Posted on 13 Comments

Problem: Furnace comes on, doesn’t run long then shuts off. Will work if thermostat is turned way up.

Problem: Furnace comes on, doesn’t run long then shuts off. Will work if thermostat is turned way up.

Answer: This sounds like a thermostat problem or an over-heating problem. I would suggest taping the furnace door safety switch closed so it allows the furnace to stay on so you can test the controls.  Test with a volt meter set to volts AC and see if you are getting 24 to 28 volts between the W and C (com) terminals on the control board from the thermostat when the furnace shuts off. If you see that 24 volts goes to zero between W and C when the furnace shuts off then the thermostat is cutting the furnace off and you have a thermostat problem. If you continue to get 24 to 28 volts between W & C then you have another control shutting the furnace off. This could be a safety control like a limit, rollout switch or pressure switch cutting the furnace off.  Test the limit with you volt meter.  If the limit is going to zero (open) then you would have a furnace over-heating problem which could be caused by a slow blower motor, (please check the capacitor) could be a stopped up filter, AC evaporator coil or the gas valve maybe outputting too much gas into the furnace.  Below we have a YouTube video that was made by Grayfurnaceman which shows how to troubleshoot a furnace limit. I hope this video will help you out. Thanks to Grayfurnace man!  Thanks so much for your interest in our website! If you have any questions please feel free to email us at: arnoldservice@gmail.com or respond in the comments section near the bottom of this page. We hope you have a blessed day! Steve & Barbara Arnold

13 thoughts on “Problem: Furnace comes on, doesn’t run long then shuts off. Will work if thermostat is turned way up.

  1. Hi
    I have a new Goodman gas furnace with two stages of heating, which is installed and runs well for months. But recently it appears a problem: the flame turns off in few seconds when it switches to the second stage of heating. Do you have an idea about such a problem and solution? I would appreciate it if you could give me a clue. Thank you!

    1. Hi Peter! I am sorry, but I have no idea why the flame would shut off and come back on when changing from high to low heat. My only guess would be that if you have a two-stage thermostat the thermostat might have a delay between stages. Most of the time if it is like my two-stage Bryant furnace I have the low and high heat set up where the control board determines whether the furnace should be in high or low heat based on the length of time that the furnace runs in low heat. If my furnace runs longer than 10 minutes in low heat the control board automatically without any delay sends the furnace into high heat. I can hear the blower, draft inducer and gas pressure increase when my furnace goes into high heat. You might see if your thermostat is causing the problem. I hope that you can easily find the solution. Sorry that I am not a Goodman dealer and do not know about the new Goodman high-efficiency furnaces. Steve

  2. I have a 20 yr old Goodman PGM060150 rooftop package unit. It will occasionally not reach target heat, showing a 2 blink error code (Open end switch). The end switch is integrated into the exhaust motor, so I replaced the motor/switch component, but I still get exactly the same error condition. (I’ve also cleaned the flame sensor on principle.)

    Is it possible that the flame sensor is faulty and shutting down the exhaust motor, thus triggering the open end switch code? (I note that there is no specific code for a flame sensor failure.)

    I also note that just barely touching (jiggling) the power wire (or common wire) connection from control board to the exhaust motor usually results in it reinitiating. Possible short in connection on control board?

    any thoughts?

    1. Hi Lee! I am sorry, but I do not know what an “open end switch” code error means. I have heard of open limits, open rollouts and open pressure switches, but not “end switches”. Yes, It sounds like you have a short in the wire connection or control board. You should not be able to wiggle any wires and cause the draft inducer motor to start up. You might need a new control board. I was trying to look up parts, but our Goodman parts program does not find any models that start with “PGM” I am sorry that I can not help you out. Steve

      1. I have a 20 yr old Goodman PGM060150 rooftop package unit. It will occasionally not reach target heat, showing a 2 blink error code (Open end switch). The end switch is integrated into the exhaust motor, so I replaced the motor/switch component, but I still get exactly the same error condition. (I’ve also cleaned the flame sensor on principle.)

        Is it possible that the flame sensor is faulty and shutting down the exhaust motor, thus triggering the open end switch code? (I note that there is no specific code for a flame sensor failure.)

        I also note that just barely touching (jiggling) the power wire (or common wire) connection from control board to the exhaust motor usually results in it reinitiating. Possible short in connection on control board?

        any thoughts?

        Sorry, my bad, the furnace model is PGB060150 rather than PGM060150

        The end switch is an independent verification that the inducer motor is running (same function as the pressure switch, I think)

        I’ve subsequently replaced the flame sensor and replaced a couple of electrical connectors that seemed questionable. I’m now thinking it must be in the control board (worn or dirty relay)?

      2. Hi Lee! I am sorry, but I do not know what an “open end switch” code error means. I have heard of open limits, open rollouts, and open pressure switches, but not “end switches”. Yes, It sounds like you have a short in the wire connection or control board. You should not be able to wiggle any wires and cause the draft inducer motor to start up. You might need a new control board. I copied a parts list for your furnace below but I do not see a control board listed. I am sorry that I can not help you out. Steve

        Total: 70 Model#: PGB060150-1 Mfg#: PGB060150-1
        Part Number Description Type Substitution
        B1086748S FAN BLADE 22″, 3 BLADE, 30º
        B1141643 TRANSFORMER 208/230, 24V F 0130M00138
        B1219225 SINGLE-FLOW FILTER DRIER, STEEL
        B1282628 GAS VALVE (36G) F B1282628S
        B1339533 GROMMET, COMPRESSOR (SCROLL &
        B13400208S BLOWER MOTOR F
        B13400248S COND MOTOR 1/3 HP, 1 SP, 230V F 0131M00008PS
        B1368000S BLOWER WHEEL 11 X 10 F
        B1370113 AUXILIARY LIMIT SWITCH 120ºF F
        B1370154 ROLL OUT SWITCH, 350º W/O BRKT. F
        B1376857 MOTOR MOUNT ARM
        B1376923 FAN GRILLE GUARD, LRG 0152G00002S
        B1392136 VIEW PORT BUSHING-BLOWER DOOR 2″
        B1393701 COMPRESSOR BOLT & SLEEVE ASSY
        B1401012 DIRECT SPARK IGNITOR* F
        B2114890 FLOWRATOR .090 [COND]
        B2526004 MANIFOLD – 6 BRNR
        B2589343 #43 ORIFICE
        B2913601 CHIMNEY EXTENSION (LRG)
        B2959000S VENT MOTOR F
        B4022700S INSHOT BURNER ASSY 3″*
        CAP050800440RTS CAPACITOR 5/80/440V F CAP050800440RTP
        CAP150000370VAS CAPACITOR 15/370V F CAP150000370VAP
        CONT2P040024VS CONTACTOR 40 AMP, 2P, 24V F
        HI-113 USERS MANUAL S OBSOLETE
        IO-148C INSTALLATION INSTRUCTIONS S OBSOLETE
        IO-149 INSTRUCTIONS, WIND SHIELD S OBSOLETE
        IO-604 SPECIAL INSTR., 36G VALVE S
        IO-605 LIGHTING INSTRUCTIONS, W/36G S
        RP-241C REPAIR PARTS LIST S
        TP-105 TECHNICAL PUBLICATION S
        ZR57K3PFV950 COMPRESSOR 57500, 208/230/60/1 F ZR57K3PFV930
        0121M00038 MOTOR MOUNT BAND
        0130F00010 FLAME SENSOR F
        1262502 TUBING ASSY, COND COIL LRG
        1262606 TUBING ASSY, EVAP COIL OBSOLETE
        1284835 CAPACITOR STRAP
        1370909S PRIMARY LIMIT SWITCH 160ºF F
        1864700 BLOWER CUT-OFF 10 X 10 1864700F
        1900807 BASE PAN CHANNEL ASSY [QTY 2]
        1900809 CHANNEL ASSY, BASE PAN
        1901701P CONTROL BOX PANEL OBSOLETE
        1902803P DRAIN PAN ASSY LRG OBSOLETE
        1903012S DAMPER BLOCK-OFF OBSOLETE
        2509503F AUXILIARY LIMIT BRACKET 2509503
        2510003S FLUE COLLECTOR BOX 24.5″
        2513504 BURNER RACK 6 CELL OBSOLETE
        2514000 SIDE PLATE, BURNER BOX 0121F00146
        2528003S FLUE RESTRICTOR PLATE 2.250 DIA
        2539302S BLOWER HOUSING 11 X 10 2539302F
        2907003P WIND SHIELD, FRONT LRG
        2921308S SUB ASSY, HEAT EXCHANGER
        2922307S CHUTE ASSY, BLOWER LRG 6 CELL
        2922400S INDOOR FAN PANEL
        2923000S RETURN DUCT BLOCK OFF [OBSOLETE] OBSOLETE
        2923001S SUPPLY DUCT BLOCK OFF
        2923300P GAS ACCESS PANEL
        2923400P LOUVER PANEL, FRONT
        2923500P LOUVERED SIDE PANEL
        2923800S REAR PANEL
        2923801S DUCT PANEL LRG
        2923900S PARTITION PANEL
        2924201P TOP PANEL [OBSOLETE] OBSOLETE
        2924500S BASE PAN LRG OBSOLETE
        2937000 SIDE SHIELD, INTERNAL
        2937001P SIDE SHIELD, EXTERNAL OBSOLETE
        2937002P WIND SHIELD, EXTERNAL TOP OBSOLETE
        2968400 FEMALE PLUG ASSY
        4013009 BURNER BOX TOP 6 CELL
        4053501S CHIMNEY ASSEMBLY

  3. I have a gas dryer that takes over 60 seconds (70+ average) for the gas to turn on after the ignitor glows red. That seems to be too long for the gas to kick in. Does that indicate that perhaps one of the solenoids is failing? Thoughts?

    1. Hi Raff! I am sorry, but I do not know about gas dryers or appliance repair. Our site is dedicated to HVAC furnace and air conditioner troubleshooting and repair. Sorry that I can not give you an answer because I am not familiar with appliance repair. I hope you can find the answer on another site. Steve

  4. replaced flame sensor burner stay on few sec what else could happen

  5. I have a nordyne mobile home furnace.had a tecnition out yesterday.he replaced the thermocouple.and cleaned ignitor it ran for about 1hr then wouldn’t heat again. So he turned it all the way down and back up to 75. Then it ran all nite.got so warm I turned it down about 4 am so it must never have worked again very cold in here….the tection says he don’t know what’s wrong if he can’t fix I’m not paying him. Please help need heat in ia

    1. Hi Judy! I am very sorry to hear that you are cold and your furnace is not working. I am very sorry, but about the only way to tell what is wrong is by testing the wiring and components with a volt meter. Where the voltage stops is generally where the problem is located. You will need to troubleshoot the furnace and I know some mobile home furnaces are not in the easiest to get to locations. We have lots of furnace troubleshooting advice on the following page: https://arnoldservice.com/gas-electric-furnace-troubleshooting-simplified-2/ I would suggest going through the troubleshooting flow chart to see what is wrong: https://arnoldservice.com/wp-content/uploads/2014/12/furnace-troubleshooting-flow-chart.pdf We also have lots of troubleshooting questions and answers on the following page: https://arnoldservice.com/furnace-troubleshooting-questions-answers-index/ If you have any specific questions please let me know. Thanks! I hope you can easily find and fix the problem. Steve

  6. I will be happy to try and answer any questions you have. Thanks so much for your interest and support in our website! Hope you have a blessed day! Steve Arnold

Leave a Reply

Your email address will not be published. Required fields are marked *