Question about Goodman GMS90703BXA Heater

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Goodman heating system -gmt1155b is not providing enough heat.

This heating system must have two heating stages. It is only heating ,and giving out warm air .It's not going into the higher heating stage. filter is clean ,returns are cleared. What can I do to get it hotter?

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  • Lou Barta May 11, 2010

    If you have two stages..second stage might not be hooked up. Check the main circuit board. Look for the thermostat terminals... Is there a W1 & a W2. if so, it is a two stage. Is there a wire connected to both terminals? if not, second stage is not connected. Do you have a two stage thermostat?

  • Dennis Boxerman May 11, 2010

    Are you sure this is a 2 stage heating system? If so, is the t'stat one that can be wired for this? Have you actually checked the temp of the air being blown out of the unit?

  • Barry Davis
    Barry Davis Nov 01, 2012

    our goodmans gas furnace will only run for 5 minutes then quits

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If you are using a single stage with just a W connection not a W1 and W2 then it may be wired to the W1 connection on the furnace contro board. in that case it will only run in first stage. the easiest thing you can do is run a small piece of wire between W1 and W2 on the furnace control board. if you dont have a W1 and W2 connection on the board then its not 2stage, if you have an extra wire at the stat you can get a 2stage stat and wire W1 and W2 individually.

Posted on Sep 18, 2009

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Need help getting additional info for this system...


1-888-593-998eight. Goodman tech support. You should have your model# & serial# to both indoor/outdoor units if needed.

mobile.goodmanmfg.com/mobileapp/index.jsp#/mobileapp/asap/newPMainAction.jsp

This link gives a lot of info but not what you are looking for I believe. Most 2 stage equipment will have a Y1 and Y2 at the terminal block inside the air handler. And a two stage cool, two stage heat would work for yours, it appears to be a heat pump. Now at the outdoor unit, if it is 2 stage, you should also see Y1/Y2 terminals. As far as a filter media? Hard to say.

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A heat pump on the optimal heating day (about 50 degrees ambient) will only deliver approximately 85 degree air as compared to 125 degree air from a fossil fueled furnace. The colder the outdoor air is the less heat there is available to be transferred to the living space. At 30 degrees, the heat transfer capability is getting close to negligible meaning the run cycles will be approaching continuous and eventually as the heat pump along cannot maintain setpoint, the outdoor stat or stats will bring on auxilliary heat in the air handler.

If your ambient temp is below the 'balance point' of the heat pump, the house temp will drop a little lower and most times energize the heat strips through the outdoor t-stat. Your outdoor stat could be set too low for the heat pump to carry the structure all the way down to the balance point so when you turn it off and back on, the lower indoor temp automatically brings on the heat pump plus a heat strip or two, thus the warmer air. Second stage on the stat satisfies due to the heat strip, drops them out of the circuit and the heat pump is left running on first stage heat delivering the perceived cold air.

Your outdoor stat could also be not functioning correctly and not allowing the heaters to come on until the system is turned back on reestablishing the two stage call for heat.

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W1 and W2 are the differences from the single stage to the two stage. Im thinking its your thermostat is not programed for 1 heat / 1 cool. You probably had 2 heat / 1 cool before.

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the thermostat sub base has a place to connect a wire usually white to energize the heat strips when you push the stat way hotter than the house temp. that is why the strips come on in normal heat. it also has a terminal that is only energized in emergency heat and it also should have a wire connected to it so that terminal can supply power to the strips when the stat is switched into emerg heat . you can identify the terminal from the wiring diagram and if need be jumper w2 wire over to the aux terminal and it will work. they both go back into the airhandler and power the same strips. w2..................................................................................................w2 in airhandler to strips or w2...jumper to aux......................................................................................................................w2 in airhandler to strips.

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