Question about Hayward 250kbtu Ng Pool Heater - Inground

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HOW DO YOU CORRECT ''LO'' ERROR (LIMIT STRING PROBLEM) ON A HAYWARD HEATER H250FD??

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You need to find out what is bad in the string. The first thing to check is the pressure switch. Not so much the switch but clean the filter and baskets and check the impeller for a clog. These will let the pre sw shut the heater down. The second thing to check is the roll out switch. This is in the bottom of the cabinet on the fire wall just above the burners. It looks like a black sleeve on the wire that crosses the cabinet. It's a wax switch that melts and shuts the heater down if the fire rolls out the front of the heater. If this has gone bad you will need to find the reason it did and fix that or it will just do it again.
The other things on the string you just need to jump past and check, then replace the bad component. Good luck.

Posted on Sep 07, 2010

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1 Answer

Why does my hayward h250fd have and if error code? it is a brand new heater


If the control exceeds the maximum number of ignition retries or recycles the heater will shut down and go into lockout. Automatic reset is 60 minutes.
There are a few reasons that this might be happening. They range from air in the gas line to inadequate gas flow. Start by checking the installation

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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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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

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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

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1 Answer

Getting LO error


Lo is an error code dealing with the safety loop, hi limit switches, water pressure switches. Check for continuity and the wiring between the hi limit switches and the water pressure switch. Also, check to make sure the filter is clean and the pump basket is empty. These also can cause a low flow situation that will cause the pressure switch to not close properly.

May 23, 2010 | Hayward 250kbtu Ng Pool Heater - Inground

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

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My hayward heater gives a LO error when trying to heat. you cant put the heater either in pool or spa mode, then set the temp. The temp flashes then you get a LO error. I've checked the valve settings to...


One of your limits is not working or not wired up. An easy way to check the limits - Water pressure switch, Hi limits, air pressure switch all of which have 2 wires going to them. Unplug one item and connect the 2 wires together ( paper clip works fine ) Then retest, if problem does not go away remove paper clip and reconnect wires and move to the next limit. The limits are located in the black plastic header. Always make sure water is flowing through the heater at all times while checking the limits.

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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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