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I have a Navien CH-240 that makes a whistling noise when it cycles up.. appears to be coming from the burner or heat exchanger. Any thoughts?

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6ya6ya
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Posted on Jan 02, 2017

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SOURCE: no fan

Their may be several problems here. 1. The Thermostatic fan control in the furnace may be bad or.. 2. The fan motor could be defective or.. 3. The circuit board which controls all operations of the furnace could have burned out or.. 4. The blower compartment door is not closed completely.

Think with me Kiki.. If you have removed the blower door to replace filters lately, then #4 is most likely. There is a button that will be depressed when that door is closed correctly. It is very sensitive, and very common to your problem. Make sure the door contacts this switch/button. A schematic of the furnace can be found on the back of this door. If you need more advice get back to me.

Ray


Posted on Dec 07, 2008

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co7196
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SOURCE: A 1979 Colman RV furnace. Blower shuts off shortly

The fan limiting switch is acting up. It should stay running until lower temp is reached. It will cycle until the temp stays below or at the low setting. Limit switches are adjustable.

Posted on Jun 09, 2009

  • 2597 Answers

SOURCE: Worcester Bosch 35CDi II banging & wild pressure (CH only)

Hi try bleeding the pump it sounds like air in the pump , but worcester do have a free tech help line look for there wed page on line hope this helps

Posted on Feb 17, 2010

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1 Answer

Making a whistling noise, how do i fix it??


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Unfortunately that means there's a hole in the heat exchanger, particularly in that cell of it. When the main blower comes on the air is pushed into the heat exchanger, causing the flame rollout. A heat exchanger crack or blowout is usually what condemns a furnace for good. Goodmans however, have a lifetime warranty on their heat exchangers, so you'll probably be able to find someone to replace it pretty cheap, or do it yourself for free.

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When the burners ignite, within one minute it starts making a loud banging noise and then the HS code comes on and it shuts down. the noise continues for about 15 to 30 seconds after the burners shut...


This sounds like a low water flow situation. The heater is telling you that the high limit sensor is curring heater operation. The noises are the heat exchangers boiling the water either due to a blockage in the exchanger , a bad mixing vlve, or most likely poor water flow. This is tough to troubleshoot through a posting like this, but 1st thing is 1st. Check your water flow and make sure it is minimum 50 Gallons per minute.

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We have a tempstar down draft furnace. 2 years ago the heat exchangers where replace because we were told they were cracked. This year the downdraft motor was makikg a lot of noise & we were told the...


Sounds like the low limit or high limit is out these control the fan motor.They are usually set to kick on around 150 degrees and set to go off around 95 to 100 degrees. Over heating does happen with cracked heat exchangers and it can possibly take these two items out. Normally your furnace should run approximately five minutes or a little less then your fan motor comes on and then for cooling down burners should drop and the fan motor should run again roughly five minutes or so then shut down. Times may vary as to your settings.

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Worcester Bosch 35CDi II banging & wild pressure (CH only)


Hi try bleeding the pump it sounds like air in the pump , but worcester do have a free tech help line look for there wed page on line hope this helps

Feb 16, 2010 | Heating & Cooling

2 Answers

Open rollout


If your roll out is open it is due to it over heating. Your burners when they are lit are rolling back and opened your roll out. You need to check your exhaust venting to see if is clear(no restrictions). Also, your heat exchanger could be cracked enough that when your indoor fan comes on it puts enough positive pressure on your exhaust that it won't exhaust correctly. One way to check for a cracked heat exchanger is to watch the burner flames when they are lit and see if they move(flutter) or come back toward you when the blower fan starts to operate.I hope I was able to help you!!

Nov 17, 2009 | Goodman GDS80904BNA Open Flame Heater

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