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Surburban furnace upgrade from agnolog to digital LCD new board on furnace new relay box air conditioner works fine but furnace only cycles once then won't start by itself. Furnace cleaned looks ok ?

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6 Suggested Answers

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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Posted on Jan 02, 2017

SOURCE: Carrier air conditioner problem

My Carrier unit did the same thing. It was low on refrigerant (Puron in my unit). I am worried I have a leak somewhere. Hopefully, it is not in the coil. The service call wasn't cheap either. Puron runs around $10-15 a pound and mine took several pounds to replenish.

Posted on Aug 03, 2008

  • 1 Answer

SOURCE: my gas forced air furnace is shutting itself off after 2-3 cycles

there is a thermo-sensor switch next to the circuit board that tells the fan switch to turn on when the plenum is hot enough. this needs to be replaced.

Posted on Dec 16, 2008

muttandjeff
  • 359 Answers

SOURCE: Furnace is not working, digital thermostat does not register

sounds as if your low voltage transformer might have bit the bullet will need replacing all of the devices you mention are powered by this one low voltage t-stat

Posted on Jan 01, 2009

  • 92 Answers

SOURCE: Ruud achiever 90 plus won`t start at times

sounds like you have a heat pump heat pumps dont work below 30* temps you should have some type of backup heat

Posted on Feb 05, 2009

shastalaker7
  • 1515 Answers

SOURCE: Bryant-Carrier Furnace Fan Stays On

Hi, you have replaced the stat several times, and adjusted the anticipator so its not the stat.This is a split gas/elect unit, and working on these for many years and looking at some of the solutions given, they are right.You need to be looking at the Furnace fan control.Units of that age they do tend to stick open and run constantly.I doubt its the fan relay, maybe if you were in the cooling mode.Fan controls are not that expensive. You probably have a Honeywell 7" to 11" Probe, with the auto/manual button, with a temp dial to set you're on off temps. I would inspect the heat exchanger for any signs of cracks or bulging being its that old. If you find any, you are looking at carbon monoxided and should be thinking about an upgrade soon.Also flame roll out.I am thinking of you're safety is all.If you do have this type of fan control, there is a tab that has to be cut before you install for 24v. control.It comes set for 120v. and will burn out all of your 24v. componants.Those old Bryants will run for years. Good Luck!
Shastalaker7

Posted on Nov 14, 2009

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1 Answer

Can not get fan on to turn on. All else fine. heat only furnace. No air conditioning...only air circulation.I used to set it on "Cool" and "Fan On"and get air to circulate. Do I need new thermostat?


Since you have two thermostats that operate the heating unit and the fan, and the fact that neither will turn the blower on, I would suspect the furnace/ air handler. Turn the thermostat to heat and see if the heat and the fan comes on, if it does operate normally in heat, the fan relay or the high speed on the blower is most likely the culprit. (If the furnace is equipped with a circuit board, the fan relay is integral to the board, if it an older furnace it has a separate fan relay). If it does not operate normally in the heating mode, verify power to the furnace, see if the flame comes on, if it does: the fan motor, circuit board or the fan relay are most likely the cause. hope this helps!

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i would say its the relay board or communication cabl between stat and board.

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Furnace starts but fan does not start then furnace shuts off. also fan does not turn on in cool setting either. I tested the motor directly, works fine


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Air Conditioner was working fine last summer but outside fna not working. Not hearing any sound at all. I can move the fan amanually and it seems fine. There is an electrical box next to the main...


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Furnace completes cycle but the (24volts)wont keep the gas valve on.


Depending on which model you have there is a fan limit switch or a fan control or pc board that will bring the fan on once the furnace warms up some so that it doesn't blow cool air. This could be malfunctioning or the blower it;s self is malfunctioning which could be a fan relay, compasitor, or the blower motor it's self.

Sep 29, 2008 | Goodman Heating & Cooling

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