truma 6002 failed!

Discussion in 'Heating and Air-Conditioning' started by bjandlin, Feb 21, 2015.

  1. bjandlin

    bjandlin Funster

    Joined:
    Feb 29, 2012
    Messages:
    172
    Likes Received:
    97
    Location:
    Reading & Surgeres France.
    Good afternoon,
    I'm hoping somebody may be able to offer a few words of direction please.
    My heating has been playing up recently & has now stopped altogether.
    The problem started with the system cycling on & off ie. Fan run, gas valve clicks in, system heats & blows hot air. After a while the gas valve & fan could be heard switching on & off,
    initially this could be overcome by turning the stat up.
    This happened again this morning but even with the stat fully up the system has stopped.
    I have so far removed the combustion fan,which I thought may have siezed but it seems ok & free. If I turn the system on the fan runs & continues for a while after turning off, suggesting that it may be ok.
    I would like to test the stat but have no idea as to which is which terminal where it plugs onto the circuit board.
    If anyone could offer some help I would be very appreciative. It's a bit chilly at this time of year in Reading!
    Thanks,
    Barrie.
     
  2. bungy

    bungy Funster

    Joined:
    Jan 24, 2010
    Messages:
    2,246
    Likes Received:
    4,127
    Location:
    Welsh marches
    have you looked at the main pcb, it has a LED that will falsh an error code?

    Did have a similar thing a year or so ago, solved by cleaning the blower fan out - it was well an truly gunked up!! and it blast air through now - supposed to be cleaned 6 monthly according to truma
     
  3. Lenny HB

    Lenny HB Funster

    Joined:
    Oct 18, 2007
    Messages:
    5,216
    Likes Received:
    5,013
    Location:
    West Sussex
    You could take the stat out at the other end & just short the wires out, heating should then run continually if everything else is OK.
     
  4. bjandlin

    bjandlin Funster

    Joined:
    Feb 29, 2012
    Messages:
    172
    Likes Received:
    97
    Location:
    Reading & Surgeres France.
    Thanks both, no led on pcb i'm afraid,have had the fan out & that's ok.
    Taken stat out & measured across p o t & seems ok.
    Will have to phone Truma on Monday.
     
  5. Lenny HB

    Lenny HB Funster

    Joined:
    Oct 18, 2007
    Messages:
    5,216
    Likes Received:
    5,013
    Location:
    West Sussex
    Not much point they don't talk to you anymore just refer you to their service agents.
     
  6. hilldweller

    hilldweller Funster Life Member

    Joined:
    Dec 5, 2008
    Messages:
    26,417
    Likes Received:
    25,074
    Location:
    Macclesfield
    We often hear they are sensitive to low battery voltage.
     
  7. ubuntu1

    ubuntu1 Read Only Funster

    Joined:
    Feb 13, 2008
    Messages:
    155
    Likes Received:
    44
    Location:
    Derbyshire
  8. bjandlin

    bjandlin Funster

    Joined:
    Feb 29, 2012
    Messages:
    172
    Likes Received:
    97
    Location:
    Reading & Surgeres France.
    Well, despite Lennys misgivings I spoke with
    Truma this morning, problem diagnosed easily to the remote temperature thermistor fitted above the door.
    With this disconnected all fires up & we have masses of heat but no thermostat control.
    Gets like a hot house now!
    I could buy a new Truma part at an exorbitant price but could also buy just the thermistor from Maplin or RS. I wonder if anyone might know the resistance value of one please ?
    Thanks for all your imputs.
    Barrie.
     
    • Like Like x 1
  9. Lenny HB

    Lenny HB Funster

    Joined:
    Oct 18, 2007
    Messages:
    5,216
    Likes Received:
    5,013
    Location:
    West Sussex
    Only going by the response I got when I phoned them in December, you must have caught someone who got out of bed on the right side.
     
  10. JeanLuc

    JeanLuc Funster

    Joined:
    Nov 17, 2008
    Messages:
    2,782
    Likes Received:
    1,857
    Location:
    Warwickshire
    • Like Like x 1
  11. Techno

    Techno Funster Life Member

    Joined:
    Jul 28, 2010
    Messages:
    13,847
    Likes Received:
    14,490
    Location:
    Leeds the one up North
    10k@25C my mate Tony tells me
     
    Last edited: Feb 23, 2015
  12. bjandlin

    bjandlin Funster

    Joined:
    Feb 29, 2012
    Messages:
    172
    Likes Received:
    97
    Location:
    Reading & Surgeres France.
    Thanks Andy, have found the truma part is only £10, so have gone for that,hope that sorts it out.
    Barrie
     
  13. mitzimad

    mitzimad Funster

    Joined:
    Jan 28, 2008
    Messages:
    2,962
    Likes Received:
    3,300
    Location:
    walthamstow east london
    be very wary of shorting out stats nowadays unless your sure its a make and break item with electronics you can do a lot of damage to very expensive pcbs
     
    • Like Like x 1
  14. Techno

    Techno Funster Life Member

    Joined:
    Jul 28, 2010
    Messages:
    13,847
    Likes Received:
    14,490
    Location:
    Leeds the one up North
    I'm pretty certain that shorting the thermistor STOPS the heating. removing it will allow it to run unlimited.Thus no shorting required.
     
  15. tonyidle

    tonyidle Funster

    Joined:
    Aug 6, 2013
    Messages:
    2,865
    Likes Received:
    2,684
    Location:
    Kendal, Cumbria
    I've just repaired mine. The thermistor is a 10K type (it's marked on it) but there's another part of the spec that complicates things. 10K(ohms) is the resistance at 25 degC and the resistance falls as temp rises and rises as temp fall. The variations in response occur either side of 25degC - the variation in resistance either side of 25degC isn't the same for all 10K thermistors. I happened to have a 10K thermistor out of a dead phone battery in my junk box (I keep surprising things) and it works perfectly. You may have to try a few different ones. The one you want will almost certainly be the cheapest and most common one in the range so pick one from one of the electronics suppliers (or eBay) and try it. Just plug the bare thermistor into the two connectors hanging out of your wall & only solder it into the housing once you're happy. The value is by no means critical & I suspect the first you try will work. All you're looking for is it to switch at a comfortable temp for you when the control is somewhere between, say, 4 and 6. Alternatively the Truma part isn't too expensive - around £15 on eBay - though a lot dearer than a simple component.
     
  16. bjandlin

    bjandlin Funster

    Joined:
    Feb 29, 2012
    Messages:
    172
    Likes Received:
    97
    Location:
    Reading & Surgeres France.
    Oh well , back to the drawing board !
    Bought & fitted a new room sensor this morning,still the same, so where now ?
    Both thermistors read 10.2k.
    Maybe the thermostat / switch ? I'm not sure where to probe.
    I don't suppose anyone has a circuit diagram or any suggestions further please ?
    In anticipation, Thanks.
    Barrie.
     
  17. tonyidle

    tonyidle Funster

    Joined:
    Aug 6, 2013
    Messages:
    2,865
    Likes Received:
    2,684
    Location:
    Kendal, Cumbria
    There is no switch - just electronics that compare the control setting to the thermistor output. If disconnecting the thermistor allows the heating to run it's likely (but not certain) that the electronics are OK. That leaves the control that sets the heating level. I could not find a circuit diagram and even the circuit boards are becoming thin on the ground. Whilst I was trying to figure mine out I replaced the thermistor with a 10K pot. I used this to mimic the action of the thermistor so I could prove that the heat control was working.
     
  18. bjandlin

    bjandlin Funster

    Joined:
    Feb 29, 2012
    Messages:
    172
    Likes Received:
    97
    Location:
    Reading & Surgeres France.
    Thanks Tony, I'd drawn the conclusion that maybe that was where the problem is.
    When the problem started (cycling on & off ) it could be overcome by turning the stat up.
    It eventually died altogether. As you say with the room sensor disconnected it runs at full tilt,
    plenty of heat but no regulation.
    I was hoping I might have found a diagram of the multi plug wiring to put a meter on & see
    whats happening.
    Don't like to replace bits willy nilly, not satisfying & too costly.
    Cheers.
    Barrie.
     
  19. bjandlin

    bjandlin Funster

    Joined:
    Feb 29, 2012
    Messages:
    172
    Likes Received:
    97
    Location:
    Reading & Surgeres France.
    Good evening.
    Thought I'd just say thanks to those of you who offered me help & advice.
    I managed to sort it out, the new sensor solved it.
    Not sure why it didn't work first time, I did probe the switch contacts & all seemed ok.
    Maybe a bit of finger trouble on my part. Still working ok now & we have heat.
    Thanks again.
    Barrie.
     
    • Like Like x 2
  20. Eddystone

    Eddystone Funster

    Joined:
    Feb 26, 2012
    Messages:
    205
    Likes Received:
    112
    Thank's for posting an update and glad it has been sorted
     
Loading...

Share This Page