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Glycol System Thermostat Reads 99 all the time and some questions

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  • Glycol System Thermostat Reads 99 all the time and some questions

    I recently noticed that my thermostat on the MMPP4301 is constantly reading 99 degrees and therefore, keeping the pump and cooling system going 24/7. Is this a problem with the sensor?

    I am an unusual (and lucky) user that has a commercial system in his home. MPP4301, MCGA0050RF600B condensing unit, and a blender for CO2/Nitro hooked up to a six tap dispenser. So far, I've been able to have six taps working with no problems. When there is nothing on tap I simply turn off the system.

    As a home user, I often have nothing to serve, so I purge the lines with water, run sanitizer, then water again until I have new kegs to tap. I run water and sanitizer through the lines every 2-3 months regardless of if I have a keg on them or not. But the lines are never a problem. I also change out the glycol every 18 months or so. Should I do it more often?




  • #2
    It could be either a probe issue or a problem with the thermostat itself. What is the actual temperature of the bath?

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