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The factory temperature setting is low so that they can advertise the machine as 'low energy'. You can increase the temperature by pressing a series of buttons when the machine is in standby. Go to Instruction Manuals to read the required setting.
Evening to you Not hot enough, do you leave it to stand with the green lights on? By my experience the machine is best left on so everything is hot when the water passes through. To let some time pass before you make the next cup. And lasly to make sure that machine is clean. Good luck kolbrun
Depending on the model, if using a manual knob for the tea valve(same kind of setup as the steam) then you will have to turn up the p.stat. If it has an electronic button then remove the front top panel and look on the side of the solenoid you will notice a knob attached to another solenoid called an economiser valve, there should be a plus and minus sign on the knob. Reducing the amount of cold water being mixed with the hot water will increase the temperature.
Check screen and diffuser for blockage, backwash machine. If you still have the noise problem, when runnig the head, then it is block at the solenoid. For the temperature, it is possible that the one of the thermostat is damaged.
Our Bunn VPR was delivering luke warm coffee. The problem was lime scale buildup on the heating element. I recommend using a cleaner such as Brew Rite or a vinegar solution. If it still does not heat properly, unplug and remove the heating element for cleaning. This corrected our problem.
Hi , if you could open the below cover check the heating sensor might lose connection / if their is possibility to unscrew the sensor try to applied heat sink grease available in appliances repair shop , make clearance to boiling tank thick two papers in applying sink grease,same in warming surface.