Question about Amtrol ST-120V-C THERM-X-TROL ASME Expansion Tank, 68 Gallon

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ER3 no hot water

No more hot water coming out Amtrol classic boilermate reads:ER3

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Er3 means that the water is being heated for more than 1 hour without reaching the set temperature.
Need new aquastat.

Posted on Dec 28, 2010

  • Brent Michalski
    Brent Michalski May 29, 2017

    It tells you that your water heater called for heat for more than an hr and never got hot enough to meet the demand. Don't always need to run and change the sensor these are the causes
    CAUSES

    -bad sensors
    -no hot water from boiler
    -bad thermal transfer
    -low delta T across water heater

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