Ask Experts Questions for FREE Help !
Ask
    youngs32's Avatar
    youngs32 Posts: 1, Reputation: 1
    New Member
     
    #1

    Feb 24, 2011, 01:38 PM
    Lennox gas furnace makes knocking noise before igniting?
    When our lennox furnace first starts up it makes a banging/knocking noise anywhere from 1-5 popping/knocking/banging. This doesn't always happen but quite often. Any suggestions? We were told it could be the pipes up in the attice expanding but we have thoroughly wrapped/insulated them.
    T-Top's Avatar
    T-Top Posts: 1,871, Reputation: 100
    Ultra Member
     
    #2

    Feb 25, 2011, 06:06 PM
    Is the noise right when the burners light? Or is right when the blower starts? If it's a 90% furnace you may hear expansion from the pvc pipe if it was not hung and supported right or pipe pinetration may be to tight. If its after the blower starts it's a air flow problem--check all return air filters.

Not your question? Ask your question View similar questions

 

Question Tools Search this Question
Search this Question:

Advanced Search

Add your answer here.


Check out some similar questions!

Water line makes Knocking noise [ 3 Answers ]

Every time one of our toilets if flushed, the water line makes a knocking noise.  It never use to do that until we replaced the flapper and flushing valve.  Does anyone know what this might be?  It's very loud! ::)

Gas Trane Furnace makes loud clunking noise when goes on and off [ 6 Answers ]

I have a gas Trane furnace, new in 2004, it has started making a loud clunking noise when it starts up and when the cycle ends. What is this noise, and how do I remedy it? I have a new filter that I can put in. Thank You. Sheri Tavens

Goodman gas furnace not igniting [ 1 Answers ]

Suddenly the furnace is not igniting, we can light it manually and the furnace kicks on, but once it reached the desired temp, it will not ignite itself when the temp goes back down. Where do we start troubleshooting?

Lennox heat pump makes noise, slow condenser fan [ 1 Answers ]

Lennox, 20r-48 heat pump ac, roof mount in Phoenix, AZ outside temp 30-65 deg f. My heat pump makes a howl noise from the condenser fan and the fan speed is slow. Condenser coils frost outside but I haven't looked at the coils this time of the year in the past due to no need, (good performance and...


View more questions Search