Most often, this is a faulty thermocouple. Replace it, but first be sure the pilot flame is actually heating the thermocouple. If it is not, it will not stay lit. Sometimes they fall down out of it's holding bracket or just go bad. A lazy yellow pilot flame means the pilot orifice is dirty and needs to be cleaned. If the pilot flame is a string blue color, then replace the thermocouple.
SOURCE: pilot light on the gas boiler won't stay lit it's
The pilot flame must touch (burn) the tip oqef the t-couple to hold the magnet in the gas value open.make sure the pilot orifice (hole) is clear.the pilot pressure (in the tube) is factory set full open & can only be adjusted down (less). Also check the gas **** didn't get closed or turned half way.? Assuming its not the t-couple. If all is good & it still won't stay on. Replace the gas value.!
SOURCE: gas fireplace pilot light won't stay light or
The first thing to change would be the Thermo-coupler
SOURCE: montgomery ward hot water heater model SRM 33004 PILOT light won't stay lite ?
The oriface may be partialy plugged or the thermo-couple is bad.
SOURCE: pilot light won't stay on
Dust gets inside the pilot safety during the months when it is not in use. Blow out the pilot safety without disturbing the flap. and retry.
ODS VENT FREE HEATER TUNEUP
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