The messages above are given when the machine does not register any or enough water passing the flow meter.

The first thing to check as a user - is the water tank. Is the black magnetic float in the water tank free and able to move up and down? (if you have a Z6 or Z8, there will not be a float as a different system is used - these will more often give the message "fill water tank")

Next, under the tank itself is a small circular valve which can be pushed up (when over a sink ideally) to release water - a good flow of water should escape when doing this. If you have a water filter in the water tank try removing it temporarily, as sometimes a faulty filter can stop the flow of water.

The flow meter may be stuck, grit or debris or sludge from the water tank can get inside and stop the impeller moving. It may help to put hot (not boiling) water in the tank and press rinse a few times, as this can get the flow meter moving again.

Is any water coming out of the front of the machine or into the tray, when rinse is pressed? If there is no sound from the pump, then it may be a dead pump or power board, however if there is a low drone/pump sound, but nothing gets through, it is very likely blocked inside with scale and may need to be disassembled to locate the blockage and successfully clear it.

Sometimes just running a strong solution of 6 Jura descale tablets in 500ml of warm water in the tank and pressing "rinse" will remove/breakdown the blockage, but be aware, that it could create a leak from elsewhere in the fluid system due to the pressure required to shift the blockage.

It is worth mentioning, that there is quite a distance of pipe from the tank to the likely blockage and so to get the descale solution to the point where it is needed would require the water in those pipes to be pushed through past the blockage, which of course is likely not possible.

In the workshop, we would disconnect the pipework as close to the blockage as possible and then pump the solution through, or in some cases replace the blocked component altogether.

Apart from the obvious empty bean container, a Jura coffee machine displaying the message "fill beans" when the bean hopper is full is indicative that insufficient coffee powder has reached the brew unit.

This can be because of a powder  blockage, if you can hear the grinder operating before the brew unit cycles and then says "fill beans" it is possible that the output of the grinder is blocked with fine powder or sometimes a cleaning tablet. You may be able to clear this with a vacuum cleaner, but it may need proper dismantling to remove all the obstruction and clean and recalibrate the grinder blades.

Occasionally, a brewer fault can cause this message, whereby if the brew unit is not returning to its ready position to receive the coffee from the grinder, then the coffee will fall off the back of the brew unit and the machine will believe that no powder was produced, consequently displaying "fill beans".

If you cannot hear the grinder operate before the brewer cycle, it is most likely that the grinder motor has failed or burnt out, or the power pcb that feeds it has blown.

Caffé-Select carry new Jura grinder units in stock for most models. Power boards are harder to diagnose remotely until in the workshop and if / when assessing the machine in the workshop we confirm a faulty board, we would order a new one from Jura at that point.

If your Jura coffee machine is giving the message "empty tray" and you have just emptied the tray, there are a few things you can check.

On machines that have metal tray contacts on the back of the drip tray, you need to ensure ALL dirt, water or coffee oil is cleaned from between the two contacts, as any residue can become moist and conduct the current between the two metal plates giving the "empty tray" message.

If you have been running a lot of hot water or steam directly into the tray, it is possible for the internal contacts to become damp and this may take up to 24hrs to dry out.

If you turn on the Jura machine and the message is gone, but shortly after a rinse or coffee the message re-appears, then it is very possible that there is a leak inside which is finding its way down to the internal contacts.

It is worth noting that Z series and J series Jura machines have a microswitch located just above the waste bin at the front of the machine which tells the machine when the waste bin support is in place - this microswitch can get coffee residue on it and stick in the closed position fooling the machine into thinking that the tray is still there and as a consequence not acknowledging that the tray has been removed for emptying in the course of a clean or de-scale. Spray some WD-40 or contact cleaner onto the microswitch to free it off if possible.

This message is often displayed when first switched on, while the machine heats its thermobloc / thermoblocs (some models have twin thermoblocs) to the correct temperature.

If the correct temperature is not reached within the specified time, the machine will usually return an error 4 or error 2 depending on which machine and which thermobloc, although some models may continue just to display "heating" indefinitely.

The first thing to try in this instance is to turn off the Jura machine at the wall and then after about 2 mins turn it back on again - this allows the cycle to begin again and if the machine was simply too cold to reach temperature the first time it will often get there the second attempt.

If it still comes back with error 2 or error 4 after 3 or 4 attempts, then it is likely that your Jura machine needs to be examined to establish if there is a faulty or damaged component.

If the machine continues to display the machine heating message but does not move on from this, then it is usually because the power to the thermobloc has been cut, often by a blown thermal fused cord. The power supply to the Jura thermoblocs has a fail safe, what is known as a fused cord is fitted in line in the positive and sometimes neutral power feeds to prevent overheating.

In the event of the temperature sensor failing the thermobloc may begin to overheat and those thermal fuses in line in the power feeds, will blow and consequently disconnect power, should excessive temperature be reached.

Once blown, these cords need replacing to restore power and the cause also needs to be established at that point or a repeat may occur, though sometimes they will fail with age. We generally recommend changing both power cords and the temperature sensor at the same time as a faulty sensor will blow the cords and overheating to blow the cords can damage the sensor.

Two types of system are used to tell the machine its tray is fitted. On most Jura machines two metal contacts at the back of the drip tray are used - one will confirm the tray is present, the second on the right only comes into play when power is shorted to it from the first (see "empty tray" above)

If the left tray contact is dirty, or if there is a build up of coffee on the floor at the back of the machine, the tray may be lifted and contact not made (tray missing).

Check the contacts are clean and shine a torch to the back of the machine inside to see if there is any debris on the floor and if so, clean thoroughly.

On some machines the presence of the tray is confirmed by a microswitch near the front opening. Ena machines usually use this method and it is very common for older machines to show "tray missing", because the tray is designed to be "free floating" at the leading edge and as a consequence the weight of a full or filling coffee cup can cantilever down the front of the tray and the microswitch then opens showing "tray missing" 

Sometimes a new tray can help, sometimes customers use a coaster or similar to place under the front of the tray to stop it "drooping".