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Thread: help with "fault"

  1. #1
    Automated Home Lurker
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    Mar 2005
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    Bingley, West Yorkshire
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    Default help with "fault"

    Good grief, there's a forum for everything!

    Right, I hope someone out there can help me. We have a heating controller that runs a domestic Indux ducted MVHR and heat exchange system. According to the controller, we have 4 temperature sensors - 3 internal and 1 external. Since a thunderstorm last year, the controller keeps flashing up that sensor 4 (the external one) is faulty. In spite of this, the system appears to work and heats our house and circulates the air as it should.

    In all the plans that were left me by the previous owner of the house, there is no indication of where this external sensor is. We have had service engineers out to service the heating system but they could not clear the fault nor find the sensor. The engineer has had a look over the outside of the house and also in the air intake ducting (which is where he would expect to find the sensor). So there may not even be an external sensor fitted; the controller just thinks there is.

    Surprisingly, there is no indication of who manufacturer of the control unit is - it just says "802 controller" on the front panel and the photocopied instruction book for the controller also has no manufacturer details.

    This instruction book doesn't give any indication of how to clear the fault message, either.

    So, is this controller unit familiar to anyone? If so, would someone be kind enough to tell me how to clear the fault? And, if anyone has any experience of these things, where should I look for an external sensor, if one exists?

    Thanks in advance.

    Russ

  2. #2
    Automated Home Legend TimH's Avatar
    Join Date
    Feb 2004
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    UK
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    Default Re: help with "fault"

    I'm not familiar with the controller but have a few suggestions which may help, or may have already been tried by your service techs.

    Firstly, have you contacted the previous owner of the house? They may remember who installed it, where the sensors may be etc.

    Is your service tech familiar with the unit itself, or is he troubleshooting from the manual only?

    How are the sensors wired into the controller? Can you try swapping one of the working sensors onto the terminals for the external sensor? Are there even wires connected for the external sensor ? If there are wires connected can your troubleshoot the fault with the external one? and what type of sensors are they? (resistance/milli-amp/voltage etc.)

    As to where is the external sensor may be located, I'd look somewhere near the air inlet in a sheltered place. Some temp sensors can be very small and therefore real easy to hide - great for not looking at, very difficult to spot if you don't know where precisely to look

    Final option is to lift some floorboards etc. and trace the actual wire run. If you get to this stage, I think I might just abandon the existing one, *if* it exists, and just wire in a brand new one instead.

    HTH,

    Tim.

  3. #3
    Automated Home Lurker
    Join Date
    Mar 2005
    Location
    Bingley, West Yorkshire
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    Default Re: help with "fault"

    Thanks Tim. I'll pass your comments on to the service guy.

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