Question about Hayward H-series Electronic Gas Pool Heater H300

2 Answers

Error code (LO)

Heater will run about 20 minutes at a time before shuting off and giveing Error Code (LO).

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  • Hayward Master
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LO is simply informing you that the Heater is not sensing proper water flow through it! 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.

Posted on May 25, 2015

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  • 12 Answers

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

Posted on Jul 19, 2013

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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

  • 2 Answers

SOURCE: "LO" error code on new H400FDN heater

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

Posted on Jun 07, 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

  • 4 Answers

SOURCE: LO error message

On 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. Always make sure water is flowing through the heater at all times while checking the limits.

Posted on Mar 01, 2010

  • 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

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Check out the Link and the info below.
Question: Front Load Washer - Error Code - F8 E1 or LO FL Answer Product Symptom:
Front Load Washer - Error Code - F8 E1 or LO FL


F8 E1 or LO FL Code in display:
No water detected entering washer after 13 minutes, the pressure switch input has not been detected.
If the washer has an F8 E1 error or LO FL error, the door will be locked, and the control will be unresponsive. The washer will start a drain routine which takes approximately 8 to 10 minutes, during which time the pump will run continuously. The control will not accept any input during this time. Please wait 10 minutes before trying to perform any functions.
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Turn on the water. Check the household water supply to see if the hot and cold water faucets are turned on. Make sure to open both faucets completely for proper fill.

NOTE: Both Hot and Cold water must be supplied to the washer.

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