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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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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

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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.


Posted on Dec 07, 2008

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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

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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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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

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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!!

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