Question about Goodman GMS90703BXA Heater

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Do i remove heat exchanger from top on GMC model # gmpn100-4 for replacement

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Unfortunately through the front by removing gas valves and controls

Posted on Dec 11, 2009

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You should be able to remove it from the frnt of the furnace cabinet.

Posted on Dec 11, 2009

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SOURCE: Goodman furnace model #GPO 125_4 REV 8 Installed 6/2/2002

Have you measured the temperature in the suppy plenum? Should be 140 to 160 max. If hotter, you have a blockage in the ductwork or vents closed. If within spec, bad circuit board.

Posted on Jun 10, 2008

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2 Answers

Where is the heat exchange in a rheem pool heater located ?


The PVC plumbing is hooked into the front header, the front header is attached to the heat exchanger. The heat exchanger looks like copper finned tubes with a steel plate on each end. You need to disassemble heater working from top down to get to the exchanger. A skilled tech can replace an exchanger in under one hour service call.

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Have a Pentair Minimax Plus 400 heater leaking water. How do you get the top and flue collector (gas is turned off at source) off so you can see if the heat exchangers are leaking, or is there another way...


There are multiple screws around the perimeter, remove them then lift of the top. Then there is multiple pieces of sheet metal that also needs removal. Then the baffles sit right on top of the heat exchanger which will easily be removed once the sheet metal is removed. then inspect the exchanger.

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How to clean teledyne laars heat exchanger


take off top take off all baffles remove burn rack then rinse out with hose and wire brush to remove soot the best is if you can remove it so you can get to the bottom thats whats sooted up

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My heater sounds like it is backfiring. The sound is like an explosion which emits tremendous sound pressure. Enough to rattle windows. It has been happening for a week now. Didn't realize it was...


There is debri on top of the heat exchanger or the finned tubes on the heat exchanger itself are calcifying or corroding. Remove all leaves,rusty metal, and debri off the top of the heat exchanger and finned tubes, Air has to be able to flow through these tubes freely, any corrision has to be wire brushed off the tubes. then vacuum top of exchanger. reinstall heater top.

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We need to change the heat exchanger for my Goodman Heat Furnace model no.-GMP 075-3


Not an easy task! Take many pictures as well as draw out and mark which wire went where. You will have to remove everything from inside the cabinet to get to the heat exchanger. It may be easier to replace the furnace. If you are paying a professional to do the exchange, figure three hours if they have done it before, if not figure 5 to 6.

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Water coming out of heating element. How to fix?


If it is coming out of the heat exchanger you could have a big problem. You want to remove the top of the heater to find exactly where the leak is. If it is pinholes in the exchanger from a salt system or bad chemistry you may need to replace the exchanger. It could also be from a gasket on the sides of the exchanger. Remove the tops and sides of the heater until you find exactly where the leak is.

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1 Answer

Flame drops when blower comes on suspect bad heat exchanger


Are you saying you lose the pilot flame or the main burner flame? A cracked heat exchanger will cause a "venturi effect" when the blower cycles on. This effect will cause blower to interfere with combustion air and **** out the pilot, and cause lifting of the main burner flames (also add oxygen to the flames changing their color).

Some of your newer style furnaces will kick the hi limit when they have a crack in the exchanger dropping the flame and bringing the blower on.

If you are pretty confident of a crack I would suggest a water test.....After the furnace has cooled. determine which way will most easily access the heat exchanger through the top (under the a-coil) from the "plenium". or from below by removing the blower with it's housing.

once you have determined your approach get a bug sprayer and put water in it. With the heat exchanger cool, use the wand of the sprayer to liberally spray the top of the exchanger. If there is a crack the water will find its way into it. Take a flashlight and look into the bottom of each burner slot, if you see water, you have a crack, shut it down and replace it.

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2 Answers

Heater leaks water on lower left side (side where gas attaches) towards rear. Do not want to take totally apart to get to leak. Side does not appear to come off.


The heater sides do come off. Your heat exchanger will be what is leaking. Some people (I have never tried) have had them welded at a local radiator shops with some sucess though it is likely the heat exchanger will have several thin areas likely to fail in the near future if you have a leak now.

New heat exchangers are expensive. If you would like a quote, contact us with your heater model and serial number at www.arrowpools.net.

The longer you leave it leaking, the more likely you are to damage other parts down in the bottom of the heater so it is not something you should let sit. If you are going to go without it for a while, close the water off if you have a bypass. Otherwise, consider having the plumbing re-arranged to bypass the heater.

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How to take apart case and back flush heat exchange fins


You do not have to remove the coils. Just carefully lift the top with the motor and set it aside (power off). Spray the outside with a foaming cleaner (Dow bathroom) and flush from inside out.

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1 Answer

Goodman furnace model #GPO 125_4 REV 8 Installed 6/2/2002


Have you measured the temperature in the suppy plenum? Should be 140 to 160 max. If hotter, you have a blockage in the ductwork or vents closed. If within spec, bad circuit board.

Jun 05, 2008 | Goodman GMS90703BXA Heater

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