Question about Goodman GMS90703BXA Heater

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Furnace Short Cycling when cold ----- again.

We had the classic bad or dirty flame sensor (thermocoupler) problem where the furnace would short cycle until the sensor warmed up. Usually after 4 or 5 trys. We cleaned the flame sensor with no improvement so we bought a new sensor. The problem went away for 1 week. Now the trouble is back.

What now?

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I take it this is a forced air heater,if so, ther is a relay and thermal switchs involved plus possible a sail switch in the fan housing, check circuits, oil fan motor bearings

Posted on Jan 31, 2010

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Mobile Home Furnace Problem. I have replaced the furnace "board" [$150.00] and the thermostat [$65.00] and my furnace still turns itself off during night time hours - only. Is there anything else...


What you are describing is a lock-out condition that occurs after the furnace attempts to establish flame three times (usually) and fails, necessitating manual cycling of the power to 'reset' the circuit board. Its unusual that it is only happening at night unless the night temps drop extremely lower in you location than the daytime temps and the heat loss is greater so the furnace needs to come on more ofter. Hmmm.... Still a bit odd.

I'd have a tendency to inspect the flame rod or flame sensor and its connections back to the 'sensor' spade clip on the circuit board. It is responsible for signalling the control board that the flame has been established so gas can continue to flow feeding the flames. If it does not send the signal in a few short seconds after the gas valve opens, it shuts the system down and it re establishes the cycle again....only up to three times before a lockout.

Your system may not have a separate flame sensor and if not the ignition electrode or hot surface igniter itself performs double duty as the ignition device AND the flame sensor. If so, check the connections and make sure there is no oxidation between the wire and the connector.

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My furnace will not reach the desired house temperature in one cycle. It will run for several minutes, shut off, and repeat. It eventually reaches the desired temp but it take a long time and I feel it...


There are a few different reasons for short cycling of a furnace.
1. Inadequate air flow. Not enough air moving through the furnace can cause it to overheat and trip the high temperature limit switch.
check to see that all registers are open and returns are not blocked.
2 Improper heat anticipator setting on thermostat. Some thermostats have a heat anticipator and too low of a setting can cause short cycling.

4 Partially blocked drain hoses. If the condensate backs up into the furnace it can shut the flame off and then when the condensate drains the furnace starts again. Check all drain hoses to make sure they are clear.
These are just some of the possible reasons for short cycling .
Hope this helps.

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1 Answer

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If your furnace has an ehxaust fan, your furnace does not have a thermocouple, it has a flame sensor. The flame sensor is a small metal rod that is in the burner area. It has one wire leading to it. Your problem seems to be flame sensor. If unit does not sense flame, it will kick off the gas valve.
Turn power off, take sensor out, (should be on 1/4" hex screw).. Probably some white film on sensor. Clean with steel wool, or dollar bill if don't have steel wool. Replace sensor.

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1 Answer

Carrier super saver furnace keeps going on and off


Sounds like the flame sensor is dirty or bad. This sits in the burner flame when the burners are running. This usually has a single white wire connected to the back of it.

Jan 03, 2010 | Dayton Gas Furnace Heater

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I have a Rheem Classic Series Super Quiet 80 gas furnace. My problem is the furnace will turn on burner fires for a couple of seconds then burner turns off and fan blows. This cycle cotinues and eventualy...


Sounds like it could be a dirty or bad flame sensor.
When the burner lights ,there is a flame sensor in the flame and it is suppose to sense the flame and send a signal back to the control board which will keep the gas valve open, if it gets dirty or is bad it doesn't send the signal back to the board and the board will shut the gas valve off and after three tries it will lock out the furnace and you have to reset it to get it to work again.
The flame sensor looks like a wire and it's in the flame usually it will get gas deposits on it, then it won't work.
You can clean this sensor with an extra fine piece of steel wool, but before you attempt to do this DISCONNECT ALL POWER TO THE FURNACE.

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Ruud furnace Model URKA A030jK08 Code opt 589


Flip the lower panel over and look for a wiring diagram. On that diagram there will be a diagnostic chart. Let me know what 5 blinks represent. Then I want you to read on.

On a call for heat, the 24 volt thermostat sends a signal to the control module. The control module will indicate a call for heat with a light on the control either blinking or remain solid depending upon model. The inducer (exhaust) blower will purge all gasses from the furnace and pressurize a pressure switch. Once the pressure switch tells the module to continue, the electronic ignition will energize and send 120 volts to the igniter. The igniter will glow and you will be able to see it if viewed thru the small inspection port. Once the igniter gets hot enough, it sends a signal to the module opening up the gas valve (24 volts). Either a pilot will come on or the burner tube will ignite then spread the flame to all burners. Lastly a safety sensor will be looking for a certain temperature within a few seconds and the furnace will continue to operate and the room air blower will turn on in a minute or two.

What could go wrong? The unit will not run if there is no signal from the thermostat (bad thermostat or broken wire), the control module does not sense a signal from the thermostat (bad control), the inducer does not energize (bad motor), the pressure switch does not close (blocked vent piping, bad switch, plugged condensate hose), the igniter does not energize (bad control, bad igniter), the gas valve does not open or there is no gas (bad gas valve, broken wire, no gas), the pilot does not light (dirty pilot), the burner does not light (bad burner, plugged orifice, not enough combustion air), the flame does not spread to each burner (bad flame spreader, dirty flame spreader, more bad burners), the flame safety sensor does not detect flame (dirty or bad flame spreader, bad flame sensor, broken wire, bad control), or the room air blower does not energize (bad fan motor, bad control).

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1 Answer

Short cycling..continually..minimal heat


Is this furnace standing pilot or electronic? if standing pilot turn power off then take t-stat off wall and connect the wires labeled r and c together and see if that keeps furnace working. If electronic check flame sensor you can check flame sensor buy cleaning with steel wool. if that doesn't work then try t-sat.

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Furnace stops before set temp is reached. continously cycles like this Therm ok, tested, bypased with same effect.


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