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Thread: Hayward H350 heater panel not lighting

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    Hayward H350 heater panel not lighting

    Hello,
    I received a Hayward H350 heater (used) and had my pool guy hook it up. The problem is that the control panel does not light up and we cannot turn on the heater. He tells me he tested and there is power going to the inside of the heater (I don't know exactly where he checked). Of note this heater had been hooked up to a 240V source and I have 120V; he switched this at the beginning of the hook up.
    I realize there are a lot of variables at play here, but if anybody has any ideas as to where to look I'd appreciate it. If this can be solved without replacing the control unit that would certainly help.
    Thanks,
    Ben

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    Re: Hayward H350 heater panel not lighting

    Hooking it up to a 120 volt source is different than a 240 source. These are set at the factory for 240 volt operation. There is a jumper on the board that has to be changed for 120 volt service. Page 28 on this manual explains this. https://www.hayward-pool.com/pdf/man...stallation.pdf
    Unknown make 18' above ground (bought used in 1999) Sparco sand filter. Hayward 100,000 BTu heater. 2 speed pump

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    Re: Hayward H350 heater panel not lighting

    If this is an older H350 then it's just a matter if using the correct wires at the transformer. If this is a newer FD, then you have a plug that one end is 120 and the other is 240. Use the 120 plug for your hook up.
    Paul
    http://www.gastekservices.com A word of caution: When working with gas and electrical you might want to consider a licensed contractor. Consider the value of your life and others around you. If you would like to provide a review of the help I provided, please use the following link to leave a review. gastek - Google Search,

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    Re: Hayward H350 heater panel not lighting

    Ok. So when I got home today I opened the panel and I think the voltage is the issue but just want to check. Is there a way I can post a picture here or can someone direct me to a good photo online (not the wiring diagram but an actual photo)?
    Thanks

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    Re: Hayward H350 heater panel not lighting

    The mobile site wasn't giving me an option to upload photos. This is the current wiring.Thanks for the advice.2014-06-24 20.18.43.jpg

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    Re: Hayward H350 heater panel not lighting

    That is the transformer and it only steps down the voltage to 24v. You need to look under the metal cover to the right of the transformer. That is where the wiring from the breaker terminates. Inside there you will see the connection for either 120 or 240.
    Paul
    http://www.gastekservices.com A word of caution: When working with gas and electrical you might want to consider a licensed contractor. Consider the value of your life and others around you. If you would like to provide a review of the help I provided, please use the following link to leave a review. gastek - Google Search,

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    Re: Hayward H350 heater panel not lighting

    OK.Thanks. I'll check tomorrow and post a new pic.

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    Re: Hayward H350 heater panel not lighting

    I checked it out and the wiring is correct. What would my next step be?

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    Re: Hayward H350 heater panel not lighting

    Sorry for the delay. It looked to be like the control board had a burned out resistor, so I replaced the board. Still didn't work so I replaced the transformer as well, as it looked like it was also burned out. Now the standby light finally comes on, but I can't get it out of standby. LCD display is blank, and I tried all buttons (mode, up, down) for various lengths of time and combinations with no luck.

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    Re: Hayward H350 heater panel not lighting

    So you replaced just the board or was it the entire keypad and board? If just the board, bad keypad probably. No real way to troubleshoot that other than replace it and see what happens.
    Paul
    http://www.gastekservices.com A word of caution: When working with gas and electrical you might want to consider a licensed contractor. Consider the value of your life and others around you. If you would like to provide a review of the help I provided, please use the following link to leave a review. gastek - Google Search,

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    Re: Hayward H350 heater panel not lighting

    It was the entire assembly (bezel, keypad, board).

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    Re: Hayward H350 heater panel not lighting

    Look on the board and you will see a set of two white dip switches. What are the positions of those switches? If they don't match up to the old part you took off, then you need to set them in the same position as the old one was. Now if they are in the same position then we are back to square one. Was this part you purchased brand new or a used one from ebay or some place.?
    Paul
    http://www.gastekservices.com A word of caution: When working with gas and electrical you might want to consider a licensed contractor. Consider the value of your life and others around you. If you would like to provide a review of the help I provided, please use the following link to leave a review. gastek - Google Search,

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    Re: Hayward H350 heater panel not lighting

    Dip switches are same as original. I also tried the other way just to check but no go. Parts purchased new. I suppose it's possible I got a bad board or keypad, but not my guess as they were brand new. I appreciate all the help.
    Is it possible that this is still a voltage issue? The replacement transformer had a sticker on the outside saying 240V, although the word on the inside were labeled like the original (120/240) and were wired correctly.

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    Re: Hayward H350 heater panel not lighting

    It doesn't sound like a transformer issue. Just for the heck of it remove the back cover on the new board enclosure and make sure the ribbon cable from the keypad is connected.
    Paul
    http://www.gastekservices.com A word of caution: When working with gas and electrical you might want to consider a licensed contractor. Consider the value of your life and others around you. If you would like to provide a review of the help I provided, please use the following link to leave a review. gastek - Google Search,

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    Re: Hayward H350 heater panel not lighting

    Ok. Will try when I get home in the morning. That cable doesn't affect the standby light?

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    Re: Hayward H350 heater panel not lighting

    OK so I have the issue correct, the stand by light is on but when you press the mode button, it never changes to either spa or pool?
    Paul
    http://www.gastekservices.com A word of caution: When working with gas and electrical you might want to consider a licensed contractor. Consider the value of your life and others around you. If you would like to provide a review of the help I provided, please use the following link to leave a review. gastek - Google Search,

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    Re: Hayward H350 heater panel not lighting

    You got it. I'll also try hooking up the old touch panel although I have no idea if it's good, so if it still doesn't work it doesn't help the diagnosis, but if it does work it will.

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    Re: Hayward H350 heater panel not lighting

    So I opened it up and guess what? The cable from the keypad was misaligned and only connected to 3 of the 4 pins. Once I fixed that the keypad and display work, now I just have to check the error code (alternating lo and sf). Does that combo mean a faulty temp sensor, or must I do further tests to confirm?

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    Re: Hayward H350 heater panel not lighting

    LO is either not enough water flow or the pressure switch is bad. f5 is probably SF, sensor failure. This would be the temperature sensor located on the header where the water inlet/outlet is.
    Paul
    http://www.gastekservices.com A word of caution: When working with gas and electrical you might want to consider a licensed contractor. Consider the value of your life and others around you. If you would like to provide a review of the help I provided, please use the following link to leave a review. gastek - Google Search,

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    Re: Hayward H350 heater panel not lighting

    Sorry for the typo, I did mean SF. I looked up the troubleshooting chart in the manual and I have a couple of questions.
    1. Is the temperature sensor the same thing as the thermistor? Or maybe the flow control thermostat? The parts list and diagram does not list temperature sensor.
    2. Under LO code there are four possible faults listed - water pressure switch, automatic temperature limiter switch, manual temperature limiter switch, and limit switch. Is the water pressure switch the same as the pressure switch assembly? Pressure switch adapter?
    3. What is the limit switch? The only similarly named parts listed are the temperature limiters kit, hi-limit 135 degree F, and Immersion hi-limit Rear Header 160 Degrees HM
    Thanks again

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