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Pool heater is stuck - Hayward Pool & Spa

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Just had our circuit board on H400FD Haywood pool heater replaced. Heater did fire up but wouldn't go past 65 degrees and went to standby.


It may be wired incorrectly, there are 3 terminals for the Hayward heater that connect it to automation.

1 spa
2 pool
3 comm

If they are not wired correctly this issue can happen.

Dec 31, 2016 | Pool & Spa

1 Answer

Starite sr400lp runs fine no errors, however water to pool is not hot, or barely warm


soulds like maual bypass is stuck letting too much water flow through heater and doesnt have enough time to heat it the spring is probably stuck

May 11, 2014 | Pool & Spa

1 Answer

My Teledyne Laars LLD spa heaters starts and heats for a couple of minutes thins shuts down. I have tried this several times with the same results. I hear the switch click and then the heater ignites and...


Since the heater fires it sounds like it could be the bypass valve stuck open. The bypass valve allows some of the water to enter the heater, while the rest bypasses the heater and returns to the pool.


If the bypass is stuck open, or broken, it allows the vast majority of the water to bypass the heater and continue to the pool. The water that is in the heat exchanger will become too hot due to slow flow and activate the high limit switch, turning the heater off.


The bypass is located where the pipes attach to the heater and can be checked or replaced if needed fairly easily.

Apr 16, 2013 | Pool & Spa

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

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

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

1 Answer

Heater for pool not responding


leave power off for about 15 minutes for a reset if still on check control panel heater relay may be stuck or faulty same goes for stat -if both are good most likely mother board is problem

Mar 05, 2010 | Sta Rite Sr400na Max E Therm Pool & Spa...

1 Answer

My thermostat for the pool is stuck at 199 degrees. Cannot use the spa because it thinks the temp is already high.


CHANGE THE TEMP SENSOR AT THE HEATER . YOU MAY RESET THE HEATER (TURN BREAKERS OFF FOR 20 SEC ) BUT THE CODE MAY COME BACK

Oct 23, 2009 | Jandy Laars LX Pool Heater / 400,000 BTU /...

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