20 Most Recent Dayton Gas Furnace Heater Questions & Answers

Hello I'm having a similar issue with my furnace. Same model. 4 lights are flickering. Filter has been replaced, there's proper air flow. Blows out cold air. This has been occuring every year for 3 years. Techs have told me there's nothing wrong with it and showed me where the limit switches are and how to fix it. It's happened again tonight and everything they showed me is not working. Not sure what to do except call a service tech. Any help? York GF8100C16MU11A

Dayton Gas... | Answered on Nov 01, 2019

The High temperature limit controls how much heat your furnace will deliver. The higher the temperature the hotter the air it delivers. At the same time, the higher the temperature, the hotter the exhaust that is wasted energy. The amount of heat you need relates to outside temperature. Some more sophisticated controls would adjust the high limit to change with outside temperature However, with a fixed limit, the lower the limit the more efficient your operation. If you are looking for maximum efficiency, then you should lower the limit to the point where the fan runs continuously on a cold day. If the fan shuts down, it means that you are making more heat in the furnace than you need. You might want to change the high limit
to be higher in the colder part of the winter when you need maximum heat, and then lower it when the outside temperature worms up.
If you are getting adequate heat at 150 Deg. you should not go higher, because the higher the limit, the lower the efficiency and the greater the stress on the furnace.

Dayton Gas... | Answered on Mar 02, 2019

Check the high and low snap disk and check wall thermostat if fitted.

Dayton Gas... | Answered on Jan 05, 2018

Well you have to buy reducer to get it down to 2 inches. Are you sure it's 2 inches or 3 .
Maybe this is a high efficiency heater so design to use a 2 inches pvc pipe

Dayton Gas... | Answered on Dec 19, 2017


The only way considered safe to connect copper and aluminum is through a splice connector. Specifically, you have to connect the wires individually so they are not prone to corrosion.

Semper Fi,

Dayton Gas... | Answered on Apr 30, 2017

Try national energy they are on line and carry most spares

Dayton Gas... | Answered on Apr 06, 2017

Get the pilot light sensor replaced as the burn down with use and if they are just out of spec the sensor cools and shuts off the gas flow for safety

Dayton Gas... | Answered on Dec 05, 2015

In my experience a 20 year old Magic Chef probably has a bad heat exchanger which can cause carbon monoxide poisoning and can not be replaced since Magic Chef is not around any more!
Today’s furnaces are controlled by a computer which constantly monitors for problems. When it detects a problem it will shut off the burners. Depending on the problem and the specific furnace it will either “lock out” the furnace or cycle it through a purge (to rid it of un-burned gas and excess heat) and then attempt to re-start it. If the problem continues to occur then it will “lock out”. Depending on the problem and the furnace it may again attempt a re-start after several hours. In any case if the problem was not detected/caused by a sensor which requires a manual re-set, when the power to the computer is interrupted or the call for heat is interrupted the computer is reset and it will again attempt to re-start the furnace. The most common problems are:
· Low or lack of flame sense. Different furnaces use different methods to detect a flame – often these “flame sensors” become dirty and have to be cleaned (usually with sandpaper or steel wool).
· Bad igniter. (Doesn’t light at all).
· Clogged combustion air intake or exhaust.
· Clogged condensate drain. (90+% efficient furnaces).
This is not a complete list, only the most common!
Depending on where you live your HVAC system runs more than anything else you own (including your car). All furnace manufacturers “recommend” “regular maintenance” of your furnace. In fact, all that I am aware of state in their warranty that the warranty may be voided due to lack of “regular maintenance.” The industry has defined “regular maintenance” as yearly (in fact, some manufacturer’s warranties state yearly). Due to safety, liability, and the need for many other things to be checked, cleaned, and/or adjusted (2-page checklist where I work) to ensure safety and efficiency. Due to the large number of furnaces and the differences between them. Moreover, due to the terms of this site, I WILL NOT AND CAN NOT give you specific instructions on how to perform repairs on your furnace. I suggest that you contact a local, reputable, HVAC service company for (a tune up, preventive maintenance, general maintenance, yearly service call, general service, or whatever they call it).

While I may not have told you how to fix your furnace yourself, I have told you how to fix it. Please rate my answer.

Dayton Gas... | Answered on May 04, 2015

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