Try cleaning the tip of the wire that is near the flame nozzle...that is the heat sensor (thermocouple) which waits to get hot before it allows the gas to flow to the nozzle (safety measures) without the need for anyone to hold in the knob.If the wire is dirty or two short the gas will just stop once you release the knob.
SOURCE: I have a weil-mclain CGA-4-SPDN
You need to replace the Thermocouple. (pilot safety device) It would be best to call a Technician about this.
SOURCE: bosch aquastar 125b ng
Replace the thermocouple.
Thats the flame sensor.
If the gas valve is not sensing flame it will not stay lit.
T-couple's are about 9 bucks.
SOURCE: heater lites then goes to low flame will not stay on high flame
Pilot sensor or thermocoupler
SOURCE: flame goes out
the most common problem is the flame sensor located just behind the fire chamber, about two inches long in a round rubber boot with two wires. you can get one from mr. heater for about 3 bucks. the wires are a different color but all you have to do is splice them to your old wires. it doesn't matter how you connect them.
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