How to Fix Hayward Heater LO Code: Step-by-Step Guide

The LO code can appear on the display screen of your Hayward pool heater. This code indicates that the safety circuit’s limit string, which shuts down the heater and activates lockout mode to prevent harm, is open. A low water flow rate or a broken switch in the temperature, vent, or water pressure can cause the limit string to open.

We will describe the causes of the Hayward heater LO code in this article, along with solutions. We will also offer some advice on how to keep this issue from recurring.

Quick Summary

  • The Hayward heater’s LO code denotes a problem with water flow, which may be brought on by things like clogged filters or broken switches.
  • Turn off the power, clean or replace the pool filter, check and replace any broken switches, such as the water pressure switch, temperature limit switch, vent pressure switch, or exhaust gas temperature switch, to fix the problem.
  • If the problem persists, restart the heater and get professional assistance.
  • Follow manufacturer guidelines, maintain routine filter cleaning, guarantee correct pump operation, minimise overheating the pool, and clear heater vents to prevent recurrence.
  • Turn off the power, find the temperature limit switch, check its continuity with a multimeter, and if it is bad, replace it with a new one using the correct procedures.

What Causes the Hayward Heater LO Code?

The Hayward heater’s LO code signifies that there is insufficient water flow for the heater to function safely. This may be brought on by a number of things, including:

  • A pool filter that is clogged or unclean and lowers the flow rate and pressure of the water.
  • A broken water pressure switch that turns off the heater because it cannot detect the water flow.
  • A defective temperature limit switch that activates and turns off the heater when the water temperature rises above a particular threshold.
  • A defective vent pressure switch that activates and turns off the heater when the vent pressure rises above a specified threshold.
  • A defective exhaust gas temperature limit switch that activates and turns off the heater when the exhaust gas temperature reaches a predetermined threshold.
  • To resolve the Hayward heater LO error, you must figure out which switch is at fault and, if required, replace it. Additionally, you should check the water flow to make sure it is greater than the minimum pressure needed for your heater model.

How to Fix the Hayward Heater LO Code

Take the following actions to resolve the Hayward heater LO code:

  • Wait for the heater to cool down before cutting off the electricity.
  • If the pool filter is dirty or blocked, check it out and clean it. To clean any dirt or debris from the filter elements, use a garden hose. Replace your filter with a new one if it is too worn out or damaged.
  • Make sure the water pressure switch is operational by checking it. Two wires are linked to the water pressure switch, which is situated close to the heater’s inlet pipe. To check the switch connections’ continuity, use a multimeter. When the pump is running, if there is no continuity, the switch is broken and needs to be replaced.
  • Make sure the temperature limit switch is operational by checking it. Two wires are linked to the temperature limit switch, which is positioned inside the heater cabinet. To check the switch connections’ continuity, use a multimeter. The switch needs to be replaced if there is no continuity when the water temperature is below 140°F.
  • Verify the vent pressure switch’s functionality by checking it. Two wires are attached to the vent pressure switch, which is situated close to the heater’s exhaust vent. To check the switch connections’ continuity, use a multimeter. The switch needs to be replaced if there is no continuity when the vent pressure is less than 1.5 inches of water column.
  • Make that the exhaust gas temperature limit switch is in good working order by inspecting it. Two wires are linked to the exhaust gas temperature limit switch, which is situated close to the heater’s heat exchanger. To check the switch connections’ continuity, use a multimeter. The switch needs to be replaced if there is no continuity when the exhaust gas temperature is less than 500°F.
  • Turn on the heater’s power supply, and then wait for it to resume on its own after two minutes. If the LO code continues, speak with a qualified service technician for more advice.

How to Prevent

The LO Code for Hayward Heaters

  • In order to avoid getting another Hayward heater LO code, you should:
  • Your pool filter should be cleaned on a regular basis and replaced as needed.
  • Make sure your pool pump is functioning properly and giving the heater enough water flow and pressure.
  • Avoid turning the thermostat up too high or overheating your pool.
  • Make sure your heater vent is free of any debris or obstacles that can affect the vent pressure or temperature of the exhaust gas.
  • For heater installation, use, and maintenance, abide with the manufacturer’s recommendations.

How to Test and Replace the Temperature Limit Switch

A safety feature known as the temperature limit switch keeps track of the water’s temperature and turns off the heater when it rises above a certain threshold. Two wires are linked to the temperature limit switch, which is positioned inside the heater cabinet.

The steps below should be followed to test and replace the temperature limit switch:

  • Wait for the heater to cool down before cutting off the electricity.
  • Inside the heater cabinet, look for the temperature limit switch. Normally, it is fixed to a bracket close to the heat exchanger.
  • The two wires should be disconnected from the switch terminals and marked for reconnection.
  • Check the switch contacts’ continuity using a multimeter. Touch the probes of the multimeter to the switch terminals when it is in the ohms or resistance mode. The switch needs to be replaced if there is no continuity when the water temperature is below 140°F.
  • Remove the mounting screws, then remove the old switch to replace it. The new switch should be put in the same location and fastened with screws.
  • In accordance with the labels, reattach the wires to the switch terminals.
  • Turn on the heater’s power supply, and then wait for it to resume on its own after two minutes. If the LO code continues, speak with a qualified service technician for more advice.

Conclusion

A typical error code for pool heaters, the Hayward heater LO code denotes a problem with limited water flow. It could be brought on by a clogged filter, a broken switch, or low pump pressure.

You must inspect these parts and replace them if necessary in order to fix it. Additionally, make sure that your water flow is greater than the minimum pressure needed for your heater model.

You ought to be able to resolve the Hayward heater LO code by using the procedures provided here and start enjoying your pool warmer once more. However, you should get assistance from a qualified service specialist if you lack confidence or experience in troubleshooting pool heaters.

FAQ,s

What does Lo mean on my Hayward heater? 

A difficulty with water flow is indicated by the Hayward heater’s “Lo” indication. It indicates that there is not enough water flowing, which could be due to a clogged filter, a closed valve, or a malfunctioning pump. To prevent any harm to the heater, it is crucial to treat this problem very away.

What is the IO code on Hayward?

 On a Hayward heater, the “IO” code denotes “Ignition Failure.” When the heater’s ignition process fails to light the burners, this error happens. Problems with the gas supply, the pilot assembly, or the ignition system may be to blame. To identify and solve the issue, expert assistance may be needed.

What is the LP code on a Hayward heater? 

The “LP” code on a Hayward heater denotes a Low-Pressure issue, to be precise. When the heater doesn’t receive enough gas pressure, this error happens. A closed gas valve, a depleted gas supply, or issues with the gas line could all be to blame. The heater must be dealt with properly for it to function securely and effectively.

What is the error code E01 on a Hayward pool heater?

A flame sensing problem is indicated by the error number “E01” on a Hayward pool heater. When the heater is being ignited, this error happens when the control system cannot identify the presence of a flame. A clogged flame sensor, a broken igniter, or problems with the gas supply could be to blame. To effectively fix this problem, expert troubleshooting and maintenance are advised.

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