Question about Hayward 250 1 Millivolt Propane Pool Heater 250000 BTU

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Can't get pool heater to work

The LO keeps flashing.

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  • Hayward Master
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Low pressure check filters or pressure switch

Posted on Mar 19, 2016

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Posted on Jan 02, 2017

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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

  • 16 Answers

SOURCE: Main pool pump failed and

LO code is for a fault at 1 or more of 4 switches. water temp, pressure limiter, ect. It is recommended that you contact a pool professional to deal with something like this. If you are in the Phoenix Metro area you can contact me at info@wefixuglypools.com

Posted on Dec 29, 2010

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1 Answer

Hayward h300 pool heater won't start


"LO" is simply informing you that the Heater is not sensing proper water flow through it! A Flow Problem.
A special sensor, called a pressure switch is this source. But... That does not mean it is bad - No, it is in most cases just doing its job!
Most common reason - Dirty Filter.
A good cleaning of the cartridges, or maybe a breakdown and recharge of a DE Filter, or a good cleansing backwash of your sand filter, will remedy this situation.
Or... Check for any OTHER reason or situations water flow may be reduced through the heater:
  • enough water in pool or spa?
  • If you have a weir gate in skimmer, is it stuck in the UP position?
  • Are any valves closed?
  • Do you have a bypass valve at the heater?
    • If open, this will reduce the amount of water going thru heater, close it to the point, LO goes away.
  • Could be debris in front of Pressure Switch, in the copper tubing
    • Unscrew and remove pressure switch, turn pump on. But first, align end of tube so that when water squirts out it will shoot out from heater and not onto electronic heater components!
  • If all above is good, you may have failed pressure switch?
  • Etc
Good Luck - hope this helped.

Sep 17, 2012 | Hayward H-series Electronic Gas Pool...

1 Answer

Raypak 2100 just get SPK then LO codes. won't ignite


if wired 120 volt check wiring and check gas pressure see if lines have cobwebs

Jan 02, 2012 | Raypak Rp2100 Pool & Spa Heater Lonox 407k...

1 Answer

What does error code r =8 at startup mean? Turned heater on for first time this year. Opened gas valve at tank and shut-off at heater. Pump is running. Turned 220 v breaker on in box and "spa on"...


Mike, I have found what I believe is the correct manual for your heater at http://www.pool-heaters.com/pdf/Pentair-Maxetherm_manual.pdf. I couldn't find an error code list in the manual but I might have missed it. If you call the the StaRite technical support line at 888-782-7483 they should be able to help youfigure this issue out. I hope this helps.

Please vote on this answer. Thank you.

Aug 26, 2011 | Sta Rite Sr200lp Max E Therm Pool & Spa...

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...

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 H series gas heater 2500i


There is a thermistor temperature sensor beside the inlet union on the heater that goes bad, it looks line a stainless steel nut with wires on it. You can unthread to replace it and it plugs into the board behind the display. The LO means low pressure probably caused by pressure switch adjustment.

Jul 07, 2009 | Hayward Pool Products Hayward 200k Ng H...

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...

3 Answers

Hayward H400 heater problem


LO usually indicates low water pressure. Check the pressure in your filter. You may need to backwash. If the filter is to clogged then the water pressure in the heater is so low that it won't activate the pressure switch. While checking the pressure turn the pump off and then on to make sure the pressure gauge is actually working. Also check the pressure coming out of the inlets into the pool. You should be able to tell if you have sufficient water pressure.

Jan 24, 2009 | Hayward H Series Pool & Spa Heater 400k...

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