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Thread: Heater won't fire.

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    Join Date
    Apr 2015
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    Chesterfield, mi
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    Heater won't fire.

    Pentair MiniMax ch 200m, not sure the last time it was used. Just bought house in October. Pilot will light, but heater does not kick on. Thermostat as a little red light on the back that is on. What does this mean?
    34x18 doughboy (desert springs) above ground. Has deep end, but don't know depth yet. Pool came with house (first season). 22in sand filter (250lbs sand)with 1.5hp two speed pump. Pentair MiniMax ch 200m heater.
    440 gallon Emerald spa. Currently a 3.6hp, 2 speed, 46y, 240volts motor. Changing to a 3hp, 2 speed, 56y, 240volt motor.

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    TFP Guide

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    Jun 2012
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    western NY
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    Re: Heater won't fire.

    Do you have and know how to use a volt/ohm meter. There are several safety switches in the circuit that all need to be checked. I believe the pilot on this unit is controlled by the Power pile. You need to verify the voltage from the power pile with the flame on it to see what it is. Ideally it should be 750 Milivolts. This is used to prove the pilot is on and supply voltage to the gas valve. My first suspicion is that there may be some corrosion on a terminal(s) in the safety switch circuit. Another possibility is the pressure switch is not seeing sufficient pressure to close that switch. Do you have a 2 speed pump? If so try running it on the higher setting.
    Unknown make 18' above ground (bought used in 1999) Sparco sand filter. Hayward 100,000 BTu heater. 2 speed pump

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    BoDarville's Avatar
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    Jun 2012
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    Re: Heater won't fire.

    Appears that you are getting power to the heater. Why the main burner is not kicking on could be caused by a number of things. Here are a few possibilities:

    1. A bad thermocouple
    2. The pilot may light and stay lit but the pilot flame may not sufficiently warming the thermocouple enough to open the gas valve to the main burner. If the tip of the flame curls away from the thermocouple, this is a distinct possibility.
    3. The main burner could be plugged with debris
    4. The gas valve to the main burner may be stuck closed
    5. There could be a sufficient level / pool of moisture in the burner or elsewhere in the unit


    As an FYI to anyone else reading this, I would make it a point to run the heater periodically (as long as your pool is "open" and not winterized) even for just a few minutes at a time. This will help keep the main burner clean and burn off any moisture that may be in the unit. It will also exercise the burner valve to reduce the likelihood of it seizing either in the closed or open position. If you winterize your pool, I would at least put a cover or tarp over the heater to keep as much moisture and debris out of it.
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    Join Date
    Apr 2015
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    Chesterfield, mi
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    62

    Re: Heater won't fire.

    I do have a multimeter and am great at following instruction. Just need to know what to touch where to test each safety.
    34x18 doughboy (desert springs) above ground. Has deep end, but don't know depth yet. Pool came with house (first season). 22in sand filter (250lbs sand)with 1.5hp two speed pump. Pentair MiniMax ch 200m heater.
    440 gallon Emerald spa. Currently a 3.6hp, 2 speed, 46y, 240volts motor. Changing to a 3hp, 2 speed, 56y, 240volt motor.

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    Smykowski's Avatar
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    Re: Heater won't fire.

    Not to sound like Captain Obvious, but have you checked the owner's manual? My Hayward manual has service level diagrams and troubleshooting trees that helped me with my heater a few years ago.
    33' round, 23,000 gal AG vinyl , 1HP 2spd PowerFlo Matrix downsized with 3/4HP impeller (X2), Hayward S180T 150# sand filter (X2), Hayward H250 NG heater Pool Store year 1 - $850 for 2 months; Pool Store year 2 - $440 for 2 months, TFPC year 1 - $170 for 4 months; TFPC year 2 - $95 for 4.5 months
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