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Carrier Furnace 58gs075-1 Circuit board issues...

I have 120v into board, 24 volts out to the limit switch however, nothing to the gas valve or ignitor. Ignitor is new, pilot is new and electrode wires. I would greatly appreciate any help.

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  • heatguy May 11, 2010

    you should not have 24 volts at limit switch if you have 24 volts at switch it is open

  • Don Berry May 11, 2010

    I believe that this furnace is electronic spark ignition. However this model number could be either natural draft or induced draft. Can you verify if it has a small motor around the burner area?

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I cant see your wire diagram but trace the circut your talking about. I believe it usually goes through a series of safety switches. Put your VOM across each individual switch. If you get 24 out from the board the first 1 you check and get 24v is open and not feeding back to the board is out. FIND out why. the switch could be bad but it may be indicating a more involved problem, just look aroeund for chared wires or tell tell signes of flame roll out or if its an open (fuse link) suspect what can cause an over heat condition anythign from a bad board or too long an off cycle before the indoor fan comes on ect. PONIT IS Once you come across the cause may not be the reason.
Please grade me accordingly and if you need more I need more info from you. 

Posted on Mar 02, 2009

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1 Answer

Could a limiter circuit interupt the transformer from getting 24 volts to open the furnace valve?


Transformers typically supply 24v to the circut board, controls, and safety switches. 120v supplies the fan motor. limit switch is a safety switch and is part of the startup/ignition sequence. If the limit switch is tripped then there is a problem with your furnace that should be managed by a qualified professional in your area, or risk damaging your furnace, and perhaps causing a fire. Hope this clears things up.

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Yes. There could be a couple of high limit safety devises in the circuit that can open the circuit to the gas valve. Pending your furnace type If your thermostat is calling for heat and the furnace tries to start your transformer is working. High limit safety controls are normally closed. If you have a open limit switch you will not have any continuity through it using an ohm meter or if you test it with a volt meter you will have 24 volts across the terminals of the safety devise. Other problems can be pressure switches, hot surface igniters and control boards. most newer furnaces have a control board that will flash a light code to help trouble shoot the system. Count the flash pattern and look on one of the furnace doors for the flash code directory.

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