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The gas furnace cycles on and off while trying to come up to set temperature. I replaced the theromastat but the furnace still cycles. What part needs replacement. Both the red and yellow lights are lit.

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Hi,

Here is a tip that will help you try to figure out why your furnace is notworking.

BasicFurnace or Heating System Troubleshooting

heatman101

Posted on Apr 01, 2011

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Have Gibson furnace runs cycle but seems don't get hot enough out of vents check all 115 degrees at vents use to lot hotter old furnace you couldn't stand on vents now you can easily


Is this a gas furnace ? Newer high eff. gas furnaces do have cooler outlet temperatures. The installer should have checked the temperature rise and gas pressure. By adjusting the gas pressure and blower speed you can obtain a higher outlet temp, but you don't want the gas pressure to be higher than the manufacture specs and you don't want the furnace to run outside of the manufactures temp rise specs.

Mar 02, 2017 | Gibson Heating & Cooling

1 Answer

Gas furnace short cycles 2 minutes or less. Multiple troubleshoot steps and replaced components - no help. Any advice?


I did not see that your indoor fan motor started. Near your indoor fan motor there is a temperature switch that is called the fan delay relay. On a temperature rise the relay shuts a contact that turns on the indoor fan motor. If the contact does not close the high temperature limit will shut the gas controls off like your getting. A fan delay relay also allows the fan to run a minute or so to carry away the remaining heat in the furnace and help cool the furnace down. The fan delay relay is normally mounted in a recessed area in the fire wall of the furnace plate. I have also seen them on the top of the furnace heat exchanger. Anyway, the fan delay relay will probably not be available on a sunday, so temporarily until parts are available, try turning the thermostat fan from auto to on and try the furnace again. By turning on the fan to on the high temp limit will not shut you down again.

I have had high temp limit change there trip points, but you said you bypassed it and did the same thing.

Another cause could be using the wrong type of air filter. The new pleated filters sold block to much air flow. If air mass flow rate drops the difference in temperatur go up and when the difference in temperature go up, it gets nearer the high limit and causes it to trip. All pleated filters drop normal air flow through ducts by at least 35%. To make your air duct system work properly use the what is called throw away filters which cost about 1/3 the cost of the pleated filter. Remember to either clean or change the throw away filter monthly to reduce dirt being drawn into your duct system.
Hope this helps.

Feb 13, 2015 | Heating & Cooling

3 Answers

Trouble shoot Dayton gas furnace model GG9S100C16MP11A fan is left on constant but in cold weather 10 or colder fan will go off and furnace will go thru a restart mode and run fine for awhile then will do...


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.

Feb 03, 2015 | Dayton Gas Furnace Heater

1 Answer

Gas furnace doesnt turn on right away after going below temperature setting. set at 70 and houes temp went down to 67 for an hour until furnace kicked back on. just replaced old thermostat because it was...


If it is a digital thermostat you must follow the set up instructions once you install the wires. Some are multi device,, which means they can be used for oil burners, electric furnaces , and gas furnaces. They have cycle programs that are different. The book will tell you which set up code to use for the type of furnace you have. If it was doing it before, it could be the primary control on the furnace itself (usually a honeywell ),,a sticking relay etc.. you need to have a technician take a look at it.

Jan 23, 2015 | Heating & Cooling

1 Answer

I have a Honeywell programmable thermostat and I have central heat and air system. When I set the heat to a temperature above the inside temperature, the heater turns on for a short period of time and then...


I would say that the problem is in the furnace, not the thermostat. The Thermocouple or other temp sensor needs replacing, the sensor that tells the furnace that it is heating. It just keeps turning off and trying again in 3 minutes cycles.

Jan 01, 2015 | Heating & Cooling

1 Answer

Fasdfas


Does the furnace stays off?.
Furnace are ment to cycle on and off because of limits .If you set to 70 furnace would cycle several times before reaching that temperature.
Just make sure your filters are clean and you got proper return air flow because lack of air flow will cause furnace to shut off sooner than normal

Jun 08, 2017 | Heating & Cooling

2 Answers

Ruud 90+ Model UGRA 10EZAJS Trips Out


Check for condensation buildup in the Induction Blower housing. The condensate tubes or canister may be blocked and causing the diaphragm switch to trip the unit out causing the burners to shut down.

Feb 11, 2012 | Ruud Heating & Cooling

1 Answer

Goodman Furnace flame still burns at the rod when heat cycle done


Your gas valve is leaking and must be replaced. They are not serviceable. When it is replaced the gas pressure should be adjusted with the use of a manometer. The turbulence may be caused by the gas valve or the burner may be dirty. If the burners are dirty the should be removed and blown out or rinsed out - if you rinse them be sure to shake all the water out!

Please rate my answer!

Mar 25, 2009 | Dayton Gas Furnace Heater

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