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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What is a two stage furnace?


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RC represents power supply for cooling system.
G represents fan (neutral).
W represents heat system.
Y represents cooling system.
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Try calling 1-800-468-1502.
Their english is "REALLY BAD"!!!

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1 Answer

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1 Answer

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You need a 7 conductor minimum, 8 will suffice.

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The Terminal strip on the thermostat and the terminal board on the furnace should be close to this, and let’s assume you have 2 stages of cooling as well. This is a general rule of thumb for the wiring and their correct place.

R - 24VAC
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1 Answer

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