Question about Heating & Cooling

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Gmp075-3 Thermostat is not calling for heat. Blower starts then vent blower starts and runs for about a minute then shuts off. shortly after that blower shuts off. If the thermostat is calling for heat it runs till thermostat is satisfied. Then maybe an hour later it starts sequencing again.

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  • general986 Sep 30, 2009

    Goodman furnace model gmp75-03 s/n 9504042051. If the thermostat calls for heat it operates as you descibed. It is when the thermostat is not calling for heat that it starts the wierd cycle.

  • general986 Sep 30, 2009

    I am looking for what would cause the problem not buy another furnace. goodman gmp075-3 furnace . Standard start up procedure is .1 blower motor starts. 2. vent motor starts 3. hot surface ignitor activates. 4. gas turns on.

    If the thermostat completes the the circuit the furnace operates correctly. When thermostat is in open circuit . The furnace will start sequence 1 then 2 then vent motor stops and blower motor stops. This sequence starts at random cycles.

  • general986 Sep 30, 2009

    The furnace runs perfectly when the thermostat is calling for heat. It is when the thermostat is not calling for heat that it does the wierd cycle.

  • general986 Sep 30, 2009

    It had a flash 2 code once which was pressure switch problem. But I then turned thermostat on to call for heat. It flashed heat the furnace came on and brought the temperature in the house up. I have pulled the thermostat off the and disconnected it. And the furnace started doing the wierd cycle.

  • general986 Sep 30, 2009

    Thermo stat is not relevant it is unplugged laying on the counter. I turned electric supply to furnace of the turned it back on. The furnace then started the wierd cycle a few minutes latter.

  • general986 Sep 30, 2009

    If it was shorting out why wood it work when the thermostat called for heat?

  • general986 Sep 30, 2009

    I tried that earlier but might not have gotten it all. If It was dust would it be affected by heat . I had the electricity shut off for 24 hours. When I turrned it back on It was 3 or 4 hours before it started acting up. Now it acts up within 10 minutes.

  • general986 Sep 30, 2009

    What I ment by heat buildup. Would be the heat generated by the transformers and other electical current drawing devices on the control board. I did not fire the furnace up till after it acted up after the electric was turned back on after being off for 24 hours.

  • general986 Sep 30, 2009

    The blower comes on before the fire box is lit. It does not light till after the blower and inducer are running.

  • general986 Sep 30, 2009

    The power is hard wired into a electrical light switch as it has been for 10 plus years. Can you think of any other possibilities other than the control board. Which is the only thing I can come up with.

  • general986 Sep 30, 2009

    On this unit it has two limit switches. It has a high temp limit switch. Then it has a sail switch to verify blower is operating. So both switches have to be closed before the heat cycle will start. That is why the blower comes on first then the inducer. Once the inducer activates the pressure switch then the ignitor starts. Then the gas turns on.

  • general986 Sep 30, 2009

    When I was just reading the start sequence it said that the blower and inducer come on and the indicator light would flash 4 times if one of the limits were open.Which there are no flashes. when I wash down the board and dry it. If it still acts up any other thoughts

  • general986 Sep 30, 2009

    The auxiliry limit is the sail switch that is closed by the blower motor when it is blowing air. and hooked in series with the high temperature switch. So both have to be closed to complete the circuit. If the blower motor is not running in this high iffeciency furnace it would probably burn through firebox before high limit tripped.

  • general986 Sep 30, 2009

    I will try that Thank you for your help

  • general986 Sep 30, 2009

    Number 2 helped me go through process of elimination.

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Is the heater working at all? When you say blower starts then the vent blower starts do you mean the inducer motor for the vent on the furnace? So is the the heater sometimes working and then sometimes not or not getting burner flame at all? It could be the furnace malfunctioning and not the thermostat. Let me know more info and I can assist you further.

Posted on Sep 30, 2009

  • 10 more comments 
  • muebe Sep 30, 2009

    Ok I was able to see your other comments now. When the furnace times out and does not come on is the control flashing a code and what code is it? There should be a sticker somewhere on the unit that shows what the codes mean. It might flash three times then paues and three times again...that would be code 33 for example. Does the thermostat have a "heat on" display and does it flash when the furnace is malfunctioning?

  • muebe Sep 30, 2009

    And what kind of thermostat is installed? Does it run on batteries or on the 24volt system for the furnace? If it has batteries remove them...if it shuts off after a few minutes it is strictly batteries if it stays on the it is 24volt and batteries are for back-up in case of power outage.

  • muebe Sep 30, 2009

    So the furnace is doing the weird cycle when the thermostat has been removed from the wall...Are there any loose wires behind the thermostat housing or at the screws where the wires are installed in the thermostat housing? Sounds like something is shorting out.

  • muebe Sep 30, 2009

    Try blowing the control board off with compressed air...It is possible that there is dust on the board causing a short. Dust can be conductive. Also look for any loose wires and check the connections on the board and sensors for any that are loose.

  • muebe Sep 30, 2009

    Well if it is a problem that is not happening all the time then there is something triggering the fan and inducer motor to come on. If it was doing it only after you run the heater I might say that it is because the heat build up in the firebox and venting system may cause the unit to run the blower and inducer motor to help cool the firebox down. But you are saying it just does it at all the time at different times. Thats why I would think something is shorting out...or the control board is malfunctioning.

  • muebe Sep 30, 2009

    There is a tempature sensor located inside the firebox that will turn on the blower motor once it reaches a certain tempature. This sensor runs independent of everything else and it can turn the fan on when it picks up heat in the firebox. Now if this sensor is malfunctioning it could cause the blower motor and possibly inducer motor to come on and shut off. The problem is the control board is like a mini computer and can cause things like that to happen when they malfunction. I have had problems with electrical components shorting from dust that is why I mentioned it.

  • muebe Sep 30, 2009

    And another thing I just thought of is to check the electrical outlet that the furnace is plugged into and check that the ground is good and also that the plug does not have reversed polarity.

  • muebe Sep 30, 2009

    Normally the blower does not come on untill the firebox has warmed up to a pre-determined tempature. The inducer motor has to come on first before the igniter will come on.

  • muebe Sep 30, 2009

    I am leaning toward the control board...I would cut the power to the unit and then just mist the board with rubbing alchohol and then blow it off really good with compressed air. I am really serious about the dust problem. I had a computer that someone brought me to fix because he took it to the shop and they told him the board was bad. I took out the motherboard and put rubbing alchohol on it and blew it off and it worked perfectly afterword. It was the dust causing the problem. And your control board is a small computer.

  • muebe Sep 30, 2009

    The high temp limit switch will only be open if the firebox gets too hot and reaches the preset limit and inducer motor has a vacuum switch hooked to it that closes when the incucer motor creates positive or negative pressure. The furnace does not need the blower motor to come on to start ignition just the inducer motor vacuum switch. The fan switch might be wired in with the heat demand wires causing the blower motor to come on when the thermostat closes the circuit.

  • muebe Sep 30, 2009

    Double check for loose wires or any exposed wires. Otherwise I am still leaning toward the control board. Everything is controlled or checked by the control board. A malfunctioning board can cause the problem you are having.

  • muebe Sep 30, 2009

    Ok well your furnace is not a common setup. I deal with a lot of funaces and even the catagory 3 units do not start the blower motor right away...But I trust you. So your furnace is a catagory 3 with a PVC venting system and pulls combustion air from the roof. Also has a secondary condensation line for the moisture created by increased reduction of heat in the firebox...And probably 92% to 96% efficient:)

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The thermostat does not call for heat. It is a switch that tells the furnace to start, the exhaust fan should then start and then the ignitor should fire and the gas valve should open. After reaching the right temp then the fan in the bottom of the furnace should start and hot air should flow. If the exhaust fan comes on the thermostat is working and the problem is either the flame sensor or the ignitor. If you are not satisfied with this please post the make and model of the furnace.

Posted on Sep 30, 2009

  • Brad Brown Sep 30, 2009

    All the parts for that unit are right here:

    http://www.myhvacparts.com/Goodman%20Par...



    The circuit controller boards are at the bottom. I would see about replacing that. However due to the age of the unit, it might be better to get a new furnace. You will save in efficiency.

  • kdgrayson747
    kdgrayson747 Jan 13, 2013

    I am sorry but in 37 years of the trade , Thermostats do in fact "CALL" for heat, They do not have a cell phone or land line or Skype as you have noted, However when the switch between Red and White closes it does call for heat, if not what does then?

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Dryer starts and about 5 minutes later stops and lights start flashing


DRYER OVERHEATING: Heating Element
A defective heating element can make a dryer too hot. If the element partially shorts out, it can produce heat all the time, regardless of whether the dryer is calling for heat. Remove the heating element to inspect it. The coils should not be touching each other or anything else.

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Felt Seal
Most dryers have a felt seal at the front and rear of the drum to keep the heat inside the drum. If the felt seal is worn away or missing, the dryer may keep heating and make the dryer too hot. This is not common.

Blower Wheel
A defective blower wheel will not spin properly and will not vent the hot air, making the dryer too hot. Check to see if there is adequate airflow out of the dryer.

Dryer runs then shuts down wont start up for an hour:
Bad motor windings


https://www.youtube.com/watch?v=3m5NZvY9V5Q

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Speed queen dryer agm4199w heats up and shuts of


DRYER OVERHEATING:

Heating Element
A defective heating element can make a dryer too hot. If the element partially shorts out, it can produce heat all the time, regardless of whether the dryer is calling for heat. Remove the heating element to inspect it. The coils should not be touching each other or anything else.

Other Causes and Conditions
Air Flow Problem
Dryers need good ventilation to work properly. If the vent is clogged it can make the dryer too hot. Clean all of the vent tubing thoroughly.

Cycling Thermostat
Although not common, a defective cycling thermostat can make the dryer too hot. The cycling thermostat is supposed to turn on and off the heat to maintain the proper temperature. If the thermostat is defective it may keep the heat on too long. The thermostat is not adjustable or repairable, it must be replaced.

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Most dryers have a felt seal at the front and rear of the drum to keep the heat inside the drum. If the felt seal is worn away or missing, the dryer may keep heating and make the dryer too hot. This is not common.

Blower Wheel
A defective blower wheel will not spin properly and will not vent the hot air, making the dryer too hot. Check to see if there is adequate airflow out of the dryer.
https://www.youtube.com/watch?v=3m5NZvY9V5Q
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Dryer will run about 10 minutes then shut off. Try to turn it back on and it just will buzz


Either a motor with bad windings,. or an over heating problem?
Dryer runs then shuts down wont start up for an hour:
Bad motor windings
GOD IS GOOD !!!!
DRYER OVERHEATING:

Heating Element
A defective heating element can make a dryer too hot. If the element partially shorts out, it can produce heat all the time, regardless of whether the dryer is calling for heat. Remove the heating element to inspect it. The coils should not be touching each other or anything else.

Other Causes and Conditions
Air Flow Problem
Dryers need good ventilation to work properly. If the vent is clogged it can make the dryer too hot. Clean all of the vent tubing thoroughly.

Cycling Thermostat
Although not common, a defective cycling thermostat can make the dryer too hot. The cycling thermostat is supposed to turn on and off the heat to maintain the proper temperature. If the thermostat is defective it may keep the heat on too long. The thermostat is not adjustable or repairable, it must be replaced.

Felt Seal
Most dryers have a felt seal at the front and rear of the drum to keep the heat inside the drum. If the felt seal is worn away or missing, the dryer may keep heating and make the dryer too hot. This is not common.

Blower Wheel
A defective blower wheel will not spin properly and will not vent the hot air, making the dryer too hot. Check to see if there is adequate airflow out of the dryer.


https://www.youtube.com/watch?v=3m5NZvY9V5Q

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Dryer runs then shuts down wont start up for an hour:
Bad motor windings OR DRYER OVERHEATING:

Heating Element
A defective heating element can make a dryer too hot. If the element partially shorts out, it can produce heat all the time, regardless of whether the dryer is calling for heat. Remove the heating element to inspect it. The coils should not be touching each other or anything else.

Other Causes and Conditions
Air Flow Problem
Dryers need good ventilation to work properly. If the vent is clogged it can make the dryer too hot. Clean all of the vent tubing thoroughly.

Cycling Thermostat
Although not common, a defective cycling thermostat can make the dryer too hot. The cycling thermostat is supposed to turn on and off the heat to maintain the proper temperature. If the thermostat is defective it may keep the heat on too long. The thermostat is not adjustable or repairable, it must be replaced.

Felt Seal
Most dryers have a felt seal at the front and rear of the drum to keep the heat inside the drum. If the felt seal is worn away or missing, the dryer may keep heating and make the dryer too hot. This is not common.

Blower Wheel
A defective blower wheel will not spin properly and will not vent the hot air, making the dryer too hot. Check to see if there is adequate airflow out of the dryer.


https://www.youtube.com/watch?v=3m5NZvY9V5Q

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DRYER OVERHEATING:

Heating Element
A defective heating element can make a dryer too hot. If the element partially shorts out, it can produce heat all the time, regardless of whether the dryer is calling for heat. Remove the heating element to inspect it. The coils should not be touching each other or anything else.

Other Causes and Conditions
Air Flow Problem
Dryers need good ventilation to work properly. If the vent is clogged it can make the dryer too hot. Clean all of the vent tubing thoroughly.

Cycling Thermostat
Although not common, a defective cycling thermostat can make the dryer too hot. The cycling thermostat is supposed to turn on and off the heat to maintain the proper temperature. If the thermostat is defective it may keep the heat on too long. The thermostat is not adjustable or repairable, it must be replaced.

Felt Seal
Most dryers have a felt seal at the front and rear of the drum to keep the heat inside the drum. If the felt seal is worn away or missing, the dryer may keep heating and make the dryer too hot. This is not common.

Blower Wheel
A defective blower wheel will not spin properly and will not vent the hot air, making the dryer too hot. Check to see if there is adequate airflow out of the dryer.
https://www.youtube.com/watch?v=3m5NZvY9V5Q
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Heating Element
A defective heating element can make a dryer too hot. If the element partially shorts out, it can produce heat all the time, regardless of whether the dryer is calling for heat. Remove the heating element to inspect it. The coils should not be touching each other or anything else.

Other Causes and Conditions
Air Flow Problem
Dryers need good ventilation to work properly. If the vent is clogged it can make the dryer too hot. Clean all of the vent tubing thoroughly.

Cycling Thermostat
Although not common, a defective cycling thermostat can make the dryer too hot. The cycling thermostat is supposed to turn on and off the heat to maintain the proper temperature. If the thermostat is defective it may keep the heat on too long. The thermostat is not adjustable or repairable, it must be replaced.

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Most dryers have a felt seal at the front and rear of the drum to keep the heat inside the drum. If the felt seal is worn away or missing, the dryer may keep heating and make the dryer too hot. This is not common.

Blower Wheel
A defective blower wheel will not spin properly and will not vent the hot air, making the dryer too hot. Check to see if there is adequate airflow out of the dryer.
https://www.youtube.com/watch?v=3m5NZvY9V5Q
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Dryer runs then shuts down wont start up for an hour:
Bad motor windings OR

DRYER OVERHEATING:

Heating Element
A defective heating element can make a dryer too hot. If the element partially shorts out, it can produce heat all the time, regardless of whether the dryer is calling for heat. Remove the heating element to inspect it. The coils should not be touching each other or anything else.

Other Causes and Conditions
Air Flow Problem
Dryers need good ventilation to work properly. If the vent is clogged it can make the dryer too hot. Clean all of the vent tubing thoroughly.

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Although not common, a defective cycling thermostat can make the dryer too hot. The cycling thermostat is supposed to turn on and off the heat to maintain the proper temperature. If the thermostat is defective it may keep the heat on too long. The thermostat is not adjustable or repairable, it must be replaced.

Felt Seal
Most dryers have a felt seal at the front and rear of the drum to keep the heat inside the drum. If the felt seal is worn away or missing, the dryer may keep heating and make the dryer too hot. This is not common.

Blower Wheel
A defective blower wheel will not spin properly and will not vent the hot air, making the dryer too hot. Check to see if there is adequate airflow out of the dryer.


https://www.youtube.com/watch?v=3m5NZvY9V5Q

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YES NOT UR THERMAL FUSE.
BUT MAYBE AN OVERHEATING ISSUE

DRYER OVERHEATING:

Heating Element
A defective heating element can make a dryer too hot. If the element partially shorts out, it can produce heat all the time, regardless of whether the dryer is calling for heat. Remove the heating element to inspect it. The coils should not be touching each other or anything else.

Other Causes and Conditions
Air Flow Problem
Dryers need good ventilation to work properly. If the vent is clogged it can make the dryer too hot. Clean all of the vent tubing thoroughly.

Cycling Thermostat
Although not common, a defective cycling thermostat can make the dryer too hot. The cycling thermostat is supposed to turn on and off the heat to maintain the proper temperature. If the thermostat is defective it may keep the heat on too long. The thermostat is not adjustable or repairable, it must be replaced.

Felt Seal
Most dryers have a felt seal at the front and rear of the drum to keep the heat inside the drum. If the felt seal is worn away or missing, the dryer may keep heating and make the dryer too hot. This is not common.

Blower Wheel
A defective blower wheel will not spin properly and will not vent the hot air, making the dryer too hot. Check to see if there is adequate airflow out of the dryer.


https://www.youtube.com/watch?v=3m5NZvY9V5Q

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