This machine had an obvious issue, see the valve coil in the first photo, its melted. I mention this as its related to the main issue. Which was the machine venting steam from the steam wand, I know this is what its meant to do but I mean it starts venting steam uncontrollably as soon as the steam boiler develops pressure. But this problem only became apparent once I had replaced the melted steam valve and coil.

Obviously the valve was being supplied voltage when it shouldn’t.

Burnt coil on the steam valve solenoid

My first suspect was the switching mechanism. I suspected the switch primarily, for no reason other than they look cheap. And as it turned out this was not a very good reason to look here first. But the switch module may have been a factor as if a switch had been shorting it may have been triggering the micro to open the valve. As picture 3 shows the switches are cheap and the mechanical actuator could cause this issue.

Location of the steam controller unit
Pic 3- Controller module for the steam functions

I tested the switches in the module and on the wand, and they all were working normally. So I now did what I should have done first up, I tested for voltage at the solenoid when the machine was activated. In my defence I could not hear the valve opening when the machine was turned on so I did not suspect this to be the case. But using the old light bulb trick I soon confirmed the valve was being constantly supplied with voltage. This is not normal and will of course lead to steam venting from the wand.

An old incandescent light bulb connected to the steam valve harness demonstrates a continuous 240V is being supplied to the valve

The controlling component that switches the voltage to the solenoid coil is a triac that looks like a transistor that switches high voltage in a TO-92 package, labelled TA-8 located on the triac board which is attached to the lid of the machine. Now I was in no mood to pull the entire triac board out and replace it as it takes time so I took a chance and replaced the triac directly in the board while it was still connected to the machine. I do this a lot and it saves time.
I checked the triac TA8 and I could see a short, so I was confident replacing this component would solve my issue.

TA-8 Removed and ready for the replacement

Finally, you may want to know the Triac specifications (its labelled BJ-102), which I thought is a transistor?, they look common and have a logic sensitive gate, I will list these here later when I can find a data sheet and we will have them for sale here very soon.

Disclosure – more often than not, its the Optocoupler – yep, so be prepared to change both components!

the appropriate optocoupler nicely removed.
New Optocoupler added, yes we stock these.

In summary, replacing the triac took care of the issue and yes it was a lot easier than replacing the entire Triac board and far less expensive. But as noted I always start with the Optocoupler, it’s worth a crack if you can not find the triac.
I’m assuming if you have a 980 venting steam from the wand you are right now very happy, as you have the solution or now you can resign yourself to taking it to the repair shop. Which ever it is, get your triac board or triacs and optocouplers here right now, don’t pay too much for it elsewhere.

Tools required, all the usual stuff but you will need a solder sucker and a soldering iron. Unless you purchase the Triac board.

Please also note, that’s damp machines do also suffer similar problems. Often I’ve repaired a leak and let the machine dry out and this has been enough to solve these types of issues. So repair leaks first and allow the machine time to dry before you rip in.


  • Thank you for the advice. I have a Oracle in the workshop. similar issue.
    I have now fitted a new auto steam wand, but the problem is still there.
    When you lower the wand into its working position, it constantly steams. It does not purge and shut off, waiting for the paddle to be pressed. It just keeps going.

    My though is the Triac board in your pictures above has the same issue.
    I am about to order a bo

  • Thank you so much for all this information. I have the same issue, but I tested the triac and octocouplers, and they are fine. I suspect I have the same issue as Steve above. Any helpful suggestions what for next would be much appriciated!

    • After a bit more trouble shooting I ended up replacing the octocoupler and it fixed the problem! Thank you again so much for sharing this information with the community. I will recommend your business to anyone, and put in and order for some o-ring replacements!

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