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Carrier 58RAV095-16 will process thru the test sequence properly: inducer fan, ignitor, blower high, blower low, all ok. fuse checked good on controller board. when commanded to supply heat by the thermostat controller in the living space the unit runs with fan only, no gas, no ignition. changed thermostat controller, no joy. Comments: Jan 31, 2010 - thermocouple/ignitor is ok and positioned well. It tests ok too. I changed it last year. I am not getting gas flow so I suspect gas control valve, control circuit, or controller board. if i start from point zero and dial up the thermostat, the fan begins to run but the ignitor never heats up and the gas doesnt flow. if i close the circuit between the 2 test poles to initiate the test, i get a good test sequence including hot ignitor/thermocouple. Thanks, Larry Jan 31, 2010 - Carrier 58RAV095-16 A/C Air handler and gas furnace. Will not heat, fan only. thermocouple/ignitor is ok and positioned well. It tests ok too. I changed it last year. I am not getting gas flow so I suspect gas control valve, control circuit, or controller board. if i start from point zero and dial up the thermostat, the fan begins to run but the ignitor never heats up and the gas doesnt flow. if i close the circuit between the 2 test poles to initiate the test, i get a good test sequence including hot ignitor/thermocouple. Thanks, Larry See less

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Go to the furnace and turn off the power take the door off you must have a multimeter inhand with the cover off the furnace and access to the gas valve put yor meter leads on the wires going to the gas valve turn the power on and after the ignitor glows up there should be power to the gas valve to open and turn burners on if there is then the gas valve is probably bad. You can also try ohming out the gas valve terminals witha multimeter if it ohms out it is probably bad id it doesn't then the gas valve is probably bad. This sould get you started if you have no power to the gas valve then you need to start tracing power and checking switches check the vent pressure switch with an ohm meter as well as all the limits in the furnace like the high limit and the rollout switch with the ohm meter.

Posted on Feb 07, 2010

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No heat from furnace, Goodman GMPN080-4 Rev A. Cycle is solid red status light, then 3 flashes indicating open pressure switch because the inducer fan does not come on.


Jimbo, it sounds like you are aware of the operational sequence to suggest using a voltmeter to check the actual wires going TO the combustion air fan...if there is no voltage from the board, the board is bad. Just make sure one of the high temp limits are not open... one may be in the blower compartment on some and one will be near the top of the vestibule and a roll out switch should be near the burners. They should all be wired in series.

Always check the manual reset safty switches as the first step in troubleshooting.

Nov 21, 2015 | Goodman Heating & Cooling

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Heater check out list for heater failures


Almost all furnaces built after 1978 have intermittant type pilots.
Ca banned them requiring electronic spark or hot surface ignitors, followed by induced draft motors, pressure switches or centrifigal switches that "prove" a induced draft exists, allowing the pilot sequence to commence.
electronic spark type units have a high voltage low amperage spark that is AC. Fire rectifies electricity that passes through it meaning AC becomes DC ! Fire is a terrible conducter however as a result , the DC signal is only milliamps/volts signal strength. the DC prescence is proof a flame exists for pilot, and safe to commence to mainburners.

As long as pressure switches stay closed, safeties and limits stay closed
and the DC signal to the ignition module is not broken, the furnace will run.

The normal sequence of operation is upon a call for heat from the thermostat a 24 volt signal is sent to W white (heat circuit) at the low voltage terminal board on furnace.
from there depending on unit and age the heat circuit may include a circuit board, but it still has the typical limits and safetys reqired for operation
its just not using electromechanical relays to control fan and induced draft motor etc.

for the induced draft to begin ,all limits, safetys in heat circuit must be closed.

induced draft begins and a proving switch, either pressure or centrifigal close allowung the pilot to begin, a spark or hot surface ignitor is energized and a pilot flame established,modern types use flame rectification to prove a flame, older Carrier, Payne,types have a 3 wire switch in the piloyt assembly that is a bi metal that expands and contracts clicking open and shut, allowing pilot or main burners, depending if cold or hot.

pressure switches are attached with tubing to the induced draft wheel housing and sense pressure differential and close upon induced draft running, the orifices that the tube attaches to on induced draft housing often plugs or is restricted causing pressure switch to fail to close, or waver on open and close , open , close, .

if you can run the fan in the on postion , you have both high and low voltage to the furnace.

if you dont have fan control check power, breaker , fuses.

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1 Answer

Gas dryer won't light. Ignitor glows red and I can smell the gas, but no ignition. New coils didn't fix problem. Any ideas what to try next? Hamper full and wallet empty- please help!


Is your inducer fan coming on first? I know on a gas heat pump yu will hear the fan/inducer turn on for a few seconds, then the igniter will lite, then yu will hear it fire up, this is a safety feature sequence, no gas movement thru system, no ignition, also check the exhaust pipes for holes or cracks

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2 Answers

THE DRAFT BLOWER IS TURNING ON BUT NOT FIRING UP WORKING ALL DAY STOPPED OVERNITE


The induced draft motor has a induced draft proving switch that is a pressure switch , it resembles a silver round flat device about 4 inches across with 2 wires, it will have a tubing attached to it that also is attached to the induced draft assembly housing on a barbed port, this is how the induced draft is "proven" thus giving the A OK to go to the next sequence of operation which is ignition trial period, it will attempt a ignition sequence for about 30 seconds 3 times before it will lock out if it has a circuit board, if so a flashing code will be observed and the legend in the back side of the blower door will tell you the codes meaning.
What is wrong 80% of the time is the barbed port on the induced drafts assembly is obstructed by carbon and not allowing the pressure switch to "sense" / prove the induced draft motor is running. You can connect the pressure switches 2 wires after the induced draft begins, this simulates a operational pressure switch and should begin the ignition phase if all is well, otherwise if all safety's or high limits are closed, then the ignition module is bad.

This is for spark type, if you have a hot surface ignitor look to se if its broken or cracked or has a burned spot visible, if not try testing for 120 volts to it, if you read proper voltage, then the hot surface igniter is bad. 25360510-wil0gxehsfojcry3vcxysbjd-1-0.png

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Many have a small 3A fuse similar to a car type push in fuse on the main board.

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power to gas valve ok .. Replace gas valve after checking gas valve coil for continuity/resistance... with valve removed ...and power to valve ... try blowing thru valve from supply side ... stuck valve.... replace...

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1 Answer

Bryant furance cat.# 333BAV048080, with A/C cooling selected, blower motor during high speed operation stopped running, but the outside A/C unit was still running.Check that the motor is free wheeeling....


Hello, sincebthe motor will not run in heating and cooling the first thing to do is check the capacitor, set your meter to ohms and disscharge the capacitor with a screwdriver, if the capacitor is good the meters numbers should ramp up and down, if not the capacitor is bad. To check the motor turn off power to the unit and take you meter and measure from the common wire to each other wire coming from the motor, you should have resistance,if not the motor is bad and must be repalaced. To check the board place one meter lead on the cool/high speed motor tap and the other lead to ground, if therebis no power on a call for cooling the board is bad.

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1 Answer

Speed fun control airconditioned doesn´t work property.


Two possible areas I would check using an ohm meter. First is the blower resistor which is usually located by the blower motor and looks like a cement rectangle or a ceramic tube with wires attached to it. The resistor should have very low resistance but should not read open from the common lead to the other terminals. If it tests good test the continuity of the fan switch. Some cars have a fuse for the high and low blower speeds so you can check your fuse diagram and look for two blower or fan fuses. Good Luck.

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1 Answer

Blower comes on and heater don't


Blower comes on then I am assuming no ignition attempt afterwards? If the blower ( Induced Draft Fan) is not being sensed by the safety pressure switch, ignition attempts are aborted until the fan is sensed. If there is a blockage in the vent system, ID blower or sense tubing itself, those would be the obvious starting points to check. If the pressure switch "makes" (closes) then your investigation should lead you to the ignition process. Is there a spark at the pilot burner (if there is one), Is the Hot Surface Ignitor glowing? Is the gas turned on? All can be checked visually.

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1 Answer

Weathermaker 8000 furnance flashing code 31 blower comes on for 90 sec .. then shuts off .. then other fan goes on.. don't see any flames or lighting goin on can you help?


31 PRESSURE SWITCH DID NOT CLOSE OR REOPENED - If open longer than five minutes,
inducer shuts off for 15 minutes before retry. Check for: - Excessive wind
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- Low inducer voltage (115VAC) - Defective pressure switch
- Inadequate combustion air supply - Disconnected or obstructed pressure tubing
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