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Room temp is not where it should be before furnace shuts down

I have a Fridgidaire furnace, energy efficient, just installed, everything works but the room won't get up to temp before shutting down. It then does a purge cycle then after about five minutes the furnace turns back on blowing hot air

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Did the installer check the amperage at your thermostat and then adjust the heat anticipator? Or you may need to have the blower time settings changed to suite your needs. Get them back in to check.

Posted on Nov 11, 2008

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Posted on Jan 02, 2017

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Pilot and burner light then gas shut off model 7900


How many degrees before it reaches desired temp, does it shut off? A thermostat is designed to shut the furnace off a couple/ few degrees before it reaches set temp. It has what is called a heat anticipater, which shuts the burner down, and lets the blower use the remaining heat from the heat exchanger to bring it up to desired temp making it more efficient. If it is more than a few degrees, replace the thermostat. You can jump out the red and white wires to confirm the faulty thermostat. If by doing this, the furnace never shuts down, until you separate the red and white wires. That confirms a faulty thermostat. Hope this helps someone.

Oct 06, 2014 | Coleman Propane Forced Air Heater...

Tip

2 Stage Furnaces More Comfort and Save Money


Two stage hot air furnaces can save you money and make your high efficiency furnace even better. With your furnace running at low fire instead of cranking up to the highest heating output in mild weather you can be more comfortable while saving money.

Many people think that they are getting the best they can get by buying a high efficiency single stage furnace. What they often don’t realize is that they could do better yet and for a few dollars more have a high efficiency 2 stage furnace that could keep them much more comfortable.


There are 2 stage hot air furnaces that are now available that will only run at half fire if the full fire is not needed. With a two stage furnace in mild weather when only a little bit of heat is needed, the furnace will have longer run times on low fire. This will keep you room temperatures from getting too hot before the thermostat reacts and shuts the furnace off again. This will help to keep your temperatures from overshooting the set point and help to keep your home much more comfortable.

Many of these two stage furnaces also have variable speed blowers that run at a lower speed when heating on low fire. This will also help to save money on your electric bill, because these blowers use very little electric when running at these low speeds. Air noise from the blower running at a high speed is also reduced.

If you are thinking of replacing or installing a hot air furnace, make sure that you ask your contractor to give you a price on installing a two stage furnace. The price difference probably will not be much higher than a high efficiency single stage furnace. However the comfort of the two stage furnace coupled with the electric savings will make the extra money well worth it.

on Dec 14, 2009 | Heating & Cooling

1 Answer

What size oil furnace is needed for 1200 square feet?


75000 to 85000 btu Or British thermal pound.
Two units of measure are important in sizing an oil furnace. The first is the British Thermal Unit or BTU, which represents the energy needed to raise the temperature of one pound of water by one degree Fahrenheit at normal atmospheric pressure. The input capacity of an oil furnace is often stated using this unit of measure. The second number is the fuel efficiency rating, which is expressed as a percentage. This represents the amount of energy that gets converted to heat, with higher numbers being better. To determine the energy output in BTUs per hour, multiply the input BTU by the efficiency rating. For example, a furnace with 100,000 BTU of input and an efficiency rating of 89 produces 89,000 BTUs of output. One with an efficiency rating of 80 and the same input amount, produces only 80,000 BTUs of output.

Read more: http://www.ehow.com/info_12197488_size-oil-furnace-required-1200-square-foot-house.html#ixzz2jfsuqLFx

Oct 25, 2013 | Heating & Cooling

1 Answer

Furnace will kick on, begin heat up, go to the point where the fan should start and the whole thing shut down. If I move the thermostat down below the temp it show, it will start again and do the same...


Hi,

Sounds like the blower motor is bad and then the unit is kicking off on high limit....

Probably nothing you can do with out getting a new motor to replace the bad one...

heatman101

Feb 02, 2011 | Dayton Gas Furnace Heater

1 Answer

Starting this afternoon: Thermastat was set (Manual) to turn on at 68, display window showed 63 but the furnace was not running. I manually set the turn on temp below 63, then up to 67 and the systrm...


Definitely a thermostat.It has 2 sections.One is a temperature reference section(what temp you want).The other is the temp reading section.If either one is bad,it will do just like you said.Sounds like the reference section is probably bad because it comes on for a couple minutes then shuts down.Since it was fine earlier in the day,I doubt there is anything wrong with the furnace because as you can see,it is temperature related.A furnace problem would be more of no operation at all,even if just dirty or whatever.The thermostat also would be a more common 'fail component' than the board.A suggestion also,both for a car and a house.During the summer,run the heat for 2-3 minutes,just to cycle it occasionally.In winter,run the A/C for 2-3 minutes.Do both perhaps once or twice a month.It helps keep the components,somewhat fresh I guess you would say,because cycling it occasionally helps to keep it going good.Also,if you encounter a problem,you may be able to get it fixed before you really need it.In the meantime,feel free to come on down to FL until it's fixed,we have room,lol.Although it's chilly now,the weekend will be 70's.(sorry)Good luck,Greg

Dec 08, 2010 | Coleman Heating & Cooling

1 Answer

The digitel display show room temperature in the 70's when room is very cold, thus it does not turn on when you want it to


The temp you are looking at is a error code. 72..76 is the code for room sensor. 76..80 Room sensor shorted.

Tom

Sep 30, 2010 | Rinnai RHFE-431FAIII 16,700 BTU Direct...

2 Answers

Do rinnai heaters run efficiently if turned up and down often?


Maintaining the lowest acceptable setting and leaving it at that temperature is the most economical way to run the unit. If the space is going to be unoccupied for an extended time (several hours), lower temperatures are okay. This minimizes the need to burst the heat to warm the space quicker. As I understand your unit, it minimizes electrical & gas consumption by basing the need on the temperature difference of actual space temperature and setpoint. The larger the gap, the more power and gas is consumed.
In summary, when the space is occupied, maintain a consistent temperature setting. When the space is unoccupied, maintain a lower setpoint.

Hope this helps. Good Luck. :-)

Feb 15, 2010 | Rinnai RHFE-1004FA 38,400 BTU Energy Saver...

1 Answer

Rinaai LP space heater will not shut off when set temp is reached


Test the thermistor by using an ice cube. Place the cube on the thermistor and see if the unit starts. Then using a warm towel, wrap the thermistor ans see if it stops. Watch the display to see if it is registering the changes in temp. I suspect a bad thermistor.

Jan 02, 2009 | Rinnai RHFE-1004FA 38,400 BTU Energy Saver...

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