furnace wont stop curculating

jstp89 · 01-22-2008, 09:58 AM

when the thermstate shuts off the furnace keeps heating only in one zone. it shuts down eventually think it could be the honeywell relay that i replaced last year

bigMikeB · 01-22-2008, 06:03 PM

What kind of system is it? How many zones? How is it zoned? What was the relay you replaced for?

chris75 · 01-22-2008, 06:52 PM

Is this a boiler or a furnace? and if it is a boiler is the boiler just shutting off on high limit but the tstat in not yet satisfied?

jstp89 · 01-23-2008, 02:06 AM

its a bunham oil furnace two zones upstaires, downstairs
this problem is only happening upstairs. when heat is called for it starts curculating. when the thermostate is satisfied it just keeps curculating. but it does shut off at about 71 degrees, when the thermostate is set at 66. i even disconected the thermostate wires and it keeps heating. the relay is honeywell R8182D

bigMikeB · 01-23-2008, 06:12 AM

It's a burnham oil fired "boiler". So you have two relays?
Have you opened both covers and seen if they are both pulled out when the boiler is running? If so look for a short in the burner circuit.