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Get a thermometer and check the water temperature. It sounds like the gauge is bad. It is my experience that in a whole box of used ones, one might work properly. Also check the lower hose. On my pv's, they have a tendency to collapse. A new one with the wire in it solved the problem. I am not sure exactly how the 122 is set up, but pull a heater hose off and see if you are getting water movement. Could be the thermostate is in upside down or stuck shut. Too much silicone can clog it up.
Let us know.
Leonard
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