Tuttnauer Sterilizer Repair – Solving The ‘Add Water’ Error

by: dewi susanti


sterilizer repair

If you do have a Tuttnauer autoclave, probably it has ever indicated an error code instructing you to add water. You may assume that adding water would solve the problem; however, the reservoir might already be full. This further complicates the issue, making it appear too complex for routine sterilizer repair. Fortunately, with a little knowledge of the basic operation of such a device, it is possible to easily resolve such an issue.

Here is a basic outline of the operation of the water reservoir within the most common models of the Tuttnauer autoclave – the E series (includes EZ10 and EZ9). This will give a better understanding of the source of the water error code:


How The Water Reservoir Affects The Water Level Switch


A float can be found within the water reservoir compartment of Tuttnauer autoclave E series models. Moreover, a water level switch is attached to the float. Hence, the movements of such a float would affect the on and off position of the switch. In the ‘off’ position, this switch would turn off the autoclave; whereas in the ‘on’ position, the switch would turn on the autoclave.

In normal working order, the reservoir’s water level would lift the float, which in turn would deflect the switch to the ‘on’ position. This creates an electrical connection that turns on the autoclave. In case, the water level within the reservoir is too low, the float causes the switch to move to the ‘off’ position. At this point, the autoclave would be turned off. It can only be turned on again, by refilling the water reservoir.

At the point at which the water level is too low for the autoclave to turn on, an indicator will alert you to add water. This is normally a light signal on a special display meant for safety purposes. Apparently, the autoclave cannot be turned on unless such an error message is dealt with.

Sterilizer Repair – Solving The Problem

When handling the ‘add water’ error message during sterilizer repair, it is necessary to follow a systematic process to help identify the true cause of the problem. This will avoid any guesswork or worsening the situation.

Firstly, if the water reservoir is evidently full and the float within it is still moving freely, the possible problem area could be the water level switch. In order to be certain of this, you need to run a basic continuity test. This will require removal of the wires and inserting a probe from a continuity tester or meter to each wire. In proper working condition, whenever the float is deflected to the up position, there should be continuity indicated by the meter. When the float is deflected to the down position, there should be an indication of an open circuit on the meter.

In case, the switch does not indicate the appropriate on and off positions, it should be the target for sterilizer repair. This switch is easy to detach using such simple tools as a wrench. It can then be replaced with one in good working order.

Take note that, following any sterilizer repair, you must always perform a test cycle, which will ensure that there are no other faults within the device.

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