The Honeywell intermittent stack relay on my luxaire oil furnace keeps sticking and my heat stays on

SOURCE: honeywell rth230b won't shut off heat

Sounds like a relay sticking. Possibly in the thermostat or possibly the furnace relay at the furnace. The next time it happens, unplug the thermostat from the wall. If the furnace still runs then it's the furnace relay.

Hope that helps...

Geno

SOURCE: Wiring Diagram for Honeywell ST9103A1002 needed

Are you still in need of this

SOURCE: My furnace works intermittently.

You may have a dirty flame sensor. There are a number of other possible causes as well. Rheem/Ruud/Weatherking furnaces also have problems with the connection on the blower deck.
The flame sensor sometimes must be bypassed around the MOLEX CONNECTOR in the deck due to humidity.
Hope this helps.
Matt
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SOURCE: Replacing Round Honewell Mercury Thermostat

try to get one that is made for oil heat, the installation is easy only two wires, and the instructions make it easy.

SOURCE: Bryant-Carrier Furnace Fan Stays On

Hi, you have replaced the stat several times, and adjusted the anticipator so its not the stat.This is a split gas/elect unit, and working on these for many years and looking at some of the solutions given, they are right.You need to be looking at the Furnace fan control.Units of that age they do tend to stick open and run constantly.I doubt its the fan relay, maybe if you were in the cooling mode.Fan controls are not that expensive. You probably have a Honeywell 7" to 11" Probe, with the auto/manual button, with a temp dial to set you're on off temps. I would inspect the heat exchanger for any signs of cracks or bulging being its that old. If you find any, you are looking at carbon monoxided and should be thinking about an upgrade soon.Also flame roll out.I am thinking of you're safety is all.If you do have this type of fan control, there is a tab that has to be cut before you install for 24v. control.It comes set for 120v. and will burn out all of your 24v. componants.Those old Bryants will run for years. Good Luck!
Shastalaker7