Boiler will not cycle, w/not shut off - Bunn VPR Coffee Maker

sounds like the hot water sensor is shutting down early .also check flame sensor is clean .

Boiler thermostat should be set to high

Don't know your specific unit, but in general, heating systems are two-stage devices:

1: Its too cold: the motorised HW/CH valve moved to the required position, and on achieving it, the circulaion pump starts and the boiler is enabled. (The circ pump may start immediately - its not usually important.) The hot water from the boiler circulates through the heat exchanger and/or radiators until the thermostat thinks its target is warm enough, whereupon it disables the boiler, stops the pump and closes/relaxes the valve(s).

2: The boiler is off while disabled. When enabled, it heats the circulating water to a 'high' temperature and seeks to keep it there. If it reaches that temperature, the boiler will cycle on and off as necessary to maintain the set 'high' temperature. (The circulation pump must run all the time the boiler is enabled.) This may be what you're noticing. Additionally, some boilers will run the circulation pump for a little while after being disabled to reduce the temperature if the water in the pipes and boiler.

Your question doesn't say how the pump running corresponds to thee thermostat settings, but if it were stuck on, I think you'd know!

a lot of boiler systems the stats do not shut off the boiler, but once the boiler water temparature is reached its fully heating tempaerature of 180 deg fahr, then it,ll shut off

There are many ways for a hot water boiler to be controlled. One of them is to have an 'on-board' aqua-stat that cycles the boiler burners to maintain water temp set-point and the space thermostat controls only the circulating pump. There is no way of knowing if yours is set up this way, but try turning the thermostat on and off and see if the circulating pump cycles with it.

Volumns can be written on boiler control but with the limited information provided we can only guess.

rapidly? seconds or minutes.
Make sure you select hot water boiler in the thermostat setup. That can cause short cycling. Boiler need a longer cycle range. If not, remove stat and jump wires, Isolate the problem, is it stat or boiler?

Check the heat Antisapator on the thermostat, or replace the thermostat.

this sounds like the boiler is in comfort mode press the eco/comfort button once and eco will be dispalyed on LCD. also check terminal 3 and 4 have no wires on the terminal strip as this is were the OTC is connected to boiler.

boiler does not shut off when thermostat reaches temp, i already replaced aquastat but condition still exists