Model FG6RA 096C-12B

The furnace in the house runs about 8-10 minutes, shuts off and then restarts almost rightaway about 30 seconds,
I have watched the mercury switch and it stays on the side that says it should stay running..
Why does it shut off and then restart and not just stay running?
Usually after it runs a second time for about 5 minutes , the mercury switch moves the system shuts down...

What spare parts should I keep aroundthe house?

Furnace has did this since day one


THANKS GREG
Bonnyville, Alberta
Canada
1-780-826-7562

Sounds like the heat anticipator needs to be set so the unit runs longer. What is the exact brand and model number of thermostat?

Spare parts is hard to say unless you have them all you will never have the one you need to fix it when the time comes. LOL You know the drill. I would have one ignitor as a spare for sure.

Sounds like the heat anticipator needs to be set so the unit runs longer. What is the exact brand and model number of thermostat?

Spare parts is hard to say unless you have them all you will never have the one you need to fix it when the time comes. LOL You know the drill. I would have one ignitor as a spare for sure.



Inside the thermostat just behind the outer cover of these types of thermostats you will see a heat anticipator. It looks something similar to one of these two:
http://www.longviewweb.com/htanti1.jpg

These adjustments are the heat anticipator. They are for the length of the cycle of the heating, but sometimes there is one for the cooling. But almost always, the cooling anticipator is a fixed resistor on the subbase. It's a very critical measurement with special instruments for the professional. Don't worry, you can set a replacement thermostat heat anticipator just like the old one or you can make adjustments in very small increments as instructed here.

HEAT CYCLE TOO LONG--Set adjustable heater to a slightly lower dial setting. (1/2 division)
HEAT CYCLE TOO SHORT--Set adjustable heater to a slightly higher dial setting (1/2) division)
YOUR thermostat should look like the picture on the left inside. Use the directions in number 2 since your heat cycle is to short causing a problem with your system. Move the lever just a little bit at a time to the longer side on the little dial till the unit works correctly. It may take a few furnace cycles to ballance so do not rush the job by moving the lever to fast. Move the lever and wait 15-30 minutes for the results.
There is a professional way to do this adjustment but involves a meter which you do not have.

It is a White Rodgers TYPE 1E56W-309

Not sure of model # maybe LR27935

Currently the anticipator points to .8

I have a picture of the inside..

HEAT CYCLE TOO SHORT--Set adjustable heater to a slightly higher dial setting (1/2) division) And try if not enough go higher till happy.