Gas and Oil Home Heating Furnaces - furnace short cycles
Doityourself.com community forum was created to provide answers to all questions related to home improvement and home repair. Doityourself community can help you find information about how-to topics on small fixes to large remodeling projects. With comprehensive how-to content and expertly moderated community forums DoItYourself.com makes it easy to tackle even the most complex home improvement projects.View Full Version : furnace short cycles
ClarkBarr
01-27-03, 09:32 AM
furnace runs for 5-8 min, shuts down for 3-4, runs, shuts, runs and so on..... mod #GSU 75 MHN cannot locate, looks like an old Janitrol ??? VERY COLD w/ KIDS.
KField
01-27-03, 11:36 AM
It sounds like a heat anticipator problem. That is a device inside the thermostat that gives off heat to stop the furnace slightly short of the desired temperature. That way the residual heat in the heat exchanger of the furnace can be pushed into the house and the result is temp being exactly what you set it for. If you have it set wrong, it may give off too much heat and stop the furnace way too soon. If you have a thermostat that is not digital, pull off the front cover and look for a small rotary slide resistor or a metal pointer with numbers near it. You should see the word LONGER and an arrow somewhere. Move the pointer a couple numbers toward longer and see what happens. If you need further asistance, post here again.