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Furnace repair My furnace will only get the heat up to a certain temp. To get it to go higher I have to turn it off and on several times. The thermostat and motherboard have been replaced., What do you think it

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If the thermostat is an older model it may have the heat anticipator on the thermostat set incorrectly. It should be set to the measured amp draw from the "W" terminal on the thermostat.

Posted on Apr 30, 2017

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Posted on Jan 02, 2017

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Goodman furnace fan cylcing


The fan switch is set to turn on at approximately 125 degrees and run until the heat exchanger temp drops to around 105 degrees. With age the sensitivity of this switch varies and summer heat can cause the switch to turn on if the outside temp is over 100 degrees. Only the fan is running, not the burner but you can shut off the power to the unit if this is an issue.

Aug 27, 2012 | Heating & Cooling

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Why does my home heating system comes on then off after five mins


Likely the cause is the plenum switch. The switch is temperature actuated, so the fan does not turn on until the temp rises enough.....so, after shutdown the furnace temp "heat soaks" and the fan will come on and off, sometimes several times, and this is normal.....

Feb 27, 2012 | Heating & Cooling

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The furnace comes on just briefly then goes off, after a time it will come back on and stay on. Is this normal?


Yes, depending on exactly what you mean by furnace on. Many furnace fans react only when plenum temprature reaches a certain amount.... (helps keep from blowing cold air) The circulation fan can run several times after burner shoutdown, based on the temp....

Mar 01, 2011 | Honeywell Heating & Cooling

1 Answer

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...


Well, here is the deal: unless you rewired from two wire to multiple (usually 4 to 10 wires) wires, the fan cannot be controlled from the thermostat, even though the thermostat indicates that it can > it is a physical wiring and fan administration issue.

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.

Oct 03, 2010 | Honeywell Electronic Programmable...

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If i am away for any length of time, do i put the temp on vacation? does the water still get warm?


Since you didn't provide the brand & model of the thermostat, only generic help can be provided.

Most furnaces that run on oil or gas, make hot water all the time, 24 / 7 - winter, summer and everything between so to speak. They are controlled by an aquastat that may be set for any value between 140 - 180 degrees F. This is called "hot start" - simply because when the thermostat is set to a temperature higher than the room (turning heat ON), the water is already hot in the furnace, and is circulated immediately. If it was a "cold start", you'd have to wait for the water in the furnace to heat up from room temperature. This would substantially increase the amount of time it would take to heat the room.

Generally, the "vacation mode" simply halts the program from running. If your thermostat changes temperatures several times during the day / night, it will simply hold the lowest temperature - or a predetermined temperature built in - or chosen by you. You'll need to consult your manual to determine just how your thermostat handles the vacation mode setting. Post again if you can't find the manual - but tell us what brand and model it is.

I hop ethis helps - good luck!

Many heating thermostats don't allow for setting a temperature below 45 degrees F so freeze ups shouldn't be a problem.

Sep 30, 2010 | Heating & Cooling

1 Answer

When turning on heat after a period of using air


It sounds like the fan limiter switch is going bad. This switch waits until the air temp is high enough for heating the house before allowing the fan/blower to come on. There is another switch that shuts off the blower when the air drops to a certain temp, or it may be the same switch that does both jobs. Hope this helps.

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1 Answer

Carrier Furnace infinity 96.model 58MVP060-F-18114. Furnace heats


Sounds like it could be your fan limit switch. Part costs about 20 bucks and is fairly simple to replace. This limit switch is a safety that prevents your furnace from over heating. Usually when your t/s is satisfied the blower runs for a little longer after the burners have stopped, and the reason for that is the limit switch. The blower is supposed to cool this limit switch to a certain temp. and once it reaches this temp it shuts the blower off. Yours is stuck:(

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1 Answer

Open limit switch


Tjere is a limit switch that will only allow the durnace to reach a certain temp by kicking on the fan. The thermostat being unable to read the temp affects its ability to keep the furnace from exceeding your settings. *Advise not to use until corrected. Both limit switch and thermostats are inexpensive and simple to change. If in doubt, call a heat and AC tech to repair.

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Heat temperature issues with Goodman GMP 100-4 furnace


69,000 btuh is adequate for a 12-1400 square foot house.
Otherwise, your thermostat simply tells the furnace to cycle on/off.
If it calls for heat and does not come on, the problem is with switches and relays within the furnace.
Your setting the temp higher only causes the other parts to keep trying until they finally light and heat.
This is based on your information saying it will cycle on and blow cool air--not hot air.
You will have several temperature variations from floor to ceiling.
You probably have ceiling vents as well.
You need a technician to verify the rollout switches, fan relay, inducer fan etc. if the furnace is not firing everytime you call for heat.

Feb 21, 2009 | Goodman CPLE24-1 Air Conditioner

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