Question about Hayward H-series Electronic Gas Pool Heater H300

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Hayward h200 pool heater (LO) Error code

Heater will run for about 20 minutes at a time before kicking off and give a (LO) error code.

Posted by Anonymous on

1 Answer

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  • Hayward Master
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Check gas pressure sounds like gas meter is too small

Posted on Mar 19, 2016

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Posted on Jan 02, 2017

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SOURCE: 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.

Posted on Apr 11, 2009

  • 5 Answers

SOURCE: Error code LO

Is the heater installed indoors?? if so you'll need a vent pressure orifice kit.
if not check your water press. (below 18 PSI on filter) Place filter on "recir" if it fires and stays on . it's the pressure.
check to see if all connections a set tight hi-ltd switch wire harness etc.

Posted on Jun 07, 2009

  • 139 Answers

SOURCE: hayward pool heater c4205 has error message of LO

lo usually indicates insufficient water flow and/or pressure switch malfunction.make sure filter is clean and pressure is in normal range

Posted on Jun 21, 2009

  • 4 Answers

SOURCE: my hayward heater gives a LO error when trying 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.

Posted on Mar 01, 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

Error code (LO)


Could be either the pressure switch(tells the heater that there is suitable amount of water flowing the startup the ignition), hi limit switches, or low vent pressure(if you have a exhaust fan installed for the model. Easiest thing to try is to give the pool filter a good backwash. If this doesnt solve the problem, than the above electrical components need to be looked at and singled out

Jul 12, 2013 | Hayward H-series Electronic Gas Pool...

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

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

2 Answers

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.

Feb 15, 2010 | Hayward H Series Pool & Spa Heater 400k...

1 Answer

Hayward pool heater c4205 has error message of LO


lo usually indicates insufficient water flow and/or pressure switch malfunction.make sure filter is clean and pressure is in normal range

Jun 20, 2009 | Hayward H Series Pool & Spa Heater 400k...

2 Answers

"LO" error code on new H400FDN heater


it is low water pressure sensed, unit will not start unless pump is working

Jun 07, 2009 | Hayward 250kbtu Ng Pool Heater - Inground

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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