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Electric furnace/heater pump/fan unit won't shut off

Even after preset temp is reached, with thermostat set to "emergency/aux heat", electric furnace/heater pump/fan unit won't shut off unless manually shut. The unit is less than 5 year old and is a TRANE.

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There are dip switches on the main board.. When you remove the lower panel on the air handler there are instructions to where the dip switches should be for your units fan control. if the switches are in the correct configuration.. The Thermostat may be malfunctioning or not wired properly. and last.. and most expensive.. the motherboard may also be failing.

Posted on Jan 12, 2009

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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.

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Even though the outside temp is above 35 degrees my unit still runs as if it is on emergency heat because the outside fan does not come on and the house is really hot!


SOunds like we have some control problems--
First explain what you mean by 'Emergency Heat'-- (That is a new expression to me..)

And what is the 'Outside Fan' yo are speaking about?

And for basics-- are we talking about and electric heater-- a Gas heater, or what?

Is this a furnace-- or a wall or window unit-- Tell us more-- and we'll get to the next steps..

I am wondering why the house is so HOT-- Where is the thermostat?

Mack B

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My honeywell Thermostat reaches the heating temp. but the fan will not stop running.And yes the fan is set to auto.It just keeps running and running and running.It stays the same temp but will not shut off...


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With my thermostat on auto and on heat, and the furnace turns on, the fan will not turn on with it. If I switch the fan to on it will run after I repeat back and forth from auto to fan on several times...


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Unless you have a newer furnace, the fan is controlled by plenum temp. Works like this: burner turns on, no fan until the plenum temp reaches set temp,....then burner off, and fan keeps running until pelnum temp drops, and often the fan may kick on a few more times as this temp depletes.

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Rheem RHQA Heater:Blower works but no heat.


Is there a setting on the thermostat for Auto or Fan? If so, make sure it is in the Auto setting. You will have a contactor that turns on the elements and a relay for the fan. Follow the wiring diagram to see which relay energizes the fan then unplug it to see if the fan stops.

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There are a few reasons why your furnace is restarting after it reaches temp. and shuts off. First, if you have a mercury bulb thermostat it needs to be level and the heat anticipator needs set properly. If you have an electronic thermostat then you need to make sure the DIP switch settings inside are set properly for propane. If you have a digital thermostat there are also settings to be made for your type of heating. These settings will be explained in the thermostat installation instructions. Also, Make sure your furnace filter is clean. If this does not help then there are some other things to check which may need to be done by a technician depending on your mechanical aptitude. Hope this helps!

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3 Answers

Won't shut off when reaching preset temp


Sounds like a thermostat problem or a short in the wire. Can you give us more info like is it gas or electric and model numbers will help.

 

Thanks.

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