My tankless rheem paloma is giving a code 21 in a-1 it is a natural gas indoor. What does this mean and is there something I can do to fix it or do i have to call a plumber
Water Heaters - Rheem - Paloma PTG-74PVN / RTG-74PVN Natural Gas Indoor
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Answers & Comments
Look up the code in the installation manual or on the inside panel of the heater---usually the codes are located on the inside panels of heaters or a label somewhere on the heater's inside or in the manual