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Thread: Repaired '92 heater Jaars EPC due to mouse-bitten Thermistor wires

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    Join Date
    Jun 2014
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    Oakland/CA
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    Repaired '92 heater Jaars EPC due to mouse-bitten Thermistor wires

    Reconnected thermistor wires on June 12, 2015
    - Found my pool heater failed to ignite in May 2015. It was working last winter. This is a Teledyne Jaars Series 1 EPC II 400 unit, see Pic.1.
    - Opened the front panel and cleaned mouse nest and debris earlier, and spotted two wires hanging freely. Suspected mouse bites. See Pic. 2.
    - Found manual from the web: EPCEPSSeries1.pdf. Used a multimeter to trouble shoot on Section 5 Page 13.
    - In Step 3, followed the instructions to replace temperature sensing bulb under figure 30, after removing the Top Assembly, found the other two ends of cut wires on the top left of the panel openings.
    - Reconnect two black wires to the Thermistor, and the heater is back to life.
    The black-yellow wire out of the temperature control was also bitten badly by mouse. Use electronic tape to reinforce it. Also cleaned a a lot of debris and prepared mouse trap to remove future mouse threats.

    Last edited by dbg; 06-14-2015 at 12:59 AM. Reason: add a hyperlink
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    15x30 17k gal. gunite/plaster pool, 8X8 Spa, Pentair CCP520 Filter, Pentair WFE4 Filter Pump, Polaris 280 Vac Sweep, Polaris PB4 3/4hp pump, Laars EPC II 400 heater, Intermatic T30404R time clock, Anzen 1hp Air blower.

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    Re: Repaired '92 heater Jaars EPC due to mouse-bitten Thermistor wires

    That unit should be in a museum somewhere. LOL
    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: Repaired '92 heater Jaars EPC due to mouse-bitten Thermistor wires

    Yes, the whole equipment room is a functional museum that I am thinking to renovate. Starting from getting remote control maybe.


    15x30x3'3"-7'10" 17k gal. Gunite/plaster pool, 8X8 Spa, Laars EPC II 400 heater, Pentair CCP520 Filter, Pentair WFE4 Filter Pump, Polaris 280 Vac Sweep, Polaris PB4 3/4hp pump, Intermatic T30404R time clock, Anzen 1hp Air blower.
    ===
    15x30 17k gal. gunite/plaster pool, 8X8 Spa, Pentair CCP520 Filter, Pentair WFE4 Filter Pump, Polaris 280 Vac Sweep, Polaris PB4 3/4hp pump, Laars EPC II 400 heater, Intermatic T30404R time clock, Anzen 1hp Air blower.

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