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-   -   My ruud furnace comes on but the ignitor to lid? (https://www.askmehelpdesk.com/showthread.php?t=777850)

  • Dec 6, 2013, 11:32 AM
    The_man123
    My ruud furnace comes on but the ignitor to lid?
    When I turn my furnace on , my exhaust blower comes on but my ignator will not turn on. The ignator is good and I got a new board.
  • Dec 6, 2013, 05:48 PM
    Grady White
    Do you have 120 volts to the ignitor?
  • Dec 8, 2013, 03:37 PM
    The_man123
    No, it doesn't have 120 volts to the ignitor.
  • Dec 8, 2013, 04:55 PM
    Grady White
    Does the control board blink any sort of code? If so, find the key to that code (often inside the blower compartment door) & let us know what it says.
  • Dec 8, 2013, 05:04 PM
    The_man123
    It doesn't blink , and I got a new board.
  • Dec 8, 2013, 06:19 PM
    Grady White
    It sounds like the pressure switch is not closing. If there are two terminals on the switch, connect your volt meter across them & create a call for heat. Before the exhaust blower starts you should get 24 volts AC. Almost as soon as the exhaust blower comes on, the reading should drop to zero.
  • Dec 8, 2013, 06:24 PM
    The_man123
    Ima try it out (:
  • Dec 8, 2013, 06:28 PM
    The_man123
    It has 24v before the blower starts and when the blower starts it stay at 24v
  • Dec 8, 2013, 07:10 PM
    Grady White
    For some reason the switch is not closing. The next step is to VERY gently suck on the hose going to the pressure switch & listen for a click. If you hear the click, you know the switch works. Remove the hose from the exhaust blower & clean the fitting with a piece of wire or drill bit (not in a drill). Reassemble, try it, & let me know what happens.
  • Dec 8, 2013, 07:20 PM
    The_man123
    Yes the pressure switch clicks but the other side where the hose goes into the blower it doesn't suck air.
  • Dec 9, 2013, 04:26 PM
    Grady White
    Did you try to clean the nipple where the hose connects to the venter?
  • Dec 9, 2013, 06:05 PM
    ma0641
    Sounds like the plenum port is clogged. Clean it out with a coat hanger or sized drill bit.

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