We need more information. Like what sort of equipment you have. I just saw our other post where it only says Master Temp as your heater type. Please add the specifics here.
I am going to delete the other thread as there is nothing in it to go on. Please ask and fill in your equipment details using this thread.
I assume you have set the heater so it's target temperature is higher than 71 degrees?
Do you have a heater bypass? If there is a bypass and it is currently setup to bypass the heater, that would prevent the heater from working correctly.
What does a heater bypass look like,is it equipment connected to my heater or is it like a computer command I could have accidently initiated from controll panel?
A heater bypass is plumbing external to the heater which can be set (with a valve) to route water through the heater or past the heater. If you are unsure a photo of the plumbing connected to the heater would make it very clear.
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