I have a goodman air handler. When my t-stat call for cooling my blower will come on but my condesing unit would not turn on. I also notice my exhaust fan in the furnace come on at the time too. I do have 24v supply to the board but when I check red to ground at the board with out t-stat connecting to the board my meter only read 15v and green to ground i got 11v. After replacing the board I got the same out put voltage. What seem to be the problem?