Looks like your pilot generator may have some corrosion on it. Follow the stainless steel tubing on the gas valve as it goes down to the burner area. At the end of this is the pilot assembly. If you can remove this so your able to work on it you will se a short metal rod that the pilot flame touches when lit. This generates current that keeps the gas flowing to the pilot to keep it lit. Take some sand paper and give it a light sand to remove any corrosion on it. Reassemble at put it together. You may also need to clean the pilot tube(stainless tube from valve). Small spiderwebs can reduce the flow to the pilot and cause this problem also
SOURCE: Hayward H250 (millivolt) pilot won't stay lit
make sure the flame hits the thermo couple if so then replace it lows has them in the water heater section thermo couple gets hot makes millivolt signal then opens gas valve
SOURCE: hayward heater not staying lit
possibly poor pilot adjustment or insuficient mv output from thermopile
SOURCE: Hayward Comfortzone pool heater pilot will stay
check for continuity at all control and safety components,i.e. press switch,high limits,thermostat,on/off switch and flame roll out switch
SOURCE: pilot will not stay lit after button release
most likely you have a thermopile that has low output. it takes about 100mv to maintain pilot light
SOURCE: Hayward 250 heater won't fire up
Check the control circuit, specifically the pressure switch, for continuity with an ohm meter....any reading over 2 ohms needs to be investigated
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