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York Air Handler trips main circuit breaker

A 10 year old York Air Handler is trpping the main circuit after running in heat mode for a short period of time.

Something is causing the unit to drawing more current then normal.

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  • ptansill Nov 23, 2008

    Yes, it is.

    Testing: I'm running the Air Handler fan only

    to determine if the Blower is having an issues.

    I am going to monitor the current draw for the blower.

    The AH has been tripping the main circuit during Heat mode

    This unit has 2 electrical heating coils.

    I'm searching for proper max current draw to determine if the 50amp breaker is suffiecent.

    This is what has been in there for years without any problems.

  • ptansill Nov 23, 2008


    I checked the heating coil and the resistance in each are the same 19 Ohms.

    What do you know about the Time Delay Relay and Sequencers. I believe that the problem is associate with One of the Two.

  • ptansill Nov 24, 2008


    I should have mentioned this earlier.

    I put a new 50amp circuit breaker and only one phase leg get hot very hot about 2 to 3minutes in the heat mode.

    Can the phase post in the electrical panel have some corrosion or siot that would create a resistive path that would heatup?

    The reason I mention this is that the wire does not seem hot.

    What if the second sequenizer doesn't do its thing?

    Note: The fan runs continuiously.

  • Ken Bledsoe May 11, 2010

    Is this a electric furnace?


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Almost has to be the electric heat strip coils. they usually come on in stages. when the damaged strip comes on it kicks breaker. turn off all power, check with a meter , gently remove strips and inspect for broken or shorted coils. usually best to buy a new heat strip module. they are usually held in place as a module with 4 screws and a snap together wire connector .good luck. i have had some success if the wires are broken and not to brittle by bending a minute loop in the end of each wire and reconnect with the tiniest screw and washer and nut you can find, i'm talking real tiny. about the size of a bb if you can find em , or you can remove the damaged strip wire entirely to get some heat from remaining.

Posted on Nov 23, 2008

  • Karen Duncan Nov 23, 2008

    the sequencer acts as a time delay generally the first strip and the fan come on and off together. then 90 seconds later the second strip kicks in. each 5 kw strip pulls about 20 amps of electric. so sequence should be call for heat , sequencer warms up and bimetal disc snaps closed and energizes stage one and fan at about 22 amps, then a minute or two later second strip kicks in and amps jumps to 42 to 44 amps. . the sequencer could be bad generally a number 33233 or 33234 from white rogers or similar is the part. fan and number one strip go to number one and 2 set of contacts. number two strip goes to 3rd set of contacts. test with amp probe to be sure fan stays on till last strip is satisfied. youdon't want any strip on without a fan.

  • Karen Duncan Nov 24, 2008

    YES THE BUSS BAR THE BREAKER CRIMPS ON TO CAN GET coroded and the looser the connection, the higher the amps. try snugging up the wires in the new breaker and move it to a new location in the panel. problem should correct itself. any two new buss bars should do the trick. an electrician can kill power and sometimes clean up the old buss bar . try some no corode on the new breaker female connections. these problems show up a lot this time of year. 2 to 3 amps of fan becomes 45 to 50 in heat. be sure connections are snug where wires enter and connect to airhandler wires. sometimes old wire nuts get loose. they should be snug and nocoroded to. nocorode is a electric grease in a tube. available at elec supply houses and home stores. best way to connect wires to electric strips is split bolts. also at home stores or elec supply house. they connect dissisimilar types of wires and get real snug. then you wrap them with a good roll of electric tape and they last forever, but good wire nuts will work and are commonly found. however of these dozens of failed connections i see 95 percent are wire nuts , especially if you join aluminum and copper. they expand and contract at different rates and that gets loose over time. always best to use split bolts on alum to copper.


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