Question about Hayward H-series Electronic Gas Pool Heater H400

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Hayward h series Bo problem

With pimps on heater in Bo mode but will not fire. Gas on.

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  • Hayward Master
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BO = "By-Passed Operation"
This will show, when ever the heater is programmed, or wired, into an automation system. It means that the automation system has control of the heater, this was done by either programming, flipping a dip switch, or via a logic jumper. All depending on model of heater.

Posted on May 25, 2015

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  • Hayward Master
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Make sure you have adequate gas pressure

Posted on May 26, 2014

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Posted on Jan 02, 2017

jgwhomeequip
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SOURCE: the pilot won't light, don't hear gas going through the valve

Yes when you do not hear any gas it is a thermocouple problem and it needs to be replaced.

Posted on May 22, 2009

  • 4 Answers

SOURCE: hayward pool heater h series

the issue is a broken baffle in the system. there is a baffel that directs water into the heat exchanger and back out into the system. The welds that hold the baffel in place have broken off. It can be repaired if you take the unit to someone with a mig welder and have them re-weld it (muffler shop, mechanic?). there needs to be a weld on both sides. You can see the baffel if you remove the unit and look down the inlet and outlet tubes.

Posted on May 25, 2009

  • 1 Answer

SOURCE: Hayward H300 Spa Heater will not fire up

try to replace the thermo sensor it is located on the left side of tghe unit and has 3 wires running to it.

Posted on Jun 13, 2009

  • 128 Answers

SOURCE: same problem pool heater shows hayward pool heater bo error

BO means that you have bypassed operations. ie automation. if no automation is present then press and hold the Down arrow and Mode button for 3 seconds.

Posted on Aug 23, 2009

  • 64 Answers

SOURCE: H Series Pool & Spa Heater 400k Btu Propane Gas Milivolt Ignition H400p1: how do i fix the AO code on my hayward heater?...

AO will apply to your blower, blower tubing, or blower vacuum switch. You need to check these items.

Posted on May 20, 2010

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1 Answer

Had a power outage yesterday now heater won't ignite. No error codes.


bo = 'Bypassed Operation'
heater is now controlled via your automation system.
Create a heat call, turn solar off if active.
Heaters should be set to auto on.

Mar 07, 2015 | Hayward Pool Products Hayward Universal...

1 Answer

BO code heayer keeps cycling on and off


check to see if proper gas pressure call gas company give them added total thems all your appliances use they probably will give you a bigger meter then everything will run efficiently

May 24, 2014 | Hayward H-series Electronic Gas Pool...

1 Answer

Have a bo code heater keeps cycling on and off


BO code is bypass operation. It means that it is set to operate with an external controller. Things like Aqualink, Aqualogic, Intellitouch, EZ-Touch are all types of automation / external controllers. They have their own temperature sensor and allow remote control operation. To truly find the nature of your issue. I'd start by taking it out of bypass operation and see if the unit fires by itself ( without automation hooked up to it ). The fault may lie with the automation system. You never know.

May 24, 2014 | Hayward H-series Electronic Gas Pool...

1 Answer

Hayward H400 error code bo


This error means "Bypass Operation". On the back of the control module there are some "dip switches". They have an on or off position. Check switch number 2. Make sure it is in the "off" position. The "on" position is for a remote thermostat.

Jun 27, 2010 | Hayward H Series Pool & Spa Heater 400k...

1 Answer

My Hayward H Heater turns on, fires up the gas,


bet you have a spider web or small debri in the gas lines, take a wire into each one, happened to me too

Jun 06, 2010 | Hayward H Series Induced Draft Abg 100,000...

1 Answer

My service light is on and I have a bO code. The heater will run some times, more time than not it will not run. Thanks Dave


The bO code is a normal code. It stands for bypass operation and just means that the heater is wired into an automatic controller such as a jandy or aqualogic. If there is a call for heat and the heater doesn't fire, you should be getting an error code. It may take several (3 or so) attempts at firing before you will get the code. HTH

May 15, 2010 | Hayward H400idl2 400,000 Btu Low Nox...

1 Answer

My pool and spa heater is not working diplays service codes bo and AO


MAKE SURE THE FILTER IS CLEAN THAN THE TEMPETURE SENSOR MAY BE BAD, CLEAN THE FILTER FIRST

Oct 10, 2009 | Hayward H Series Pool & Spa Heater 400k...

2 Answers

Same problem pool heater shows hayward pool heater bo error


BO means that you have bypassed operations. ie automation. if no automation is present then press and hold the Down arrow and Mode button for 3 seconds.

Aug 01, 2009 | Hayward H Series Pool & Spa Heater 400k...

2 Answers

Hayward H400 Pool heater will not stay lit


"IF" - Hayward Pool Heater Fails to Ignite: the most common reason for this problem is insufficient gas supply. The Hayward heater LED display will show a diagnostic fault code of "IF" which stands for Ignition Failure. Undetected gas pressure problems if not investigated properly may result in unnecessary replacement and servicing of your Hayward Pool Heater.

Jun 06, 2009 | Hayward H-series Electronic Gas Pool...

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