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

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Pool heater will not ignite

My Hayward H400 pool heater has an error of A0 that indicate a problem with the blower switch... is there a simple fix such as resetting the system to extinguish the error code?

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My heater worked ok , btu made a clicking sound, now it shows a AO error? What can I do I dont have enough money to call a pool man again.

Posted on Sep 16, 2009

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Posted on Jan 02, 2017

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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...

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Hayward h400 pool heater blower not starting


it could be a bad blower vac switch, and you may look at the rubber tubing going into the switch to ensure it hasnt dry rotted.

Apr 07, 2014 | Hayward H Series Pool & Spa Heater 400k...

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Error code


make sure water filter is CLEAN ! this will throw a code

Jun 22, 2013 | Hayward H-series Electronic Gas Pool...

1 Answer

Error code A0


Just left of center inside the top of the front cabnit.(where the hayward label is) It's about 2 1/2" around and has two small hoses coming from it.

Jul 14, 2010 | Hayward H Series Pool & Spa Heater 400k...

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

AO error


This error is produced when the blower prover switch does not close after the blower starts, the control will stop the ignition and go into lockout. Automatic reset is immediate after the blower prover switch closes.

If you keep having this problem, contact a reputable service company, especially if it's under warranty.

The link to the owners manual is below, it references fault codes, etc..

Hope this helps.

http://74.125.95.132/search?q=cache:4mAdY7bLfoQJ:www.haywardnet.com/products/Manuals/pdfs/Manual227.pdf+hayward+AO+error&cd=7&hl=en&ct=clnk&gl=us

Sep 16, 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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