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No blower fan

cdn4
cdn4 Member Posts: 4
U have an older guys unit, model # unknown due to blank label. It has an icm 276 blower control module that was installed two years ago. The problem i am having is that after the burners ignite, the blower fan is not coming on. The fan is good because it operates if you switch the thermostat to on instead of auto.

Comments

  • cdn4
    cdn4 Member Posts: 4
    Sorry, older RUUD unit
  • HVACNUT
    HVACNUT Member Posts: 4,856
    Have you tried switching motor speeds on the heat terminal? Could be open windings on the current speed. Or it's the board again. The fan time delay is initiated in the board as soon as there is a heat demand.
  • cdn4
    cdn4 Member Posts: 4
    Tried switching speeds, no luck. When fan should be running all four wires going to the fan have 120 volts. When I switch it to on at the thermostat and the fan is running, three wires have 120 but the wire from the coil terminal in the board only has 57 volts. I also tried hooking one wire to acc and one to unused for same speed and still didn't work
  • cdn4
    cdn4 Member Posts: 4
    Sorry, should be wire from the cool terminal.