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

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Hayward pool heater c4205 has error message of LO

Service light is on and lo message. Pool filters are brand new

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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

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2 Answers

LO error


error codes don't appear on millivolt units. LO for digital models is an open safety within circuit, most common being the pressure switch

Apr 08, 2014 | Hayward H Series Pool & Spa Heater 400k...

1 Answer

Hayward propane pool heater service light on Lo 60 message


"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.
  • Etc
Also, on a propane heater, some makes & models will have the gas valve 'Lock Out'. This will be done by the ignition control module. To reset, heater will need to be powered off, then back on. Good Luck - hope this helped.

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Hayward h200 pool heater (LO) Error code


check gas pressure sounds like gas meter is too small

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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

1 Answer

The pool heater is not geting any gas to it We have the gas on Its not lighting It shows the letters LO on the sceen The service light is on


LO indicates insufficient water pressure. either your pressure switch is out of adjustment,faulty or your filter system needs cleaning(or backwashing).

Jul 10, 2009 | Hayward H Series

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"LO" error code on new H400FDN heater


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

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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

2 Answers

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.

May 24, 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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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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