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Electric furnace will not shut off

Woke up this evening house is at 75 degrees shouldn't be above 65 notice furnace was running turned thermostat all the way down no change the air is warm coming out so the elements are working but not shutting off at do I need to checkwh

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Let me know the model number

Posted on Nov 18, 2014

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1 Answer

My furnace runs to operating temp on thermostat shuts down then within 30 seconds try's to cycle back on three to four times. What would cause this.


Some thermostats have a swing setting that can be adjusted. A swing is the setting when you want the furnace to stop or start from the desired set point. For example, you set your thermostat at 70 and the swing is set at 10 degrees. Then the furnace will turn on 5 degrees below 70 and shut off 5 degrees above 70. Check you thermostats manual if it has this option.

Mar 15, 2016 | Heating & Cooling

1 Answer

WHY DOES MY FURNACE SHUT OFF BEFORE REACHING TEMP


Hi Demetrio
Furnaces turn on and off based on what they're told by your thermostat. The thermostat, in turn, will control the furnace based on:
  1. The temperature AT the thermostat.
  2. What the internal heat sensor thinks the temperature of the air is.
So, if your idea of 68 degrees is what the thermostat thinks is 71 degrees (thermostat reads three degrees high), then when the air by the thermostat gets to about 65 degrees (by your account), it'll think it's 68 degrees and shut the furnace off.

Also, if the thermostat is, say, near a source of local heat, like a lamp, a big piece of electronics, a fireplace, or that place that you habitually set down your coffee, then the air right next to the thermostat may be warmer than the rest of the room, and fool it into thinking it's at it's target.

The sensor is usually inside the housing for the thermostat. If it hasn't been dusted in a while, then it can be hard for air to get inside to affect the sensor, though this would generally cause it to lag on readouts and run the temperature higher than you wanted.

If you have a digital readout, and the system is saying , hey, target is 68, and the readout gets to 66 and the system cuts off the furnace.... my only other guess is that the unit may have features that are trying to prevent overshoot - i.e. by the time the temp at the thermostat actually gets to 68, most of the room is more like 73. That'd depend on your particular thermostat. At that point, you may want to call customer service with the manufacturer and tell them the issue. There may be ways to adjust the unit to get behavior closer to what you seek.

Good Luck!

DH

Jan 25, 2016 | Heating & Cooling

1 Answer

I have a Braeburn 3200 and when the the temperature reaches the desired heat setting. The furnaces heat will shut off, but the fan will continue to run indefinetly. eventually blowing very cold air up


The fan relay is stuck in the on position. When the temperature drops the heater does not ignite because the fan is already running and ignition is locked out after the heat cycle starts an the fan turns on

Nov 16, 2014 | Heating & Cooling

1 Answer

Robertshaw thermostat will not shut off heat


gas or electric furnace? sounds like bad sticking t-stat but could be sequencer or gas valve. The fan will continue to run if the unit is hot safety feature so the fact that the fan continues to run does not mean the t-stat is diffidently bad.

Mar 01, 2012 | Heating & Cooling

1 Answer

I just installed a honeywell 5-2 progammable thermostate.. Everything is hooked up fine and I have my days, hours wake, sleep, leave...etc all set, but when it goes on.. for example, I have it set for...


You didn't include a model number, so it's hard to know for sure - but I'll take a stab at this one. Many of these t-stats have a programmable offset to reduce "hunting". This can be as little as 1 degree or more than 2 degrees.

This means if you set the offset to 1 degree and the room temperature to about 65 degrees, the furnace will heat the room until the t-stat registers a rising temperature of 66 degrees. The furnace shuts off and will not turn on again until the t-stat registers a falling temperature of 64 degrees. The average is 65 degrees, and prevents the furnace from starting and stopping numerous times instead of just once with the 1 degree offset.

You can further reduce the number of furnace start and stops by increasing the offset to 2 degrees. This would work like this when the t-stat is set to 65 degrees and the room is cool:

Room Temp Furnace
63 On
64 On
65 On
66 On
67 On
68 Off

The room is now warm and heat or furnace is off. The room begins to cool like below:

67 Off
66 Off
65 Off
64 Off
63 Off
62 On

With a 1 degree offset, the room temperature varies +/-1 degree (about 2 degrees total). With a 2 degree offset, the temperature about varies +/ -2 degrees (about 4 degrees total).

Also, when the thermostat shut the heat off, the heat that was made is delivered to the space instead of wasted by sending outdoors - so the room will get a little warmer even though no fuel is being burned. The same holds true at the other end. When the t-stat turn heat on, fuel is burned, but there's little heat until the source has reached the optimum temperature and then the heat is delivered to the space.

I hope this helps & good luck! Pleas rate my reply - thanks!

Jan 24, 2011 | Honeywell Programmable Thermostat Heater

1 Answer

I have a Lennox heat pump, approximately 15 years old. This morning I woke up and noticed that the house was cold. I attempted to raise the temperature but nothing happened - the heat didn't kick on and...


Hello,
Something inside of the unit caused a direct short between the unit and that fuse box/panel. Usually a short that causes this much "fuss" is a dead compressor (worst case scenario). If there are no lights on at the thermostat then most likely the breaker for the furnace has tripped as well. There are 2 seperate circuits- one for the air conditioner and one for the furnace, they both tie back into the main electrical panel inside the house- wherever that is.
Hope this helps, James

Jan 05, 2011 | Heating & Cooling

1 Answer

Installed this thermostat a year ago and was working fine, Noticed the heat wasn't kicking on like usual, the thermostat is set for 75 and the temperature in the house is continuing to drop in the 60's. I...


I want you to try this simple way of trouble shooting the thermostat. Remove it from it's mounting and you need to locate the wiring for it, now the red and white run your furnace. If you join the two wires together your furnace should run, this makes it run with out a thermostat so it never shuts down.Now what you learn is if it runs it is a bad thermostat, if it does not run it is in the furnace control. Can be a stuck relay or bad board in the furnace, this is the easiest way to check the thermostat that I know of.

Dec 27, 2010 | Honeywell Heating & Cooling

1 Answer

Day / Night HVAC is running cool air BUT the furnace is running 2


Strange. Does the thermostat control both the air conditioning units and the furnace. If not make sure the furnace thermostat is turned down to below 65 degrees.

Jun 29, 2009 | Honeywell Programmable Thermostat Heater

4 Answers

Thermostat seems to be working, furnace does not always turn on


Joss sounds like the anticipator setting on thermostat i would replace it with a digital it will be more actturat . The furnace has to go over temp setting to turn off

Jan 15, 2009 | Honeywell Electronic Programmable...

2 Answers

GMC FURNACE MODEL GMPN060-3


Sounds like s safety or overheat switch is tripping. Clean or replace air filter, inspect the venting for restrictions and make sure all registers are open all the way and not blocked by furnatue. Also check the condensate to make sure it is draining. If it continues to not heat, call a technician.

Jan 22, 2008 | Heating & Cooling

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