Question about Carrier 38BRC048 Air Conditioner

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Carrier Heating furnace

I have in my home a central Air/heater Carrier Model 58RAV095-13116 Series 130. Througout the whole summer, I have been using the aircon and it runs fine. Yesterday I turned on the heater. I noticed that the motor/blower will start and after few seconds the wire inside would glow(this unit is pilotless and does not use matches). I would expect gas to lit afterwards but it won't. The wire glow would simply die down. What must be wrong? I need help.

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  • carriedaway Dec 01, 2008

    I have the exact same problem. Carrier attic, home heater.
    However, I actually had a old "bad" controller board laying around and swapped this and it lit once! but now back to no flames.

    Partitioning between the control board and the gas valve now.

    Info:
    I reset the power.
    I noticed I was getting 14v approx on the gas valve. After I let it sit overnight the valve was at 0v. ( I assume this is that safety lockout-reset thing holding 14v?)

    The last time it worked it was 0v to 24v at the gas valve. 0=Off, 24=ON

    I checked the glow filment, and the amperage was at 3.5, and it got bright orange. An article said sometimes even orange ones don't have the current and won't satisfy the control board. But mine seemed good at 3.5amps when hot. Put an amp meter on one wire to the "hot surface" ingiter/filament.

    But the gas valve isn't getting the 24 to open.and the unit stalls/stops/ LED blinks.....not sure why it hangs up with 14 or 16v at times other times it doesn't, but there's definately not 24v on the gas valve to open it.

    The fact it worked once has me confused.
    1) I assume my wiring and such is ok, as it lit once.
    2) I assume the thermostat is ok as it calls for heat and everything goes thru the cycle up to turning on the Gas valve...and it lit up once.

    I'm looking up control boards, $287. Yikes!!
    Relays are often mentioned to be sticking, and these are common and available at $2.50 each, there's only 3qty relays on the board. Potter & Brumfield Relays on my old board.. I'll try to replace all three.

    Gas Valve.. Could it burn out the new board? Most posts say this is rare.


    Any other suggestions? I'm still confused as there's a bit of programming involved too it seems. timeout, safety lockout, reset?



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Either the gas at the outside valve is off, or the gas valve at the furnace may be off, or the switch on top of the gas valve in the furace may be off. if they are all on, then you may not be getting a call for heat from the stat to the furnace control board. check to see if you are getting a 24 volt signal from the stat to the w terminal and common terminal on the furnace board. if you are then check to see if the voltage is arriving as 24 volts to the wires at the gas valve itself . if it is then the gas valve is possibly bad. if it is not then the board is possibly bad.look for loose or broken connections on the low voltage wiring. most unusual that the board does everything else but send power to the gas valve. you need to zero in on the valve i think and start by turning off power and that should restart the sequence of operation and you can observe it step by step . if you are not getting a call for heat then the stat may be bad be sure you are in heat , fan in auto and temp pushed up to max. if no 24 volts is sent to furnace board white and common low voltage board then stat is bad. remove it if you think its faulty and jumper the white and red wires together on the subbase. that duplicates what the stat normally does. if the furnace lights its the stat. having said that i realize the stat has to be sending a heat signal or the other stuff would'nt start. so..... back to the furnace board. check that 24 volts in from stat and 24 out to valve and that will put you on your problem item. good luck

Posted on Oct 30, 2008

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