Question about Hayward H Series Electronic Ignition 250,000 Btu Pool Heater H250ped2

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LO is flashing on the screen and the heater is not firing

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Is your filter clean?

Posted on Oct 02, 2009

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Posted on Jan 02, 2017

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1 Answer

What does this code mean? :LO


check pressure switch or copper tube to it

May 22, 2014 | Raypak RP2100 DIGITAL POOL HEATER R265

2 Answers

LO on Display


"LO" means lock out. This means that the heater has failed to fire, and will not attempt to do so again until it is turned off and back on.

Either the heater is getting no gas, the gas valve is not opening for any of several reasons, the signal to spark is not being sent to the ignitor, the ignitor has failed, or the heater is failing to detect that the burner has been lit. Best to get a tech on it.

Jan 26, 2014 | Sta Rite Sr400na Max E Therm Pool & Spa...

1 Answer

Pool heater says lo


Say "lo back! Sorry about that. Can you give me a little more info about indications? Has the filter been cleaned lately? A dirty filter often will restrict the water flow enough to where the heater thinks that the pump is not running.
If there is doubt jump the pressure switch inside the heater and if it fires you have a dirty filter or a bad pressure switch.

Jul 04, 2013 | Raypak 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

Digital display shows LO what should i do


LO is a limit string open. This is what I refer to as a saftey circut. It will peobally be a dirty filter or a plugged up basket. The heater need enough water flow to run or it will overheat and cause damage to the heater. Without enough flow the saftey circut shuts the heater down before this can occur. If it is more than this it is probally time to get a repairman involved. Good luck and remember this is a box full of fire that runs on high voltage.

Mar 05, 2010 | Pentair Minimax NT Heater

1 Answer

Bat lo flashing periodically


You need to change batteries. The bat lo light flashes when you have about 10% battery life left. Rus

Dec 05, 2009 | Honeywell CT3200 5-2 Day Electronic...

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...

2 Answers

"LO" error code on new H400FDN heater


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

Jun 07, 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...

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