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Lennox furnace that has a loud buzzing noise when running to reach desired temperature.

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  • 14 Answers

I would start with some basic maintenance shut off. open front pannels vacuume out all accesable areas.use a plastic nozzle with a paint brush to loosen dirt.Change or clean filtration system follow manufactures cleaning procedures.Oil the bearings on blower motor and squirel cage.Then visually inspect any arking witness marks for loose connections.Start it up and listen for improvements.

Posted on Nov 28, 2012

6 Suggested Answers

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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Posted on Jan 02, 2017

  • 306 Answers

SOURCE: How to test for 24 vac between R and C

Yes you are right the control voltage of your furnace is 24 volts. Really without a load on the transformer usually runs 28 volts then you put a load on it and it drops down to 24-26 volts. Check the voltage between the R terminal and the W terminal with the selector switch in heat mode. Or move the thermostat switch to heat. R to C would do it also. You could also do the voltage check right at the transformer one side of the transformer is 120 volts and the other side is 24. Look for the black and white wires that is the 120 volt side the blue and yellow or off colors is the secondary side.

Now if it checks low say 24 or 22 your gas valve needs min. 24 volts to hold open the valve that allows the gas to flow into the burners. So if one of the symptoms is related to burners come on for about 3 to 5 min. then shut down and the fan keeps going it is loosing the necessary voltage to hold open the gas valve.

One more thing make sure the air filter is clean as this will cause the heat to build up in the heat exchanger and hit the high limit safety device and cut the gas off. Until the air cools enough to allow the high limit to reset then the gas valve will open and start the process all over again. Dirty A-Coil will do the same thing as the air goes through the coil to get to house. let me know how it goes ken

Posted on Jan 18, 2009

tborn6
  • 700 Answers

SOURCE: Furnace doesn't reach desired temperature

On the thermostat if its a manual on then pop the cover off and look for a small dial with numbers on it. Take and move it tpoi a higher number than whats it is set at. Its called a heat anticipater and is supppose to make it so that the unit does not oveshoot or under shoot like what your experiencing. If its a digital oine then you are going to have to configure the setting in the insdtallers menu.

Posted on Dec 21, 2008

pierre1811
  • 144 Answers

SOURCE: Electric furnace runs but won't shut off on heat setting

I would insist that Sears either have a Senior tech come out and fix it or return it to the state it was prior to them touching. Then call some one else. Have them involve the Goodman rep in your area.

Posted on Jan 20, 2009

  • 3 Answers

SOURCE: Ruud Electric Furnace Cannot Reach Setpoint - "Watt Restrictor"?

unfamiliar with watt restrictors.
heat strips have 2 safety devices, a thermal overload, they get to hot they shut off, cause not enough air flow increase fan speed this device is auto reset. a fusible link a fail safe to thermal over load, no reset and sometimes replaceable. if this does not help would like to ask you a few questions. one of the buildings i take care of has 200 + reem/ ruuds all electric heat. if a part is defective replace, please do not by pass. safety frist.

Posted on Mar 07, 2009

  • 53 Answers

SOURCE: drip pan wet furnace filter lennox air handler

verymuch so it is clogged up , now open system treat drain pan with bleach ,blow out two lines if there are available but if theres only one treat that on ,then treat the coils clean an treat them after cleaning pour little bleach in the bottom of the pan

Posted on May 24, 2010

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I have a Braeburn 3200 and when the the temperature reaches the desired heat setting. The furnaces heat will shut off, but the fan will continue to run indefinetly. eventually blowing very cold air up


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Is it normal for my furnace to have burner cycle once or twice


That sounds normal. When the bonnet reaches a preset temperature the burner turns off then when it cools down a bit the burner turns back on. Clean filters etc will help to keep the burner on longer in a cycle.

Aug 24, 2014 | Heating & Cooling

1 Answer

Fasdfas


Does the furnace stays off?.
Furnace are ment to cycle on and off because of limits .If you set to 70 furnace would cycle several times before reaching that temperature.
Just make sure your filters are clean and you got proper return air flow because lack of air flow will cause furnace to shut off sooner than normal

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I have a lennox 2 stage gas furnace and a lennox XP15 heat pump controlled through the Lennox 7000 touchscreen thermostat. I want to disable the heat pump due to excessive noise due to lower temperature...


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My furnace kicks on, runs a little while, kicks off, then kicks on again until desired temperature is reached


it could be the thermostat on the wall not working or the fan control is not working as it should also check to see if air filter is blocked

Oct 24, 2010 | Dayton Gas Furnace Heater

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