Hayward HP error

sounds like it doesn't have any water in the boiler

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

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Hayward error codes shows AC is blower vacuum switch closed
http://waterheatertimer.org/pdf/Hayward-error-codes.pdf

Hayward pool manuals:
http://www.hayward-pool.com/prd/In-Ground-Pool-Manuals_10201_10551_14502_-1___I.htm

If you need further help, I’m available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7

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

If you need further help, I’m available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7

Thank you for posting your question here on Fixya.com.

A 'LO' error code for a Hayward heater is a limit string open error. If the limit string opens the heater shuts down and goes into lockout. Automatic restart is 2 minutes after the error condition is corrected and the limit string closes.

The limit string is a series of switches designed to turn off the heater if air or water temperatures exceed a safe operating limit.

The problem may be faulty a switch(es) but is far more likely to be a system condition the switches are reacting too that needs to be corrected. Low flow of combustion air due to obstructions around the heater or the vent; low flow of water through the heater allowing too high a water temp; Poor venting or sooted-over heat exchanger causing flame rollout; inlet and outlet hose connections reversed; these are all conditions that should be eliminated if they exist.

If you are not familiar with these switches or the conditions described you may want to consider calling in a professional. Hayward can refer you to someone in your area who is. Call Hayward at 908-351-5400 or try the website locator found here. It is likely to still be covered under warranty.

If this answer does not fix your problem, please comment with additional details prior to rating the answer. You may also contact me thru our website at www.arrowpools.net. Positive feedback is appreciated once your problem is solved!

John

Have you installed anything in your home that uses gas? Alot of times it due to low gas pressure.

When you checked the orfices did you actually remove them? or just stick a paperclip inside and clean them?

If the heater is firing ..even for 2-3 seconds the ignightor is fine. If it wasnt it wouldnt lite, period... bad call on hayward

CE= Communication Error between Control Module
and Display Interface Assembly
1. Disconnect and then reconnect power to heater.
2. Check for faulty wiring or connection.
Inspect Display Interface Wiring. Ensure Display Interface Plug is securely attached to Control Module. .
3. Control Module and/or Display Interface Assembly
are defective.Replace Control Module and/or Display Interface Assembly.
Here is a linkt oH aywardmanuals:
http://www.haywardnet.com/inground/products/manuals.cfm

it sounds like a flame sensor.its located in lower end of burner box,remove it and clean with fine steel wool or emory cloth.