Mini II Steam Boiler Overheat [FIXED]
Posted: Sat Feb 04, 2017 5:55 pm
Hello all!
I'm aware this post is going to be similar to the one a few down the list. I've read through all of that and have landed here. I really need some solid advice on where to go next.
I have a 3yr old mini 2 which I normally leave on 24/7.
When I travel, I put it in standby and have had no issues at all. However the other day when I returned home from a 3 day trip, I fired up the machine and the steam boiler overheated! The needle wrapped all the way around to the other side of the gauge. I shut it off, but never did get any warnings or release of the OPV. I thought maybe the gauge was faulty at first, but when I opened the steam valve, it came out with more power than I've ever seen on any machine. So I'm guessing it wasn't the gauge. I reset the machine and tried a few more times with the same result.
I called Clive Coffee (where it was purchased) and was instructed to remove the temp probe from the steam boiler and check and clean for scale buildup. However there wasn't any scale, just a little patina. I did clean up the probe and re-install.
I have since reattached everything and fired the machine up to learn something new. Everything heated up just fine. When the steam boiler reached the point that it should shut off, it continued past like before. However this time, after a few seconds I got a blocking alarm and it shut off. This has never happened before. Lights 19-20-21 were lit (Solid). Which I know according to the manual- Steam Boiler Temperature Detection System Failure. This blocking alarm occurs when the temperature probe of the boiler is in short circuit (temperature >145°C) or it is in open circuit (disconnected) condition (temperature <60°C).
I've also tested the temp probe with a multimeter and the resistance was high. Much higher than when I metered the probe on the brew boiler (however I did not remove the brew probe during testing). During testing, I applied heat to the disconnected steam probe (open flame), the resistance fell. Would that mean it's working correctly?
I've also checked the Safety Thermostat, there seems to be continuity through that. Tell me if I'm wrong, but if my understanding is correct, if it were faulty there would be none.
So where would you guys recommend I go from here? Thanks in advance!
I've included a picture of the top of my boiler in case anyone cares to see it. Temp probe is currently removed.
I'm aware this post is going to be similar to the one a few down the list. I've read through all of that and have landed here. I really need some solid advice on where to go next.
I have a 3yr old mini 2 which I normally leave on 24/7.
When I travel, I put it in standby and have had no issues at all. However the other day when I returned home from a 3 day trip, I fired up the machine and the steam boiler overheated! The needle wrapped all the way around to the other side of the gauge. I shut it off, but never did get any warnings or release of the OPV. I thought maybe the gauge was faulty at first, but when I opened the steam valve, it came out with more power than I've ever seen on any machine. So I'm guessing it wasn't the gauge. I reset the machine and tried a few more times with the same result.
I called Clive Coffee (where it was purchased) and was instructed to remove the temp probe from the steam boiler and check and clean for scale buildup. However there wasn't any scale, just a little patina. I did clean up the probe and re-install.
I have since reattached everything and fired the machine up to learn something new. Everything heated up just fine. When the steam boiler reached the point that it should shut off, it continued past like before. However this time, after a few seconds I got a blocking alarm and it shut off. This has never happened before. Lights 19-20-21 were lit (Solid). Which I know according to the manual- Steam Boiler Temperature Detection System Failure. This blocking alarm occurs when the temperature probe of the boiler is in short circuit (temperature >145°C) or it is in open circuit (disconnected) condition (temperature <60°C).
I've also tested the temp probe with a multimeter and the resistance was high. Much higher than when I metered the probe on the brew boiler (however I did not remove the brew probe during testing). During testing, I applied heat to the disconnected steam probe (open flame), the resistance fell. Would that mean it's working correctly?
I've also checked the Safety Thermostat, there seems to be continuity through that. Tell me if I'm wrong, but if my understanding is correct, if it were faulty there would be none.
So where would you guys recommend I go from here? Thanks in advance!
I've included a picture of the top of my boiler in case anyone cares to see it. Temp probe is currently removed.