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Dealing with Common Constant Temperature Water Bath Faults

Author:QINSUN Released in:2023-06 Click:161

Common methods of dealing with constant temperature water bath faults

Common water bath faults are:

(1) The display is normal, the setting is normal, and cannot heat up.

The solution to this fault: connect the power supply, turn on the power switch, adjust the set temperature to be higher than the actual measured temperature and check if the temperature controller has an output indication;

If so, measure if the heater tube has a voltage input. If so, the heating tube is broken and can be replaced. If there is no voltage input to the heater tube, it is mainly a relay failure.

If the temperature controller has no voltage output indication, it is recommended to replace the temperature controller.

(2) The temperature controller displays LLL or 999 (depending on the manufacturer, thethe parameters are different)

The fault is the open temperature sensor shorted or shorted, just replace the sensor.

(3) Temperature is out of control

Relay is broken or sensor is wet


1. Clean the instrument immediately after each use. Empty the water from the water bath, use a brush to gently remove large debris from the water bath and clean the pot. Wipe the interior and exterior surfaces of the water bath with a soft cloth, then dry it with a clean cloth.

2. There should be no water drops on the inside surface of the equipment, and the outside surface of the equipment should be shiny and clean without stains.

3. When the water bath is used, it must be grounded reliably and water cannot overflow into the control box.

4. There should be no water in thee water bath or the water level is lower than the electric heating tube to prevent the electric heating tube from bursting.

5. Perform maintenance inspection of the instrument once a month and complete the maintenance records in time.

Points needing special attention

1. The housing of the enclosure must be properly grounded.

2. Before adding water, do not energize to prevent the heating wire of the electric heating tube from being burned.

3. Do not disassemble the right side differential plate unless necessary for safety reasons.

Maintenance and repair:

1. Turn off the power after use.

2. The inside and outside of the box should always be clean.

3. If you find that the light is not on, first turn off the power, unplug the plug and demonCheck the connector board on the right side. If the fuse or indicator bulb is damaged, you can replace it with the same specification.

4. If the constant temperature control fails, it means the controller sensor is faulty and it can be used after replacement