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Hold the pilot button down for a full minute after it lights, then release. If this does not work then the thermocouple is not adjusted where the flame is heating it or you just have a faulty new thermocouple.
Describe the pilot. Is it a strong blue flame or lazy yellow? Is the thermocouple getting red hot by the pilot flame? I'm wondering if the pilot is impinging enough on the thermocouple to keep it lit. It may be dirty, so try blowing out the pilot orifice with a can of compressed air and see if that helps. Also make sure the thermocouple tip is not burn't. If you feel the tip and it feels jagged, then replace it. Hope that helps. Douglas
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
sounds like your thermacouplar is going out and needs replaced. Sometimes these will act like they are working fine , but when the pilot stays on for awhile and later goes out it is a sure sign that it is bad