Question about Heating & Cooling
Hi all, I am working on my grandparent's Trane XR80 furnace, and it will only complete one cycle, shuts down, but the inducer keeps running (will not stop unless power is shut off even if I turn the heat off on thermostat) and after the house cools and needs heat again, the furnace does not come on, just the inducer keeps running. Inspection of the pipes for blockage revealed badly rusted out pipes - they had a leaky chimney that let water in the pipes and rusted them out. Do the pipes have to run all the way up the chimney for the furnace to work correctly? Can I rig this up for them somehow in the shorterm? The furnace will work for one cycle, but won't come back on. Is this related to the pipes, or should I try something else? Flame senser and HSI are good - I am thinking pressure switch or inducer motor? If I shut the power off and back on it will always do one cycle and shut down, but that inducer keeps running and the heater doesn't ever come back on. What do you think? Thanks in advance for your help! Mike
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Posted on Jan 02, 2017
SOURCE: i have a gmp100-4 rav
This problem is something that will not be covered in any manual....the board is defective...the relay that runs the inducer is welded together. this gives the inducer power anytime the furnace is energized... or has power...
The only way to fix this will be to replace the control board....the relay that runs this fan is part of the printed circuit board...not to say that the relay could not be replaced, but you would need to find a relay that matched with the same pin configuration, and then unsolder the old one and solder a new one in...
For most people the only fix is to replace the board...
Posted on Sep 20, 2011
This unit is designed to condense, I suspect that the drain is blocked by some debris. Remove the larger hoses from the burner box and inducer motor and blow into them to clear any debris. Plug the end of the hose so you don't force water into either the inducer or burner box. Make sure that there is a vent on the drain just as it leaves the furnace cabinet. This will assist the drain to work properly and not cause the condensation to go up in the pressure switch hose.
Posted on Jan 04, 2010
The flame sensor is not working properly, it is not allowing the ignitor to ignite, and this is making the system shut down, the flame sensor has obtain a build up of carbon, you will need to remove the flame sensor, and take a little piece of sand paper to remove the black carbon from the flame sensor stem, clean until the stem is shinning, replace the flame sensor and turn the furnance back on this will correct the problem.
Posted on Dec 14, 2009
SOURCE: inducer motor runs cont. and
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The relay on the circuit board for the inducer is stuck closed....
The reason you have to turn down the t-stat or recycle the power is that for the system to refire the pressure switch must open and then close again, which it does in either of those cases....
To fix the problem you will need to repplace the circuit board....
Check with your dealer for a new board or you can buy it on the internet...
How to find Air Conditioning, Heating and Furnace parts online.
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Posted on Nov 12, 2010
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