GA100 Vaillant gas fired cast iron hot water boiler

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: this is our unit... Its a Vaillant GA100 140 btu's gas boiler. : the problem we are having is, the boiler will heat the hot water tank ok, but once we turn on the infloor heat pump, to heat the house, it will only run for about 24hrs then it shuts down the boiler. We then turn off the breaker, and let things cool down for an hour, and the whole system will run again..( But as I mentioned, if we only run the hot water tank, everything is fine day after day....??) : We have replaced the round synchron unit (pictured below) : seemed to work for a few months, but it burns out, or whatever it does, and the problem continues..... : anyone have any answers....?? : : and this is the other problem....... : these Infloor, (brand) of gray manifolds, and the red pumps leak, we are looking to change to a better system....!!!! : We are in the Seattle area, and looking for a repair person.....!!!!