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Propex Hs2000 Blown Air Heater

Discussion in 'Interiors, Seating, Lining' started by DaveyB, 11 Jul 2018 at 16:08.

  1. DaveyB

    DaveyB Senior Member Moderator VIP Member T6 Legend

    I have one of these installed under my van as per another thread, however, since it being installed I have noted that the black control unit (the one with the rotary dials) keeps registering a fault.
    Ultimately the red led light flashes 3 times, which indicates that the battery voltage is either below 10V or above 14.8V.
    From what I could tell the system only seemed to be going into fault after driving.
    Having spoken with a couple of companies at CamperJam this weekend I had a bit of a closer look, and ran some tests.
    By pulling the fuse out of my leisure 12V circuits fuse board, effectively isolating the heater, then running the engine/ stopping it, replacing the fuse, the heater never goes into this Voltage fault mode. Sun is still powering the solar, battery voltage up around 14V, all is fine.
    So conclusion. The heater is seeing the spike created by the intelligent alternator, and isolating itself for safety. The way around this, either drive without the fuse in and just replace it when you get where you are going, or fit an in-line switch in the 12V supply to the heater to isolate it when not in use.
    I have called Propex Leisure in Ringwood Dorset, who make the units to feed this information back to them. They hadn’t got a clue, no doubt don’t understand the vehicles they fit these units to. But I asked them to make a note and add it to their files. Won’t hold my breath.

    So if you have a Propex LPG heater in your T6, you may want to fit an isolating switch (i’m just going to use a standard single unipolar CBE switch - with led to remind me that i’ve not isolated it!). Because it is a pain in the botty trying to clear the fault and takes a lot of messing around, as pulling the fuse at that point doesn’t work.

    Be interested to hear if anyone else with a Propex Heater has found this issue.
    Ads_Essex likes this.
  2. Pauly

    Pauly Senior Member VCDS User Admin Moderator

    Any ideas how long the overvoltage situation occurs for ?
    I’m wondering if you could fit some sort of delayed relay to the heater supply so it doesn’t power up when initially firing up the engine ??
    DaveyB likes this.
  3. Pauly

    Pauly Senior Member VCDS User Admin Moderator

    Actually thinking about it you could wire the supply through a normally closed relay that is triggered by the ignition so every time you turn the key on the relay opens and disconnects the supply
    I assume you don’t want to run the heater while your driving, the only downside would be if you needed to run the engine while camping as if it was cold the heater would be offline while the engine was on ??
    DaveyB likes this.
  4. Pete C

    Pete C Senior Member VIP Member T6 Pro

    I have this heater, but fitted an isolating switch as you describe, as I saw little point having it permanently connected and drawing current all the time.
    Therefore not had any issues like you describe, and we only run it when engine is off.

    DaveyB and Pauly like this.
  5. andys

    andys Senior Member VIP Member T6 Legend

    I don't have one of these but couldn't you fit a voltage regulator in line between the fuse and the heater to handle the spike?

    Edit: Those 2 better suggestions appeared before I finished typing ^
  6. DaveyB

    DaveyB Senior Member Moderator VIP Member T6 Legend

    No idea how long the spike lasts for or when it occurs during the charging cycle. Haven’t bothered trying to datalog it.
  7. DaveyB

    DaveyB Senior Member Moderator VIP Member T6 Legend

    Yes that would be a good way of resolving it as well. Good suggestion.
    I’d not be looking to run the heater at the same time as the engine, and if I tried it would probably go into fault anyway, as the alternator would be kicking in and charging, so the heater would cut out due to the voltage.

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