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fan won't turn off

grumpyb
grumpyb Member Posts: 8
in A-C, Heat Pumps & Refrigeration

I have a goodman 2.5 ton heat pump ,

i purchased it in 2020 when covid hit and could'nt get anyone to even return my calls to braze the lines , so I tried to doi myself several times and just ended up ruining the compressor, fast forward to 2024 and ended up replacing the whole outdoor unit with a new one and a new a coil in the air handler, Had the lines hooked up the ac ran fine all summer, when I switched to heat it blew the 5 amp fuse in the air handler, I blew several fuses and ran out and put a 10 amp in and proceeded to fry the 24 volt transformer , replaced that and als put another thermostat in and and the heat worked but I found that the fan runs all the time, replaced the circuit board thinking it might be damaged but no change, I can un plug the thermostat and the fan continues to run , it shows fan ide but still runs , looked at some info on line and it says it could be the sequencer but it has none , should it have one, I bought one but have no idea what wires should go into it, sorry about the long post but I wanted to show what I have already tried, any help be appreciated.

Comments

  • 109A_5
    109A_5 Member Posts: 1,672

    Hello grumpyb,

    " Had the lines hooked up the ac ran fine all summer, when I switched to heat it blew the 5 amp fuse in the air handler, I blew several fuses and ran out and put a 10 amp in and proceeded to fry the 24 volt transformer "

    This is why you use an appropriately sized incandescent lamp for troubleshooting and not fuses or Li'l Popers. With an overload the lamp simply lights up bright, no overload the lamp remains dim.

    Goodman 2.5 ton heat pump, Model number ?

    Something has to be controlling the fan. Or it is hooked up wrong.

    National - U.S. Gas Boiler 45+ Years Old
    Steam 300 SQ. FT. - EDR 347
    One Pipe System
  • HVACNUT
    HVACNUT Member Posts: 6,332

    You blew the transformer by putting in a 10 amp fuse, replaced the transformer, and now it works, aside from the fan issue? Is it still a 10 amp fuse? Did you replace a 40 va transformer with a 75 va transformer?

  • grumpyb
    grumpyb Member Posts: 8

    same transformer as the one It had, the only difference was

    i replaced the thermostat with a new one , the old one had batteries and I also had a 24 volt line hooked up I thought maybe it was sending double voltage and blowing the fuse, biggest question is should it have a sequencer wired in , it has aux heat strips that was just a plug and play

  • grumpyb
    grumpyb Member Posts: 8

    model number is aruf31b14ab

  • 109A_5
    109A_5 Member Posts: 1,672
    edited December 8

    I'd be looking at what is going on at the EBTDR (Electronic Blower Time Delay Relay) be for I started modifying things away from the manufacture's engineering.

    image.png

    https://igate.northernplumbing.com/manuals/goodman/aruf31b14.pdf

    National - U.S. Gas Boiler 45+ Years Old
    Steam 300 SQ. FT. - EDR 347
    One Pipe System
  • 109A_5
    109A_5 Member Posts: 1,672
    edited December 7

    Verify the motor wiring with the diagram in the last post.

    image.png

    https://igate.northernplumbing.com/manuals/goodman/aruf31b14.pdf

    National - U.S. Gas Boiler 45+ Years Old
    Steam 300 SQ. FT. - EDR 347
    One Pipe System
  • grumpyb
    grumpyb Member Posts: 8

    can you tell me where it is located , is it part of the circuit board

  • grumpyb
    grumpyb Member Posts: 8

    is it the square box on the circuit board or what they call the sequencer

  • EdTheHeaterMan
    EdTheHeaterMan Member Posts: 9,380

    I'm afraid to touch this one. if you keep blowing 5 amp fuses, then you put a 10 amp fuse in there in order to make the obvious short circuit melt the transformer, you should take some basic electric classes before you melt the transformer on the electric pole outside, and cause the neighborhood to be without electric for a few hours.

    Good Luck guys.

    Edward Young Retired

    After you make that expensive repair and you still have the same problem, What will you check next?

  • grumpyb
    grumpyb Member Posts: 8

    How the hell would I melt the transformer on the electric pole when it goes through a circuit breaker , maybe you should take the classes

  • 109A_5
    109A_5 Member Posts: 1,672

    We are talking about the evaporator motor, right (the fan that keeps running) ? Well two of the motor wires go right to it (the EBTDT). It should not be too hard to find. The drawings in the manual don't identify any parts.

    National - U.S. Gas Boiler 45+ Years Old
    Steam 300 SQ. FT. - EDR 347
    One Pipe System
  • grumpyb
    grumpyb Member Posts: 8

    the motor that circulates the air through the house, I assume thats the evap motor, sorry don't know all the correct terminology thanks I will look at it tomorrow

  • 109A_5
    109A_5 Member Posts: 1,672
    edited December 8

    The EBTDR (Electronic Blower Time Delay Relay) may be the circuit board as you call it. You said you replaced a circuit board. The pictorial drawings in the manual are not that detailed. The manual for the model number you provided states nothing about an item called a "Sequencer". If it exists in your unit I would think it is for the electric heat.

    EBTDR (Electronic Blower Time Delay Relay) controls the motor, a thermostat switch closure between the R and G terminals activates the EBTDR.

    I would disconnect the G wire from the EBTDR and see what it does.

    Since your problems apparently preceded the circuit board change and with the series of events blowing fuses and the fan stuck on I would suspect the thermostat wires have been compromised somewhere. The R wire shorted to the C wire would blow a fuse and the R wire shorted to the G wire would keep the fan running.

    image.png

    National - U.S. Gas Boiler 45+ Years Old
    Steam 300 SQ. FT. - EDR 347
    One Pipe System
  • Jamie Hall
    Jamie Hall Member Posts: 24,857

    Actually, upon being inspired to think about it, I can think of several ways a clueless individual (or one bent on mischief) could blow a pole transformer without blowing a home circuit breaker. In a prior life I was paid and deployed to think of such things (that was a VERY long time ago)…

    Br. Jamie, osb
    Building superintendent/caretaker, 7200 sq. ft. historic house museum with dependencies in New England
    EdTheHeaterMan
  • 109A_5
    109A_5 Member Posts: 1,672
    https://forum.heatinghelp.com/discussion/comment/1825540#Comment_1825540

    Well if the Power Utility did their due diligence correctly it should only blow the primary side fuse, they are loud when they blow.

    National - U.S. Gas Boiler 45+ Years Old
    Steam 300 SQ. FT. - EDR 347
    One Pipe System
  • grumpyb
    grumpyb Member Posts: 8

    checked the thermostat wires and couldn't find any shorts , it has 2 what I would call limit switches where the elec heat strips are located , I pulled them out and they are rusty on the part that goes inside the air handler, they feel springy when I push on the back of them , just a thin piece of metal but no way to know what they look like inside so I ordered 2 new ones, I believe the board I replaced is a relay board, all there is besides those 2 things is a block where the heat strips tie into and gets power for them and the fan , it has a coil on the back of it so I assume it contacts inside but I can't find a good number on it to replace it if it may be the problem

  • 109A_5
    109A_5 Member Posts: 1,672

    " I would disconnect the G wire from the EBTDR and see what it does. "

    So what happened when you disconnected the G wire from the EBTDR ???

    You really need to follow the logical flow of the fan control, not just randomly fussing with stuff then replacing it.

    image.png

    National - U.S. Gas Boiler 45+ Years Old
    Steam 300 SQ. FT. - EDR 347
    One Pipe System
  • EdTheHeaterMan
    EdTheHeaterMan Member Posts: 9,380
    edited December 9
    https://forum.heatinghelp.com/discussion/comment/1825518#Comment_1825518

    You are the one burning up transformers. Not Me!

    Oh Jamie, You are my hero!

    Edward Young Retired

    After you make that expensive repair and you still have the same problem, What will you check next?

  • pecmsg
    pecmsg Member Posts: 5,293
    https://forum.heatinghelp.com/discussion/comment/1825518#Comment_1825518

    it can happen!

  • HVACNUT
    HVACNUT Member Posts: 6,332
    https://forum.heatinghelp.com/discussion/comment/1825529#Comment_1825529

    That statement should mean you won't look at anything tomorrow, but you will make calls to people who know just a wee bit more about HVAC. If that's the correct terminology. You're out of your depth. Call a professional. Pretty please.

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