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  • Convotherm gas combi oven dilemmas

     olivero updated 1 month ago 3 Members · 13 Posts
  • Goonie

    October 21, 2020 at 9:11 am

    New here and stumped. I run maintenance at an oil site and in the kitchen there is a newer convotherm oven thats doing my head in. It is less than 18 months old and has started throwing a gas fault.. this fault however is mentioned once in the manual and it’s suggestion is to open the gas valve and fire unit… why didn’t I think of that? Lol

    The problem is, I’m never around when its happening repeatedly. I finally managed to get the fault once. So I turned off the unit. Switched the gas valve OFF and tried again. Same fault would you believe it! Only it took 5 minutes longer than the initial attempt with gas valve open.. 🤔

    So I pull the panel off to investigate.. all looks good. Try start up procedure.. success. Again and again and again. Success. Making me think its a combustion air issue. So I put the panel back on. Start up procedure.. SUCCESS!!!! WHAT THE F$^K. This is my first time with this unit and I’m lost. I cant trouble shoot the unit when it’s working. Anyone have any ideas?

    Its a convotherm c4et 20.20 gs on propane supply.

    Fault code is E05.3.1.0. NO GAS..

    There is gas. Arrrrgghh

  • fixbear

    October 21, 2020 at 9:55 am

    Does it have a quick coupling on it? If so, make sure it is fully locked in.

    Take your Manometer and monitor the manifold pressure to be correct.

    Not sure of the system here, but sizing and other equipment on your supply and the capacity of the regulator and boil off of the tank comes into effect. Anytime one installs a gas appliance, the system has to be recalculated to verify that it has the capacity to support it.

    • Goonie

      October 21, 2020 at 10:59 am

      I tested all the pressures. Its on a drop with a steamer, tilting skillet and a tilting kettle. All well below the capacity of the pipe feeding them. This happens when bone of the other appliances are running

      • olivero

        October 21, 2020 at 11:02 am


        It’s been working for 18 months already, the likelihood of the gas pressure being low all of a sudden is pretty slim.

        If you want to verify what I’m telling ya, pull the burner and look at the igniter, it’s warped, 18 months is pretty good and about what it took before mine had issues right out the box.

        I can walk you through the whole thing if you need it.

  • olivero

    October 21, 2020 at 10:49 am


    The C4, my specialty.

    The E05.3 is just ignition error, then numbers 1-3 indicate where. The .1 indicates top burner if I’m not mistaken.

    It’s going to be an igniter problem I can guarantee it, just replace the igniter and monitoring electrode. This is the part.

    Be preapred to go to hell and back on this thing, I’ve had to do so many repairs on my C4 unit.

    You are going to need metric open end wrenches, a metric socket set and some common tools.

    The igniter has a very, very specific distance it has to from the monitoring electrode and burner, the new part comes with the specific measurements, I probably have them.

    Have you pulled a burner on this unit before?

    OH and DO NOT. NOT> NEVER >EVER turn screws on this thing when it’s hot, the stainless galls and breaks the studs on the heat exchanger flange, then you have to weld them back on or buy a new one.

    I can probably answer most of your questions on this unit, since I’ve worked on mine, a lot.

    • Goonie

      October 21, 2020 at 11:03 am

      Thank you for the guidance. I’ll start there when I get back on shift.. thankfully I managed to leave it operational before I departed for 14 days. But I can’t stop thinking about it and I know it’ll be waiting for me when I return. Feel free to load me up with ideas because as soon as I pooped that panel off and saw more computer parts than i have ever seen in an appliance I just started drooling and stuttering lol

      • olivero

        October 21, 2020 at 11:12 am

        Haha, funny how these things can leave one bothered for so long, I’m the same way.

        I mean, it’s pretty simple, there’s a service menu on the machine that lets you run every component individually and gives you feedback, you can run the top or bottom burner by itself and see the MA signal coming back and the combustion blowers RPM’s measured at the board.

        Fans, lights, pumps, everything. About the only good thing on this unit in my opinion.

        I would also look for cracks in the heat exchanger, I had one crack and it was causing odd problems, noticed it when I pulled a burner after a cleaning cycle on a hunch and it was wet, figured the water caused some shorting issues for the spark and that’s why it messed up.

        welded the crack shut and the problem went away.

        The burner is a nightmare to pull, it’s all fancy clips that fit here and there and angled in and then screwed in, I recommend having another person there to help hold things so you can line up holes and stuff. Or use your head, I do that too.

        I have a word document from when I had to weld the cracks in the wall of the oven with the pictures from doing the repair on the unit, might shed some insight on how it’s all put together.

        I have the service manuals, repair manuals, parts manuals, all of it, I’ll send it to you.

  • olivero

    October 21, 2020 at 10:54 am

    Found some pictures, here’s an igniter after some months of use.

    The igniter is spark ignition, so distancing is crucial, over time this happens and so that crucial distance is changed and it starts to be intermittent.

    The service menu is very, very useful, I’m not sure if you are using it, but it will give you the MA reading back from the burner which makes it easy to see what’s happening. Do you have the password? if not, PM me and I’ll give it to you.

  • olivero

    October 21, 2020 at 10:56 am

    You have the exact same unit I have except mine is natural gas.

  • Goonie

    October 21, 2020 at 11:07 am

    I have no passwords for anything with this thing. Typical camp appliance. No manual. Nothing. I managed to find the basics but beyond that I’m at a loss. Especially when I try to troubleshoot it and it works fine for multiple cycles and varying temps for a 5 hr period. Then I find out the next day it died again. I will reach out to you before I go back on shift and get any information you can give me. If that’s OK id be in your debt

    • olivero

      October 21, 2020 at 11:16 am

      They CAN be an absolute nightmare, just go into this slowly, I don’t know what you know how to do, so you’ll have to give me an honest idea of your skill level.

      A lot of things can go wrong if you aren’t careful or don’t know what you are doing.

  • Goonie

    October 21, 2020 at 11:22 am

    Typical gas appliance repairs, boilers water heaters, furnaces, stoves, fryers, broilers etc. This is my first encounter with a digitally controlled unit. As I said. I popped that panel off and just went. Fuck… lol. Its on the scope so I need to learn it. Thats why I’m here. And I’m grateful for the positive input

    • olivero

      October 21, 2020 at 1:49 pm

      Well, great then,

      With a little bit of guidance, you should become fairly compotent on combi’s in no time.

      They are really not that complicated once you get a couple of things set straight, they do seem overwhelming at first.

      I PM’ed you.

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