Question about Hayward 250kbtu Ng Pool Heater - Inground

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Hayward H250 in ground gas pool heater - "LO" limit string open

Can you tell me where to find the limit string and how to fix it? Thank you:)

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6ya6ya
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Posted on Jan 02, 2017

adamh294
  • 310 Answers

SOURCE: How do you install an igniter on the Hayward H250

Please refer to page 30 of this owners manual under the section labeled Ignitor assembley removal.
This should help to guide you through the removal and installation process.


Refer to page 43 if you needs part numbers for ordering, or just need help identifying parts.

Posted on Nov 23, 2010

thepool
  • 78 Answers

SOURCE: Hayward H250K gas pool heater error code

Low Flow errors are not necessarily real. They can be caused by improper adjustment or a defect of the pressure switch. Locate the pressure switch. Verify that the "switch" makes contact. Adjust the dial, reducing the distance the switch has to travel to engage. This will effectively lower the operating pressure required to operate. Keep adjusting until the unit stays on.

Posted on Apr 23, 2010

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2 Answers

What does lo mean on my h250 hayward pool heater


LO standss for limit open. the most common cause is lack of adequate water flow through heater. other causes are high temp limits.

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Hayward H250 has LO listed on the electronic panel after it had been blowing black soot out of it


check gas pressure heater overheated probably needs hi limits or fusible link plus clean heat exchange to solve

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Pf hayward error code on gas heater H250 IDPL1


check pressure switch if voltage both sides ok if not bad switch or clogged copper tube also check filters

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Our hayward heater H250 model was installed last year.. this year it started up after the winter no problem. We put it on Standby mode while the poolliner was being replaced and not it will not come on.....


Thank you for posting your question here on Fixya.com.


A 'LO' error code for a Hayward heater is a limit string open error. If the limit string opens the heater shuts down and goes into lockout. Automatic restart is 2 minutes after the error condition is corrected and the limit string closes.


The limit string is a series of switches designed to turn off the heater if air or water temperatures exceed a safe operating limit.


The problem may be faulty a switch(es) but is far more likely to be a system condition the switches are reacting too that needs to be corrected. Low flow of combustion air due to obstructions around the heater or the vent; low flow of water through the heater allowing too high a water temp; Poor venting or sooted-over heat exchanger causing flame rollout; inlet and outlet hose connections reversed; these are all conditions that should be eliminated if they exist.


If you are not familiar with these switches or the conditions described you may want to consider calling in a professional. Hayward can refer you to someone in your area who is. Call Hayward at 908-351-5400 or try the website locator found here. It is likely to still be covered under warranty.


If this answer does not fix your problem, please comment with additional details prior to rating the answer. You may also contact me thru our website at www.arrowpools.net. Positive feedback is appreciated once your problem is solved!


John

Jun 08, 2011 | Hayward 250kbtu Ng Pool Heater - Inground

2 Answers

Gives a "LO" and will


Thank you for posting your question here on Fixya.com.


A 'LO' error code for a Hayward heater is a limit string open error. If the limit string opens the heater shuts down and goes into lockout. Automatic restart is 2 minutes after the error condition is corrected and the limit string closes.


The limit string is a series of switches designed to turn off the heater if air or water temperatures exceed a safe operating limit.


The problem may be faulty a switch(es) but is far more likely to be a system condition the switches are reacting too that needs to be corrected. Low flow of combustion air due to obstructions around the heater or the vent; low flow of water through the heater allowing too high a water temp; Poor venting or sooted-over heat exchanger causing flame rollout. These are all conditions that should be eliminated if they exist.


If you are not familiar with these switches or the conditions described you may want to consider calling in a professional. Hayward can refer you to someone in your area who is. Call Hayward at 908-351-5400 or try the website locator found here.


If this answer does not fix your problem, please comment with additional details prior to rating the answer. You may also contact me thru our website at www.arrowpools.net. Positive feedback is appreciated once your problem is solved!


John

Jun 02, 2011 | Hayward 400fdn Low Nox Nat Gas Swimming...

1 Answer

Lo error showing and it kicks off about every 6 minutes


Thank you for posting your question here on Fixya.com.


A 'LO' error code for a Hayward heater is a limit string open error. If the limit string opens the heater shuts down and goes into lockout. Automatic restart is 2 minutes after the error condition is corrected and the limit string closes.


The limit string is a series of switches designed to turn off the heater if air or water temperatures exceed a safe operating limit.


The problem may be faulty a switch(es) but is far more likely to be a system condition the switches are reacting too that needs to be corrected. Low flow of combustion air due to obstructions around the heater or the vent; low flow of water through the heater allowing too high a water temp; Poor venting or sooted-over heat exchanger causing flame rollout. These are all conditions that should be eliminated if they exist.


If you are not familiar with these switches or the conditions described you may want to consider calling in a professional. Hayward can refer you to someone in your area who is. Call Hayward at 908-351-5400 or try the website locator found here.


If this answer does not fix your problem, please comment with additional details prior to rating the answer. You may also contact me thru our website at www.arrowpools.net. Positive feedback is appreciated once your problem is solved!


John

Mar 23, 2011 | Hayward H Series Pool & Spa Heater 400k...

1 Answer

Flashing LO


"LO" means a "Limit string open error" has occurred. See the owners manual for the many causes and possible solutions. Owners manual found here. http://www.haywardnet.com/products/Manuals/pdfs/Manual225.pdf

Apr 08, 2010 | Hayward 350K BTU H SERIES HEATER DRAFT...

1 Answer

Hayward H250K gas pool heater error code


Low Flow errors are not necessarily real. They can be caused by improper adjustment or a defect of the pressure switch. Locate the pressure switch. Verify that the "switch" makes contact. Adjust the dial, reducing the distance the switch has to travel to engage. This will effectively lower the operating pressure required to operate. Keep adjusting until the unit stays on.

May 27, 2009 | Hayward 250kbtu Ng Pool Heater - Inground

1 Answer

Hayward H250 giving me a "LO" error code and does not turn on.


9 times out of ten this means that you have a faulty water pressure switch. It could also be a limit switch, or air pressure switch. Make sure the filter is cleaned, and all valves are in the correct position. Once you are CERTAIN that water is flowing through the heater, you will need to short each individual component to find the faulty one.

Apr 10, 2009 | Hayward 250kbtu Ng Pool Heater - Inground

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