Re: will turn off after 1 min run on low heat burn
You didn't mention the model number, but they are all pretty basic. The flame sensor and thermo pile which are thin flame sensors, get charred and need to be cleaned. They should be cleaned with a soft cloth or even a dollar bill will work (a worn one)
When the heater shuts down it usually means it is not sensing the flame and this will cause it to shut off automatically. I have included a link to get the owners manual below.
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When this type of problem happens, you most likely need to take apart your heater and clean it well. If it still doesn't work after that, blow it out with an air compressor. If then it still isn't working, I suggest you sell that heater and buy a new one.
Most T-Stats have a On / Auto on a forced air system. On means the fan will run all the time even if it is not calling for heat. Auto only runs when calling for heat. Does the fan turn off in the auto mode at all? To test it...BE SURE THE FAN IS IN THE AUTO MODE ON THE T-STAT... Turn the thermostat all the way down and keep it there for appox 15 mins. If it is wired properly and the fan limit is set properly the fan should turn off. If it doesn't it is not the thermostat were the problem lies.
Most forced air units have a fan / high limit switch. There is a setting on the switch for the fan to turn on and a setting for the fan to turn off or it has a setting and a differental switch for it to turn off/on. Example - the fan comes on when the temp in the heat exchanger reaches 110 degrees F and will shut down at 95 degrees F after the thermostat is satified...this would hav a differental of 15 degrees F. It may be set to low and the fan continues to run long after all of the heat has been removed from the heat exchanger. This in turn will cause cool air to be coming out of the registers.
Try to take pilot assembly apart and clean real good. This will work most of the time. If it does not work for you, you will need to replace the gas valve. It's expensive but I'm about positive that cleaning it will fix it. Gas burns dirty and after a couple seasons a scale builds up that causes this problem. It's pretty common and nothing to worry about after it's cleaned. Good luck.
these units do not have a low oxygen senser on then,they only have a tip over senser.they work very well in a tent for warming the air up in the tent.but tents do have a lot of air flow tto them.must of the heat goes up to the roof anyway.they are nice to turn on in the morning to knock the chill out of the air to get dressed.hope this helps,let me know