I'm looking for a timer to replace the thermostats for 2 furnaces in a riding arena.

Sounds like the heat anticipator in your thermostat is either bad or out of adjustment. Turn of the furnace power. Remove the thermostat wires from the thermostat. Turn the power back on. Connect the white and red wires together. The furnace should start up. Let it run a couple of minutes. Then disconnect the wires. The burners should shut off immediately. The blower will continue to run for 60 to 360 seconds then shut off. If this happens replace your thermostat. If the burners continue to burn, then your problem is either the furnace or the thermostat wires.

Hello, it could be shutting down on it's high limit switch due to a dirty air filter, dirty blower wheel, weak blower motor. Usually this would cause the furnace to shut down before it reaches the desired temp.

Some noma thermostat manuals appear following link
http://waterheatertimer.org/Woods-timers-and-manuals-old.html#thermostat

If you need further help, I’m available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7

Thermostats used in homes sometimes have a timer built in which will remind you to change your furnace filter. Most of them can be adjusted or disabled. The thermostat has no way of knowing whether the filter is actually dirty, it just reminds you every so often by flashing "filter" on the display.

It is possible to reset the timer, or adjust how often it appears, or disable it completely. Exactly how to do that depends on the make and model of your thermostat. Often, it is simply a case of holding two buttons at the same time for a few seconds.

As to why the furnace doesn't come on, there can be many reasons. The problem likely is not the "filter" flashing on the display of your thermostat. Try resetting the breakers that service the furnace unit itself. Make sure that the thermostat is set to "heat" and the setting is turned up. If the thermostat uses batteries (most do these days), replace them.

If this doesn't work, the following information will be helpful to get the furnace running again:
Brand
Model number
Age of furnace
Location in home
Brand and model of thermostat

sounds like the thermostat is bad.

pknab, I have the same problem. And it comes down a few things: 1) the flashing 1:00 indicates that you've lost power, and the system needs to be reset. 2) Reset means taking out the batteries for longer than 5 minutes. 3) You have to change your filter monthly. There's one in the cold air return and another one in the furnace. If you don't, your FURNACE may be causing number one (my conjecture). 4) We had an electrical storm 2 days ago--nothing else in the house lost its sense of time...but...well...the online operating manual is difficult to find try http://customer.honeywell.com/techlit/pdf/69-0000s/69-1400.pdf or http://dl.owneriq.net/e/e67c2c91-73c2-4bd8-abc8-91d843a27658.pdf (but it doesn't tell us this stuff...I'm still looking for the meaning of the EEE in the display..perhaps I have repowered the thermostat/furnace in the wrong order).

It actually sounds like you may have answered the question yourself. If the mercury isn't breaking contact, then obviously it's still calling for more heat. This is a common problem with the old mercury thermostats and are usually replaced with digital ones that are way more accurate. The are fairly cheap at Wal-Mart and such, and replacing one is basically all color coded.

Try doing both at the same time - leave it off at least 60 seconds. Also while you have the cover off look fo any buttons (reset). If this does not work you will have to replace the thermostat. (Be sure the power is off to th furnace B4 changing the tstat)

It sounds like you may have issues with the furnace. A qualified professional can go over the system and the house to let you know if the system and unit are properly sized. The poor performance of a furnace can be a sign of carbon buildup in the furnace.
Good luck, hope this helps.
Matt

These new furnaces are trouble. Ive been in the htg trade for 25 yrs. The fan is running because they are now controlled by a timer instead of a temperature control. Rather than sensing a preset temperature and turning on the fan, it comes on by a preset time. Couple of things, does either of the doors have an inspection window? most newer furnaces have what is called a smart board. The board will flash a trouble code. ie: 1 long 2 short etc. #1 turn your thermostat to off, youll need 2 people for this! Go to the furnace, If it has the above mentioned inspection window ( usually about 2" round) while peering through the window have someone turn the thermostat to about 80 degrees. Let the furnace cycle and see if it flashes a code. If it does the codes are usually on the bottom door, May be on the inside. The most common cause is either a bad transformer, bad hot surface ignitor or pressure switch failure. Further questions feel free to ask. Steve