Welcome! Here are the website rules, as well as some tips for using this forum.
Need to contact us? Visit https://heatinghelp.com/contact-us/.
Click here to Find a Contractor in your area.

Trane xv18 communicating

Options
Brutis
Brutis Member Posts: 3
in THE MAIN WALL

Unit shows no error codes. On stat or indoor or outdoor display. No error history. Unit starts runs for 30ish seconds. All motors, compressor, start. Pressures start to drop than outdoor display blinks like crazy. For 5-10 seconds says soft lockout on outdoor display. Than says standby. 3 minute delay and tries again

diegoClaucia1Claucia

Comments

  • Brutis
    Brutis Member Posts: 3

    Any insight is appreciated. These are usually very easy units to diagnose.

  • EBEBRATT-Ed
    EBEBRATT-Ed Member Posts: 18,228
    edited July 22

    What pressure is dropping? The refrigerant pressure?? Is it low on charge.

    mattmia2
  • 109A_5
    109A_5 Member Posts: 2,480

    I don't see anything in the manual that matches those symptoms. So I would start by verifying the power to the unit is correct and all connections are secure.

    I'm assuming it is an XV18 your other post states XV8, do you have the long model number ?

    National - U.S. Gas Boiler 45+ Years Old
    Steam 300 SQ. FT. - EDR 347
    One Pipe System
  • Brutis
    Brutis Member Posts: 3
    edited July 22

    Refrigerant suction pressure starts to drop. Gets to about 200 psi before unit cuts off... can't confirm as unit doest run long enough but static pressures dont appear low.

  • ratio
    ratio Member Posts: 4,064
    edited July 22

    Check the unit low voltage wiring carefully for shorts, & especially check the contactor for a shorted turn. Sounds like something's dragging the 24 volts down until the microprocessor is starved for electrons. It starts to run, but as soon as it energizes something, the low voltage gets grounded & the transformer is overwhelmed. Find out what that something is.

    mattmia2
  • HeatingHelp.com
    HeatingHelp.com Member, Moderator, Administrator Posts: 166

    @Brutis, welcome to Heating Help! I've merged your duplicate posts into one here to prevent confusion. Thanks.

    Forum Moderator

  • HVACNUT
    HVACNUT Member Posts: 6,863

    Suction pressure was 200 psi?

    mattmia2
  • mattmia2
    mattmia2 Member Posts: 13,482
    edited 2:09AM

    200 psig for 410a is 70 f so that isn't unusual for a system coming down from ambient. what is happening on the discharge side? It sounds more like an electrical/electrical control problem but if the high side is doing something weird that could be a clue. something could be clogged or stuck or it could have noncondensables or something like that.

  • 109A_5
    109A_5 Member Posts: 2,480

    I kind of agree with @ratio but for other reasons. If there are any switching power supplies and/or variable speed motors that run from a switched DC Bus the capacitor(s) could be failing. As loads are activated or the compressor and/or condenser fan load increases at some point the faded power supply capacity causes the behavior seen.

    National - U.S. Gas Boiler 45+ Years Old
    Steam 300 SQ. FT. - EDR 347
    One Pipe System

Categories