Question about Hayward H Series Millivolt 250,000 Btu Pool Heater H2501

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Hayward H2501, pilot is lit, but burners will not turn on. Pressure in filter is at 15 PSI. Checked the connections and they are ok

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Posted on Jan 02, 2017

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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

Posted on May 09, 2009

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  • 139 Answers

SOURCE: hayward heater not staying lit

possibly poor pilot adjustment or insuficient mv output from thermopile

Posted on Jun 19, 2009

  • 139 Answers

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

Posted on Jun 21, 2009

  • 12 Answers

SOURCE: hayward h250ed1 heater wont stay lit

Try cleaning your filter if dirty there will not be enough flow to llet heater fire. If filters clean you can try jumping the pressure switch.

Posted on Jun 25, 2009

  • 9 Answers

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

Posted on Jun 28, 2009

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1 Answer

My Hayward h250 Millivolt heater won't stay on. If I jump the "TH" connections I can get the main burners to come on, once I remove the jumper, the main flame goes out. I replaced the pilot assembly and...


you prolly have an electrical short somewhere. follow the circuit and if any safety is getting around 200-250 dc millivolts then theres the problem. otherwise you have an open safety switch, or tsta controls

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Having multiple issues with a milli-volt heater very common and can be expensive to fix at times. Start by cleaning EVERY connection in the safety circuit and the pilot circuit. If you have a milli-volt meter that would help a lot.

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Check the burner tube closest to the pilot side of the burner tray. Is it burning a nice blue like all the rest? If it is not, clean out the jet on the manifold in front of the tube.

If it is ok, can you get a millivolt reading off the generator (thermocouple)? If so, get the reading with just the pilot on it, then with the burner load. Finally, watch that reading as the burners run for a while to be sure it climbs.

The only other thing I can think of would be to get manometer readings to verify gas pressures before and after the valve.

Jul 30, 2009 | Hayward H Series Millivolt 250,000 Btu...

1 Answer

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

Jun 27, 2009 | Hayward H Series Millivolt 250,000 Btu...

1 Answer

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Sounds like the pilot assy needs to be replaced. It has 2 functions one is to light the main burner but also to let the system know that the burner is lit. If it thinks the burners are not lit it turns the gas off

Jun 23, 2009 | Hayward H Series Millivolt 250,000 Btu...

1 Answer

Hayward heater not staying lit


possibly poor pilot adjustment or insuficient mv output from thermopile

Jun 19, 2009 | Hayward H Series Millivolt 250,000 Btu...

1 Answer

Pool heater will not flame


sounds like a flame rectification probelm...look in the manual for solutions

May 30, 2009 | Hayward H Series Millivolt 250,000 Btu...

1 Answer

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

May 08, 2009 | Hayward H Series Millivolt 250,000 Btu...

1 Answer

Heater won't stay lit


On your main gas manifold you have orfaces that screw into it at each burner. Remove these and see if their are small spider webs in them. They will look like little lint balls. They can keep your main burner from getting gas and in turn keep the heater from sensing flame. The pilot lights and the heater starts but no flame at the main will shut it rite down. See if this helps.

May 05, 2009 | Hayward H Series Millivolt 250,000 Btu...

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