That is the standard reply for all manufactures in the HVAC trade.

Same furnace different problem now. Limit switch went out. It had a Texas Instruments L170-30 7 inch switch. What I found odd was that the middle of the switch had what looks like burn marks and some cracking from appears to be too much heat. When I contacted the local furnace guy he was surprised that it used a 7" switch and not a 3". With the burn marks I begin to wonder if it's right. My Furnace guy was not able to find a L170-30 so I have a 7" L160-30 installed.

I was having a hard time even locating info on this furnace. Anyone have access to figure out what the correct switch should be?

Same furnace different problem now. Limit switch went out. It had a Texas Instruments L170-30 7 inch switch. What I found odd was that the middle of the switch had what looks like burn marks and some cracking from appears to be too much heat. When I contacted the local furnace guy he was surprised that it used a 7" switch and not a 3". With the burn marks I begin to wonder if it's right. My Furnace guy was not able to find a L170-30 so I have a 7" L160-30 installed.

I was having a hard time even locating info on this furnace. Anyone have access to figure out what the correct switch should be?