Bought a new house end of last winter and used the wood boiler a few times with no issues, this year not so much. its an aux system tied into out regular boiler. The wood boiler is a KERR, i belive its a titan model its older and i cant find any model number or paper work on it. On to the problem, the circulator kicks on at 160 and so does the dump zone, and the damper closes at 170 but the temp keeps rising to around 250 and the dump zone base boards only seem warm not hot like the rest of the pipes before it gets to the manifold, and then the presure valve will start to leak, and blow off briefly the plumber chaged the pressure valve last year it was a 45psi and he put a 30 on it but im fairly sure we used it after that. we added an electic water heater last year and had the temp on the bioler turned down so it wasnt running as much thats the only thing differant. everything seem to be working as it should be. Any ideas?