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38TRA060340 Should the fan come on when the furnace goes on?

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If the fan switch is set to "AUTO" on your thermostat, yes. "ON" is 24/7 operation and "OFF" is OFF for A/C. Heat has a separate switch to engage the fan.

Posted on Mar 31, 2011

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Posted on Jan 02, 2017

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Bought a thermostat . installed it and the furnace fan will not shut down


You probably have a pair of wires for the fan and a second pair for the furnace. The thermostat should make and break the connection to the fan to turn it on and off and make/break the connection to the furnace. You should have looked at how they were connected to the old one and labeled them. You will probably have to open the furnace to see which wire goes to what. If you get the fan wired correctly the thermostat should work.

Nov 12, 2013 | Heating & Cooling

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Rheem 90+ NG Furnace. When furnace starts, draft inducer starts, ignitor glows and gas ignites. Burners stay lit for 10 seconds or so, then the flame reduces for a few seconds then goes out. Main blower...


Check the draft inducer air switch ( vacuum diaphragm switch) If the switch is opening when the burner starts, you might have a blockage on air piping coming into the furnace. Also prime the condensate trap on the condensate drain from the combustion fan. Also check the gas pressure, if your gas pressure is dropping, the gas pressure switch will shut it down. If it's too high the moment it comes on could raise the pressure in the furnace dropping out the combustion fan proving switch.

Oct 29, 2010 | Electric Circuit Breaker Kit for Furnace

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Furnace will not shut off after the setting is reached. have changed thermostat. Temperature reading goes down on thermostat, furnace still runs. Model : Goodman furnace,gmh95/gch9


Check if your thermostat is set on 'o fan' setting.
If it is, trey to set it on 'Auto-fan' instead.
since it seem as if the heating does go off,only the fan may be running continuously.
this is possible if the thermostat is incorrectly set or installed.
good luck.

Jan 30, 2010 | Goodman GMS90703BXA Heater

2 Answers

Furnace lights fan comes on then fan goes off furnace stays light until overtemp takes it out code flashes 4


Have some one hold the bottom door safety switch, turn furnace on wait until heating fan relay clicks, and check at terminal (Heat) & terminal (neutral or where all the white wires are located on the control board) for 115 volts to 120 volts. If voltage is present replace blower motor, if voltage drops out while running then replace control board.Turn power off to furnace, open bottom door and feel blower motor with hand, if motor is real hot replace motor. you can not oil this type of motor, it has to be replaced along with the compacitor. Good luck.

Jan 22, 2010 | Goodman Furnace Draft Inducer Blower ...

1 Answer

We have a dayton gas furnace model #3E463A. thought the control box was gone. got new one we furnace starts up the power goes on, fan starts no green pulsing light on control no ignition


When your furnace starts...the Ventor motor(exhaust fan) starts up....within a short time (seconds) the Pressure switch closes proving that the Fan is indeed running and the vent is not blocked...if this doesnt happen the furnace will not poweer the ignitor or fire at all....Check the vent pipe outside and look for obstructions or dirt on the screen inside the pipe...the condensate from the fuirnace may not be draining at all...due to plugged condensate drain lines...find this tube coming out of the furnace front...bottom of upper compartment usually , and pull it off the tap....if water starts coming out then your drain is plugged downstream of the furnace.

Oct 25, 2009 | Dayton Gas Furnace Heater

1 Answer

I want to know the conection between the thermostat and the fan and compressor in the central air conditions


r and rc @stat to r on furnace
w @stat to w on furnace
g @ stat to g on furnace
y @ stat to y on furnace
from furnace 2wires going to out side unit typical red & white wire. red goes to y @ furnace and white goes to the neutral of the trans former . BE SAFE turn off power.

r = Red wire Hot
w= White wire heating
g = Green Fan
y= yellow cooling

if their is a B or C @ the furnace terminal board that the neutral . Tom

Jun 14, 2009 | Fujitsu 24C1 Air Conditioner

1 Answer

Looks like my humidistat calls for coil fan and for furnace heat


It sounds like the humidifier may be improperly wired.
It's hard to solve without checking the wiring, but it seems like the humidistat is wired so that as the dial is advanced, it incorrectly turns on the fan, or furnace, or both.  The contacts of the humidistat should be wired so that they turn on the solenoid only.  Also, the power to the humidistat, to turn on the solenoid, should come on only when the fan is on.
Hope this helps!

Jan 03, 2009 | Aprilaire 550 Humidifier

1 Answer

Heating


If this is an older furnace, it is probably a wearing fan control.
Some can be adjusted, otherwise they need to be replaced.

Jan 02, 2009 | Heating & Cooling

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