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Thread: Pool heater check ignition fault

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    Pool heater check ignition fault

    So I opened up our Jandy Legacy LRZ 399,000 to replace the insulation panels. While doing so I disconnected the unit to make examining the heat exchange easier. Once done trying to turn on the heat threw FAULT-CHECK IGN CONTROL. Now this happens now and then since I bought the unit. The company said it was my gas pressure. Well tonight the gas co measured 7 WC at the appliance. According to the spec 5.5 to 10 is the range. He mentioned it short cycled, which is what I've noticed in the past. It heat the element , maybe 5 10 seconds later you can hear the gas supply switch turn on . The sound of flames igniting occurs and instantly the gas supply switch turns off. While this happend once and a while in the past and would recover now it does not. The pump pressure is steady, the heater is installed in a well ventilated area... I'm at a loss. Any ideas , I'm running out of things to try and we close up soon, would be nice to have heat next summer.

    Thx !!!

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    Teald024's Avatar
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    Re: Pool heater check ignition fault

    Bad or dirty flame sensor
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    Re: Pool heater check ignition fault

    If the unit lights and then goers out and displays FAULT-CHECK IGN CONTROL, you probably have a bad flame sensor. You can try cleaning it with steel wool and see if that helps. If not, then you would bed to replace it.
    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: Pool heater check ignition fault

    You may want to check the burners as well while you are in the neighborhood. The flame sensor is mounted above one of the flame rails, somewhere in the middle of the tray. If the particular rail that is under the sensor is clogged/dirty and there is no gas traveling down the rail meaning that there would be no flame under the sensor to confirm flame.
    Factory Warranty Station for:
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    and Paramount pool cleaning systems.

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    Re: Pool heater check ignition fault

    I was thinking it was the sensor as well , but I found the following sequence in the technician workbook.. If the sensor wasn't rectified the valve should take 7 seconds to turn off no ? It's basically instant. Wondering if it's the ignition control or the Main board.

    1. 120 VAC to Igniter - Igniter heats to 2600 F. - 40 second heat-up.
    2. 24 V is sent on the Brown wire to Gas Valve ... Gas Valve Opens.
    3. AC Micro Amp signal sent to Flame Sensor
    4. Burners ignite, AC Micro Amp signal is rectified to a DC Micro Amp signal.
    5. DC Micro Amp signal returns to the Ignition Control on the Ground wire.
    6. 5 seconds after Gas Valve gets power or when rectification is confirmed power to
    Igniter goes off.
    – If rectification is not confirmed power to gas valve shuts off after 7 seconds.
    – 2 additional tries (3 total) then shut down/lock out.
    – Turn heater off, then back to pool or spa to reset.
    If the heater is not turned off it will automatically reset after one hour.

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    Re: Pool heater check ignition fault

    Are you timing from after step 2? or after step 4?
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    Re: Pool heater check ignition fault

    Basically both occurs within moments so technically step 4 I guess. The flame ignites almost instantly when gas opens. The moment flames come on it closes.

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    Re: Pool heater check ignition fault

    Thats a little quick. May want to revisit the gas pressure. I know that you aren't getting much time with the gas valve open but, you need to see how much the WC drops when the valve opens. You shouldn't get much more than 4 inches of drop between static, and open. EVEN IF the drop is still in the "workable range" printed on the service plate.
    Factory Warranty Station for:
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    and Paramount pool cleaning systems.

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    Re: Pool heater check ignition fault

    I had the gas co test.. they reported as at the appliance. Is the a reasonably priced device you might suggest to test the hookups on the gas valve?

    - - - Updated - - -

    Let's say the gas is low.. what can be done? The utility says pressure is max allowed. Also why would this thing work for years..

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    Re: Pool heater check ignition fault

    There is an adjustment that can be made on the gas valve inside the heater. Over time a very few gas valves will start to go down hill and you might need to tweak but it's somewhat rare. I see them fail all together most of the time.

    I don't see it mentioned here but is this natural or propane gas?
    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: Pool heater check ignition fault

    Quote Originally Posted by evanwellens View Post
    I had the gas co test.. they reported as at the appliance. Is the a reasonably priced device you might suggest to test the hookups on the gas valve?

    - - - Updated - - -

    Let's say the gas is low.. what can be done? The utility says pressure is max allowed. Also why would this thing work for years..
    Not much can be done if your gas service/supply is low. A low water column could indicate too small gas line size, How long has this heater been in service before you made these repairs? If it had been previously been operating normally, gas line size may not be the problem. I think you would also get a little more time before the heater would shut down from insufficient gas pressure, if it fired at all!

    I know i said look at gas pressure before, but at this point, i'm thinking your heater is not reporting flame rectification, or an electronic ignition issue. (Its just) The quick shut down is the only thing that is not inline with a FR problem. You would normally get those 7 seconds from the time you hear the click of the gas valve opening to shutdown.

    See, if the heater (fire or mechanical side) has a problem, the heaters control will give some time, those 7 sec, before it shuts down. the time is engineered into the system to give the heater (fire) a chance to settle down and fire properly in case there is some sort of temporary draft or wind issue. The more i think about this, the more i think it may be an electronic ignition CONTROL problem. The control part is failing. Problem is, you have two areas of control that can be causing this. There is the FENWAL. Basically a box of switches, that may not be holding the gas valve switch closed the entire time they are being told to. Or the main board that does the telling, may not be telling commands consistently (flaky commands).

    Best recommendation: Find yourself a real sharp (meaning old) heater guy. You need a guy that would be willing to swap parts rather than force you to buy new ones regardless if it fixes the problem. Or you could just replace those two items your self with the thinking, well, i feel better knowing that all the electronics are now new, even then, there would be no guarantee that would be the fix...
    Factory Warranty Station for:
    Jandy/Zodiac, Pentair, Sta-Rite, Raypak, Polaris,
    and Paramount pool cleaning systems.

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