 2017


Mark Egan

  • 1214 Answers

SOURCE: Is it o k to bend the thermocouple tip. The only

Bending it will ruin it. You need to find out why the pilot flame is not as strong as it should be.

It is usually caused by bugs or spiders having gotten into the small air mix jet of the pilot assembly and died or built a web or, there is some dirt from the fuel that is partially clogging the fuel tube leading up to the pilot assembly, or plugging the orifice.

Posted on Dec 14, 2009

Testimonial: "worked perfectly"


  • 1 Answer

SOURCE: my mr heater mh9b won't stay lit

my mr heater mh9b won't stay lit. The pilot flame starts acting wierd and making noise after ten to fifteen minutes of being lit and then goes out completely. It can be re-lit but goes out again in a bit. Any suggestions?

Posted on Dec 14, 2009


Duane Wong

  • 6826 Answers

SOURCE: Mr. Heater Buddy won't stay

Which model do you have?
If Spark electrode does not produce spark.
• Spark electrode broken - replace ODS (Oxygen Depletion Sensor).
• Igniter wire may not be attached to spark electrode.
• Igniter wire damaged - replace.
• Piezo igniter defective - replace control valve.

If Spark electrode produces spark but pilot does not light.
• No gas to heater - install disposable cylinder or connect hose and filter where required and turn on valve at remote cylinder.
• "PILOT" position not properly aligned - turn gas control knob to "PILOT" position and depress.
• Pilot is blocked from spider web or dirt - clean pilot, see MAINTENANCE.
If Pilot flame does not stay lit when knob is released.
• Control knob in "PILOT" position not completely depressed or held in long enough to purge air from lines.
• Pilot flame not surrounding thermocouple - clean pilot, see MAINTENANCE.
• Pilot Assembly defective - replace.
• Tip switch wires disconnected - connect.
If Main burner does not ignite.
• Main burner orifice is blocked - clean burner, see MAINTENANCE.
If Heater keeps shutting "OFF" during normal operation.
• Pilot is blocked - clean pilot, see MAINTENANCE.
• Provide minimum fresh air opening of 9 square inches (example 3" x 3" opening).
• Tip over switch activated from bumping heater. Re-light.
• Regulator defective - Replace regulator.
• Internal contamination - Replace control valve and regulator.
• Call Technical Services for additional information.
One can ask Mr. Heater a question at the following website:

Posted on Nov 06, 2010


Sudeep Chatterjee

  • 3267 Answers

SOURCE: Pilot won't stay lit on mr heater vent-free propane heater

You should contact whoever sells you propane. They may be able to offer help or advice without needing to send a technician. Here\'s a little background info I\'ve picked up since owning some Empire Direct Vent propane wall heaters. According to me, try these steps first.

Gas appliances have a valve in them with three positions. Off, On, and Pilot. Now, gas is a relatively dangerous substance, so you wouldn\'t want it to come flowing freely in your house if it wasn\'t being burned off. So, any appliance like a furnace or a water heater that runs automatically (as opposed to, say, your oven) has a safety device. It\'s an electrical system within the heater that works to ensure gas is only flowing if the heater is on and burning off the gas.

There is a device, called a Thermopile or Millivolt Generator, that looks like a cylinder about 1/4 in diameter, and probably about 2" long, though you may only see the top of it. It is located in the heater such that it is in direct contact with the flame of the Pilot light. When the gas is flowing, and the pilot light is on, metals in the Thermopile actually generate electricity from the heat. The gas valve in the heater stays open as long as there is electricity coming from the Thermopile. Make sense? So, in order for gas to flow into the heater while the valve is set to ON, that whole feedback system has to be operational.

Now, there wouldn\'t be heat when you first start a cold heater. So, when you light the pilot light, you turn the valve to PILOT. Notice that you have to push it in to get gas to flow, and you have to keep pushing it for 15-30 seconds or it\'ll go off. That\'s because in PILOT mode, you are manually overriding the gas valve and forcing it open, and if you let up before the thermopile has time to heat up, the gas will go out.

A pilot light, once lit, can go out for several reasons. These direct vent wall heaters are especially vulnerable to drafts of air from outside affecting burning conditions in the heater. They can literally "suck" the flame out. What happens is that the heater will be burning fine, but then when the thermostat sends the signal to turn off the heater (room is warm enough), the suction caused when the main gas burner goes out sucks out the pilot flame also. Without the pilot flame heating the Thermopile to keep the valve open, the heater won\'t start next time the room gets cold.

That\'s one reason. Another is that the pilot flame itself can be too weak because gunk can build up in the hole. It\'s a really tiny hole, so the tool to open it won\'t be found at your local hardware store. But your propane company should have a few. It\'s a tiny, tiny drill bit and you work it around in the hole of the pilot jet. Google pictures of the heater if you don\'t know where some of these parts fit on it. You may have to use a wrench and remove the pilot jet in order to clean it.

Now, remember you\'re dealing with gas, so you only want to be taking parts out if you know how to put them back in! You can do diagnostics on the electrical part of this system without taking any parts off. Find a friend who has a multimeter, and remove the leads on the thermopile. It should be making a certain amount of electricity when it\'s in the heat stream. You can contact Empire to get the voltages.

*You may have a faulty thermopile; check with meter. this would also apply if it seems the thermostat is acting funny (Thermopile provides current for thermostats in these systems)

*You may have a clogged pilot orifice; call propane company

*you may have to continually light your pilot light if there are windy

Hope this helps! Remember again, be safe around gas! If you don\'t feel confident putting it back together safely, don\'t take it apart!!!

Posted on Nov 25, 2012

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1 Answer

My mr heater mh9b won't stay lit. The pilot flame starts acting wierd and making noise after ten to fifteen minutes of being lit and then goes out completely. It can be re-lit but goes out again in a...

my mr heater mh9b won't stay lit. The pilot flame starts acting wierd and making noise after ten to fifteen minutes of being lit and then goes out completely. It can be re-lit but goes out again in a bit. Any suggestions?

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1 Answer

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