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

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Same problem pool heater shows hayward pool heater bo error

It shows bo the heater will not start up and there is no outside control source. how can i fix this

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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

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When I hold the mode and the down button at the same time, the bo error is still in display screen

Posted on May 30, 2015

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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

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...

2 Answers

Hayward h series Bo problem


make sure you have adequate gas pressure

May 17, 2014 | Hayward H-series Electronic Gas Pool...

1 Answer

IF error code when trying to start


Error IF is ignition failure.
Last page shows troubleshoot walk through ranging from low gas pressure to bad gas control valve to failed wiring etc
http://waterheatertimer.org/pdf/Hayward-error-codes.pdf

Oct 28, 2012 | Hayward H-series Electronic Gas Pool...

1 Answer

My hayward pool heater gives me a code sb what part is this


Possibly failed keypad, or stuck key on keypad.
This product should be under full warranty, and installer should be called.
Hayward 350 product manual: Error codes start page 38 do not show Sb
http://www.hayward-pool.com/pdf/manuals/Manual285.pdf
However Sb error code shows on following manual as 'Keypad failure' or 'stuck key'... one of the keys is stuck longer than 30 seconds, but control will still function, replace keypad.
http://waterheatertimer.org/pdf/Hayward-error-codes.pdf

Sep 20, 2012 | Hayward H350FDP Low NOx Propane Gas Pool...

1 Answer

Hayward Heater H series 400 BTU will not start


This is a normal display when heater is being controlled by a remote thermostat. No service is required. If heater is not being controlled by remote thermostat, change setting by using the MODE key to put the heater into STANDBY. Press and hold the DOWN key and then press and hold the MODE key. HOLD down both keys for 3 seconds until the indication "bo" is removed from the display.
The key to this is DOWN first and then together with MODE, both for 3 seconds.

Make sure the display is not showing "BD".

Jul 06, 2017 | Hayward H Series Pool & Spa Heater 400k...

1 Answer

"bo" when turns on then goes to service and shows


Bo means bypass operation which means the heater is being controlled by an outside control. There are 2 togs on the back of the board that control this function

Jun 19, 2011 | Hayward 250kbtu Ng Pool Heater - Inground

1 Answer

H400IDL Hayward Pool Heater. Ours is dead. Any suggestions on what we need to do to fix it? FS, BO are our error messages.


BO is bypass operation fault and FS is temp.sensor failure. It is recommended that you contact a pool professional to fix this. If you are in the Phoenix Metro area you can contact me at info@wefixuglypools.com

Dec 28, 2010 | Hayward 250kbtu Ng Pool Heater - Inground

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...

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