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Thread: Pentair Master Temp 400 - difficulty starting after rain

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    cwuffman's Avatar
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    Pentair Master Temp 400 - difficulty starting after rain

    It seems that after any heavy rain the Master Temp 400 tries to fire up and then quickly shuts gas off to burner. The pattern seems to be that after 3 attempts it quits trying and says service necessary. After I manually turn the unit off and then on again it will again try to start 3 times, and usually will be successful on one of these attempts. I am a bit surprised that rain should be a problem since these units are designed to be outdoors. Does anyone know what the interlock device is that is causing the shutdowns?
    29,000 gal rectangular Pebble Sheen in ground pool with raised spillover spa,3hp Pentair variable speed pump, Polaris 280 cleaner with booster pump, Pentair 520 cartridge filter, Pentair Master Temp 400 heater, Stenner 45MPHP10 Peristaltic Pump, TF-100 Test Kit & Speedstir

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    mrcarcrazy's Avatar
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    Re: Pentair Master Temp 400 - difficulty starting after rain

    I'd take the front cover off and see what isn't happening. getting spark?

    http://www.pentairpool.com/pdfs/MasterTempOM.pdf

    pg 38
    IG gunite/plaster pool/spa Started 1/17/14, Plastered 5/16/14
    Size: 12'-21'x39' free form, depth ranging from 4' to 7, attached 6 person spa with spillover.
    Equipment: Whisperflo 2hp pump, Pentair 30" sand filter, Pentair Mastertemp 400k BTU heater, 1hp Whisperflo for waterfalls, and a blower for spa floor

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    cwuffman's Avatar
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    Re: Pentair Master Temp 400 - difficulty starting after rain

    Sequence is: Blower comes on; short wait, then gas comes on and ignites (you can hear ignition and feel the heat); gas shuts off after 2 or 3 seconds and blower remains on; waits maybe 30 seconds and tries again. After total of 3 attempts, the requires service light comes on and no further attempts are made. I turn heater off and wait 30 seconds, then turn on Spa. Process repeats unless successful, then it stays on as normal. Seems like something is drying out in the short burn times.
    29,000 gal rectangular Pebble Sheen in ground pool with raised spillover spa,3hp Pentair variable speed pump, Polaris 280 cleaner with booster pump, Pentair 520 cartridge filter, Pentair Master Temp 400 heater, Stenner 45MPHP10 Peristaltic Pump, TF-100 Test Kit & Speedstir

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    Re: Pentair Master Temp 400 - difficulty starting after rain

    Quote Originally Posted by cwuffman View Post
    Sequence is: Blower comes on; short wait, then gas comes on and ignites (you can hear ignition and feel the heat); gas shuts off after 2 or 3 seconds and blower remains on; waits maybe 30 seconds and tries again. After total of 3 attempts, the requires service light comes on and no further attempts are made. I turn heater off and wait 30 seconds, then turn on Spa. Process repeats unless successful, then it stays on as normal. Seems like something is drying out in the short burn times.
    http://www.troublefreepool.com/threa...ff-in-Spa-mode
    http://www.justanswer.com/hvac/3b5hj...-min-cuts.html

    couple things to try.
    IG gunite/plaster pool/spa Started 1/17/14, Plastered 5/16/14
    Size: 12'-21'x39' free form, depth ranging from 4' to 7, attached 6 person spa with spillover.
    Equipment: Whisperflo 2hp pump, Pentair 30" sand filter, Pentair Mastertemp 400k BTU heater, 1hp Whisperflo for waterfalls, and a blower for spa floor

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    ps0303's Avatar
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    Re: Pentair Master Temp 400 - difficulty starting after rain

    Open it up and inspect all of the wiring to see if anything is bare. Maybe you had a mouse in there eating things. It happens often on these units and the Maxitherms.
    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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