I need to find a thermocouple for a mr heater Model mh35fa propane. mr heater does not have them in stock

First follow this trouble shooting guide to make sure you need one-http://www.mrheater.com/product/faqs/little-buddy-troubleshooting/ Then Amazon http://www.amazon.com/Mr-Heater-Pilot-Assembly-Portable/dp/B008DBRB8W Make sure it's the right one for your model heater.0810snp

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Blocked pilot too short or faulty thermocouple

The tank size dosn't matter all you need is a feed line This looks like a spicific tank appalaction but just feed it remotely with a normal propane tank and a feed line and save your self the head ache as long as it dose what you want it to do ist cool

Yes, I do. Master Distributors stocks parts for All Pro heaters. http://www.masterparts.net/

Make sure the copper tube coming to the pilot is NOT touching any metal,if it is that will cause the pilot not to stay light

the pilot light is busted simply replace a new one

The thermocouple is bad or not aligned properly. It is the metal bar in front of the pilot light. This bar senses the heat put off by the pilot light. If it does not get hot it will not allow the gas to flow. You either need to align it so that it is in front of the pilot light and receives enough heat to allow the gas valve to operate or possibly the thermocouple has gone bad and needs replacing.

No pilot in this unit.
Check the thermocouple and its connections.
The thermocouple is the device that has the copper cable connecting it to the vave unit. It leads up into where the burner can "heat it up". This indicates to the controll valve that the gas is actually burning and keeps the valve open.

There is a thermocouple that protrudes up into the flame. If the thermocouple is bad or out of adjustment it will not produce enough electric current to lock the red knob down allowing the heater go into operating mode. This thermocouple is a safety device that senses weather there is a flame or not. If no flame no heat don't turn on. If heat then there must be flame OK turn on. The thermocouple should protrude into the flame about an inch to heat it sufficiently to trigger the valve if it doesn't adjust it into the flame more. If adjusting does no good replace it. Take the old thermocouple to the store you bought the heater at and get a replacement. If you cant get it there almost all hardware stores or heating stores will have generic replacements that will also work.