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 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: have pilot light lit but unit willnot come on hayward h350 heater
check millivolt output,if it is in normal range(400-600)check for continuity on pressure switch,flame rollout and high limits.
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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