If you are experiencing problems maintaining a stable temperature in the main bath of the ML176 Langendorff Apparatus, this is commonly caused by a faulty temperature sensor.
You will need to acquire a new temperature sensor (Part No. - SP3774) which can easily be replaced by following the attached instructions.
The unit should then be tested by monitoring the temperature to ensure it is maintained at the desired level. Temperature issues may also indicate problems with the thermostat controller, heating element, or the water level indicator.