Furnace Short-Cycling
2018 Furnace - Atwood/Dometic model AFSD20141 is short-cycling. I tried the following everything: Jumped the thermostat jumped the high temp limit switch jumped the sail switch removed disch...
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agiannetti wrote:
Also, to answer your question, system NEVER shuts down, just short-cycles.
Regarding that restrictor inside the exhaust vent tube, which decreases the inside dimension of the tube to about 1/2" diameter, do you know it's purpose? When it's removed, no more short-cycling. Can I just remove that restrictor permanently?
Check the space between the two tubes to see if it that space is restricted by something that should not be there. Closing the outer door may shut that part off, and opening the door may let enough air through?
The exhaust vent tube in my 1990 8531 does not have a "restrictor" for the inside tube or in the space between it and the outer tube.
It is two tubes one inside the other with a space between the inner and outer for air to pass through. (Incoming air I guess ????) When the furnace is on, the hot air coming out of the inner tube exhaust is very hot. I always think that is such a waste of heat, but no way to capture it.
The only restriction inside the inner exhaust tube is a small metal part where a sort of bracket holds the two tubes together.
Here is a photo of the inner end of the tube assembly from my spare 8531
