Welcome! Here are some tips for using this forum.
WM series 2 Ultra 155 b-25 error code
Ultra 155, TekMar controls, 8 years in service, b 25 error code, outlet temp rise too fast:
Boiler pump, Taco 0014-F1, has 125v at junction box but I cannot tell if water is circulating. Everything else seems OK. Could the boiler pump cartridge be bad?