My Rheen furnace ignitor glows red, the gas is lit & is blown into the heating duct by the fan for about 3 seconds. Then the ignitor stops glowing red & the gas stops flowing. The furnace goes through this cycle 3 times, then stops altogether. WHY?
2007-01-13 04:27:54 · 4 answers · asked by Anonymous in Home & Garden ➔ Maintenance & Repairs
Your furnace has to know it is lit in order to keep the gas valve open.
There is a thermocouple somewhere in the flame path. If this thermocouple craps out or it's recieving unit stopped working, it will close the valve to keep you safe. If it doesn't get hot enough, fast enough you shut down.
That is why you can burn for a little while. Locate T/C termination point. Make sure these connections are good and tight. Take note of what wire came from what terminal. They should be color coded. If not mark them somehow. Unwire it at the terminal and check the 2 wires with a continuity meter. If the reading is very high IE megohms or open alltogher, then there is your problem. Replace T/C. Make sure the terminations are nice and tight. If the T/C has a relatively low reading it is probably good.
T/C s create millivolts when the 2 different conductors are put together. As this point is heated and cooled the mV reference changes. Unless you have a very good meter, you probably won't be able to see this, as the readings are very low.
If the T/C is good AND in the original position from the factory, then the receiving unit is probably bad.
Remember, your unit is shutting itself down to keep it from filling up your house with explosive gas and killing you. If you are in any doubt, please call a qualified repair tech. He will probably charge no more than $ 75.00 an hour and he should only be a couple of hours.
Good luck and be careful.
2007-01-13 05:09:09 · answer #1 · answered by dave t 2 · 0⤊ 1⤋
This is something you want to get a licensed proffesional to look at. It sounds like a temp limit switch is shutting it down. New furnaces have so many different fail safes in place and it could be any one of them. Best let a pro handle this one.
2007-01-13 04:45:34 · answer #2 · answered by crackymcrackin 2 · 1⤊ 0⤋
the problem is your flame sensor .it is a small rod that is right next to the igniter take a riece of Emory cloth a clean the rod gently .do not move its position .[make sure the furnace is off at the switch first]
2007-01-13 05:05:26 · answer #3 · answered by ata31254 3 · 1⤊ 0⤋
have a heating technician replace the thermocoupler
2007-01-13 17:17:10 · answer #4 · answered by LARRY G 1 · 0⤊ 0⤋