Furnace will work fine for 8 to 10 hours, then after last cycle, will not restart. I have replaced the t-stat, and the on-off power switch at the furnace. I also found a short circuit under the mian power switch, and repaired that. Thought I had this thing licked, but it ran fine thorugh the night, then sometime this morning, the home began to cool off, and the furnace would not kick back on by itself. Now if I turn off the furnace, and turn off the breaker, then turn them back on, the furnace will kick back on and run fine for another few hours. This unit is a Coleman Presidential III 7900 series, standing pilot furnace.
You might want to check the filter, if the filter is restricting the airflow the furnace will over heat and it will shut down. if you turn it off and on it will reset it and it will try again. Pull the filter out half way and try that, if it runs fine then clean the filter or get a less restrictive one.
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Do not run contentiously during heat mode. the fan runs at a slower speed with heat and heat fires first then the fan cycles on during heat cycle then when heat satisfies the thermostat the heat will cycle off and fan will run for a couple more minutes and then cycle off. So set stat on fan cycle to auto.
yes, replace your stat but also make sure your wire going to y on the stat has not shorted with the wire going to the w on your t-stat. To check to make sure remove the t-stat and short the wire going to r to the y wire and the wire going to the g terminal if it has that. if cooling works with no heat it's more than likely in the stat, if heat comes on then you may have other wiring, circuit board issues
Is this an oil or gas fueled furnace? All heating appliances have several safety switches in the controls. Flicking the on/off switch (assuming you mean the emergency toggle switch) is not resetting the burner. If you pressed a button near the red light,that MAY have been the primary control reset. Your problem could be anything from the main power switch to one of the many controls with a wiring or sensor issue. Or even a t-stat wire problem. Regardless, a thorough technician should be checking the entire circuit, from the t-stat to every control in the circuit. Including every wire. Lastly, a qualified licensed technician should never diagnose without being in front of the appliance. Hope this helped :)
Hi, these mechanical thermostats have what is called a heat antcipator on them. If you remove the cover you will see in increments or numbers such as 1.0, o.1, .2, .3, .4 or o.1, 2, 3, 4, . The stat and main gas valve work together and have to draw the same amount of amps to cycle the unit properly. This stat will have a copper arrow pointing at a number. A good place to start is to set it at .4. If the unit does not cycle right, set it at 1.0 and go from there until it cycles. Let it go through several full cycles during each time you adjust it until it is correct. These are good dependable stats as I have many on my service truck. If it doesn't take care of the problem, take it back and return it for one that is not faulty which happens often. Best of luck to you. Ps, the small manual that comes with a new stat has that information on it, anticipator settings. Shastalaker7 A/C, & Heating Contractor
if it is a mechanical thermostat the heat ant. does that on cheaper digital tstats it is set by span and on better stats like honeywell model 5000,6000,8000 series you set the cycle rate. what kind and model number is tstat
Its still hard to say from your info...does it seem that the furnace is running a normal cycle except for the fan???...could be a wiring problem , circuit board/relay problem , or fan control problem....really the make and model of the furnace and age would help ....could be several things....does it heat your house to the correct setting??
Sounds like your repair man ripped you off. He should have stood behind his work.
1. I would try to clean the flame sensor located just below the burners. It is connected to "one" wire (Not the two wire) clean rod with sandpaper.
2. The old and thermostat could have a had a bad heat anticipator. if the new t/stat is not digital the heat anticpator on the T/stat needs to be adjusted. slide the small adjuster arm under the cover to about .6 or .7 and see if the solves the problem. if the t/stat is digital it should be preset from the factory.
3. last resort have a service man check your pressure swith. could be a slow inducer motor, blocked or bad vacum line, or a restricted drain or flue pipe.
Is this furnace standing pilot or electronic? if standing pilot turn power off then take t-stat off wall and connect the wires labeled r and c together and see if that keeps furnace working. If electronic check flame sensor you can check flame sensor buy cleaning with steel wool. if that doesn't work then try t-sat.