We have a high pitched whistling sound that seems to be coming from the within the heat exchanger on our Carrier 58MCB. We have had a code 31 and made changes to venting and tried many little things. Code 31 still comes up and the whistling is still thePost created: 2013-02-02 Type of Equipment: Furnace Views: 128
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Whistling sound along with an error code of 31. We have adjusted the exhaust and intake pipe, sloped the furnace more so it is 3/4" sloped down in front, checked the blower motor, venter motor and housing. it sounds like it is coming from the heat exchanger? What can we do?