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Thread: Jobo CPP2 not heating

  1. #1

    Join Date
    Mar 2016
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    Jobo CPP2 not heating

    Hi,

    I have had the above machine for about years without any issues. Recently itís stopped being so unreliable, the thermal overload switch had popped out but that was reset without issues (I presume)

    I mostly use it for b&w but last time I used it for c41 about 2 weeks ago it took ages to get the temperature to respond, after twiddling the dials lots it did get to speed as normal.

    Yesterday the heat settings would not respond at all, the thermal switch has stayed in. I have opened it up and the fuses all appear fine, though Iíll replace the 800ma fuse for the temperature control panel to see if this helps.

    The thermal overload switch does move when pulled and pushed though itís clearly rusty behind, is it worth putting some contact spray on this to aid it?

    Any ideas appreciated!

  2. #2

    Join Date
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    Re: Jobo CPP2 not heating

    I'd double check all the electrical contacts. Years ago had intermittent heating problems with a processor. All the electrical contacts visually looked to be fine, but one of them was not. Cleaned it up and the intermittent problem disappeared.

  3. #3
    Daniel Stone's Avatar
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    Re: Jobo CPP2 not heating

    If you can’t seem to get it to work, pop a sous vide immersion cooker in one of the bottle slots. Cheap, easily found/sourced, and can be dedicated solely to keeping your processor at temperature

  4. #4

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    Mar 2016
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    Re: Jobo CPP2 not heating

    Thanks for the replies, I’ll try the first suggestion and if that doesn’t work go for the second, great tips!

    Thanks.

  5. #5

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    Iowa City, Iowa
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    Re: Jobo CPP2 not heating

    If you run hot tap water over the thermal switch it will pop. I popped mine with maybe 125-130 F tap water. I use a toothpick or a small tool to fully depress, gently, that little breaker to get it reset. I've never fiddled with the breaker, not sure about contact cleaner. I would be gentle, maybe start by gentle cleaning with a toothpick or Qtip and a drop of alcohol (not with any added glycerin etc) I have a small bottle of ancient Kodak movie film cleaner, cfc113 and heptane. Tremendous solvent /cleaner also banned.

  6. #6

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    Re: Jobo CPP2 not heating

    Quote Originally Posted by Duolab123 View Post
    If you run hot tap water over the thermal switch it will pop. I popped mine with maybe 125-130 F tap water. I use a toothpick or a small tool to fully depress, gently, that little breaker to get it reset. I've never fiddled with the breaker, not sure about contact cleaner. I would be gentle, maybe start by gentle cleaning with a toothpick or Qtip and a drop of alcohol (not with any added glycerin etc) I have a small bottle of ancient Kodak movie film cleaner, cfc113 and heptane. Tremendous solvent /cleaner also banned.
    Thanks for the information, just so Iím clear, should I remove the thermal switch from the machine before running it under a hot tap? Or does it only function if the machine is powered up? Iím hoping the former!

    Thanks.

  7. #7

    Join Date
    Mar 2016
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    105

    Re: Jobo CPP2 not heating

    Just to update, I changed the fuse and put contact spray on the connectors. The thermal cutoff switch was moving freely so I left it alone. After putting it back together it is very slowly getting up to temperature but it’s really too slow, it’s taken 3 hours to rise 3*C

    Does anyone know if there’s a way to speed up the heater element?!

    I suppose if it maintains a temperature of say 38*C then it would be fine, just a case of mixing the water as close as possible prior to processing. It would be a pain though if I have b&w and then colour to process as I’d need to dump the 20*C temp water for fresh hotter water.

    Any info on the heater would be great, thanks.

  8. #8

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    Re: Jobo CPP2 not heating

    I'd also take a look at the heating element and see if it might be covered in calcium. no idea if this would be a cause for really slow heating though. If you need to heat things up quickly, I'd just add hot water to the reservoir.
    notch codes ? I only use one film...

  9. #9

    Join Date
    Dec 2014
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    Iowa City, Iowa
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    Re: Jobo CPP2 not heating

    Quote Originally Posted by DannyTreacy View Post
    Just to update, I changed the fuse and put contact spray on the connectors. The thermal cutoff switch was moving freely so I left it alone. After putting it back together it is very slowly getting up to temperature but itís really too slow, itís taken 3 hours to rise 3*C

    Does anyone know if thereís a way to speed up the heater element?!

    I suppose if it maintains a temperature of say 38*C then it would be fine, just a case of mixing the water as close as possible prior to processing. It would be a pain though if I have b&w and then colour to process as Iíd need to dump the 20*C temp water for fresh hotter water.

    Any info on the heater would be great, thanks.
    Call Omer Hecht @ CatLABS. He's official service for Jobo. There's several things that it could be. The heater connections could be dirty, the heater could be defective, etc. He takes older units on trade

  10. #10

    Join Date
    Mar 2016
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    105

    Re: Jobo CPP2 not heating

    Quote Originally Posted by Duolab123 View Post
    Call Omer Hecht @ CatLABS. He's official service for Jobo. There's several things that it could be. The heater connections could be dirty, the heater could be defective, etc. He takes older units on trade
    Thanks for the tip, I’m based in the U.K. but hopefully I could get some advice from him at least.

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