2 days ago, my gas frunace started to only blow the cold air and the fan
won't stop. A service guy come in and said the control boad is dead and
charge me $400 to replac it. I decided to do it myself. I bought a new
control board ( manufactured by Carrier, an compatible updated version) and
replaced the board. However, still doing the same, fan won't stop and blow
only cold air. I use voltage meter and measured that between the termnial R
and W, 24 voltage. ( I have 6 terminals on the board, C,Y,GC,GH,R,W) and the
wiring are, 1 on C, 2 on Y , 1 on GC, no wire on GH and 1 on R and 1 on W.
My thermostat is the RiteTemp programmable. It is working fine with my old
board. However, after I installed the new board, when I closed the
thermostat cover, ther is no voltage between the R and W on the board. If I
left the thermostat cover open and measure the board R and W, 24 V. I left
the thermostat cover open and put a paper clip to connect the R and W on the
board, burner won't ignite. If I connect the R and the SEC1 on the board, I
can ignite the burned (which is by pass the board). Can someone help me with
Thanks a lot.