Question about Hayward H Series Pool & Spa Heater 400k Btu Propane Gas Milivolt Ignition H400p1

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Also getting the LO code. How do I access the switches to flip?

I'm not sure how to get to the pressure and temp switches to try to flip them one at a time, as suggested.

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Clean the filter

Posted on Sep 11, 2009

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1 Answer

How to check a bad pressure switch


make sure filters are clean make sure voltage on both sides of pressure switch if not check copper syphon loop to see if plugged

Oct 03, 2014 | Pool & Spa

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Getting a code of "LO" on my colman spa


lo pressure either dirty filters or recirculation pump isnt working or working properly or the pressure switch is bad or syphon loop to pressure switch is plugged

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Main pool pump failed and replaced. After replacement H400 heater shows LO code. Is there a reset capability on the heater?


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

Dec 25, 2010 | 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

Gettin LO error on display


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 H-series Electronic Gas Pool...

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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.

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

1 Answer

Error code lo and eo4


The LO is just telling you the water is below 58 degrees. The EO4 is the fan sensor. If you haven't used the heater for a while you should check for rat and bird nests then you can check your air pressure switch to be sure it is OK. The NT LN model will have the gas pressure switch in the same circut, so if you have the low nox model be sure to check all your gas valves and be sure they are on. If this is a LP heater be sure your tank is at least 1/3 full to have enough pressure to run the heater. If the heater hasen't been run for a while be sure to bleed your gas line also. Good luck.

Dec 04, 2009 | Pentair Minimax NT Heater

1 Answer

LO service message


LO is ignition lockout. The heater has tried to fire three times without success. It is usually the prressure switch but can also be the temp limit switch or the vent pressure switch. Locate and jump one at a time to find faulty switch.

Aug 15, 2009 | Hayward H Series Pool & Spa Heater 400k...

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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