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Our central heating controls have stopped working. Sunvic select 107XL. No red lights each side even when it is set on 'on' (ie continuous) instead of auto. It still has power; and to try to sort it I pressed 're-set' and it went to 2 PU; and then I reprogrammed it to try to start from scratch; but still no joy. It's about one year old. The same thing did happen about 2 months ago and it then sorted itself within an hour or two, I don't know how. What could it be? in the meantime, no heat (but boiler is working fine for hot water)

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Thermostats are just switches, Kind of like a light switch, you turn it on and the light lights, you turn it off and the light goes off.
Thermostats turn them self's on and off, you set the tempature that you want and you set the mode that you want. If it turns on and off by it self then it's working.
Thermostats can't turn on and off both at the same tempature, if you set a thermostat to 70 degrees it may come on at 69 and go off at 71 or vice versa depending on if your heating or cooling.
Thermostats are not all the same,
If you set the thermostat to a comfortable tempature and it keeps you comfortable some what with out you having to jack it up and down then it's working. Thermometers on thermostats are not all that accurate as well as thermostat tempature settings are not all that accurate.

Posted on Mar 07, 2009

  • 1 more comment 
  • mohammed marika thambi
    mohammed marika thambi Mar 07, 2009



  • If you replace only
    the condenser, you have a "field-matched" system that can be less
    efficient than advertised and that may require more repairs because of
    undetected incompatibilities between the two.



  • Damper-zoned
    cooling. A large or multistory house is often divided into several
    heating and cooling zones to improve temperature control. However, this
    type of system is complex and has many more moving parts and controls
    and so may require more repairs.


  • mohammed marika thambi
    mohammed marika thambi Mar 07, 2009

    Turning off the power to the furnace will allow the control to clear
    the lockout. When you turn the power back on it should be cleared. If
    you do this and the reset button still pops, you will need to call a
    service tech to look at the cause for the resets. Do not continue to
    reset the button as you will end up with a lot of oil in the bottom of
    the heat exchanger and it will cause the tech a lot of grief. If you
    have to call a tech, be sure to tell him exactly how many times you
    have pushed the reset button.



  • mohammed marika thambi
    mohammed marika thambi Mar 07, 2009

    under warrently contact service center is best

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    Its the deinate problem of power cord wire as its getting short internally on the board where it connects to the control board.it needs severe checking with the help of multimeter to resolve the issue.as its not a costly issue but much time consuming and requires a professional technician to repair the power board internally.do not use the unit till it get repaired to avoid the further damage.as because when you on the unit something or other components gets overheated on the board and gets short evry time you on.

    Posted on Mar 07, 2009

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    Check out for the capacitor number C656 ON THE CONTROL ASSEMBLY BOARD.IT MUST BE GETTING SHORT OR TOTALLY BURNT OUT AND NEEDS REPLACEMENT. REPLACE IT TO MAKE THE UNIT PROPER.

    Posted on Mar 07, 2009

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    • 154 Answers

    It seems the heating element is out.

    Posted on Mar 07, 2009

    • crysiszone Mar 07, 2009

      Oh! i mis the last line.. there is some problem in the wireing of the AC.


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