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    Steve Mac's Avatar
    Steve Mac Posts: 6, Reputation: 2
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    #1

    Jan 5, 2008, 04:12 PM
    Gas Furnace Clicking Relay, Will Not Start
    I have a 20+ year old Kenmore Natural Gas Furnace (intermittent ignition) (model 867.769030).

    It just started a rapid, constant clicking and will not start up, and makes no other noises.

    The clicking is coming from sparking in the combustion air relay.

    Any ideas of what the problem may be?

    Thanks in advance.
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
    		  
    #2

    Jan 5, 2008, 06:10 PM
    Here is the Sears part site. Just put you model number in. There will be a diagram or part number list.

    Welcome to the Parts Store

    It could be a flame sensor or a plugged up pilot orifice. Go and check the pilot orifice first.
    Steve Mac's Avatar
    Steve Mac Posts: 6, Reputation: 2
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    #3

    Jan 5, 2008, 06:48 PM
    I noticed that the exhaust/combustion air blower does not start blowing. Should that kick in before the gas starts. If it should, is there anyway to trouble shoot it without replacing it.
    cmedvec123's Avatar
    cmedvec123 Posts: 14, Reputation: 2
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    #4

    Jan 5, 2008, 07:08 PM
    Check to see if you are getting power to inducer motor if you get 120v and motor not coming on motor is bad and needs to be replaced... that is first in sequence of operation
    Steve Mac's Avatar
    Steve Mac Posts: 6, Reputation: 2
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    #5

    Jan 5, 2008, 07:53 PM
    When I depress the interlock switch that the blower compartment door usually engages, while checking for power at the plug that the wires from the motor plug into, I get power that cycles on and off very quickly - at the same speed the sparking is happening in the combustion air relay in the control panel. Is this normal, or maybe the relay is bad?
    cmedvec123's Avatar
    cmedvec123 Posts: 14, Reputation: 2
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    #6

    Jan 5, 2008, 07:56 PM
    It does sound like bad relay,should never see sparking on any electrical control
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
    		  
    #7

    Jan 5, 2008, 07:57 PM
    Check or replace the relay. I was thinking you said the door swirch was not working.
    Steve Mac's Avatar
    Steve Mac Posts: 6, Reputation: 2
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    #8

    Jan 5, 2008, 08:50 PM
    The door switch is good because I get steady power on the upstream side when the switch is engaged. I bypassed the relay and got steady power to the blower motor. It didn't start. Still not sure if the rapid, constant clicking in the relay is a sign of a bad relay or just caused by bad blower fan. However, now it sporadically does nothing when I engage the door switch, and I have to keep the button on it's face pushed in to allow power to flow through it. I'll assume either one, or both, need to be replaced, and post how it turns out.
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
    		  
    #9

    Jan 5, 2008, 09:45 PM
    Clicking of the relay could also be from low voltage. Check to make sure you have 24 volts for your control circuit.
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