High and low temperature chambers are key equipment for simulating temperature environments, and their stable operation is crucial for product quality verification. Mastering fast analysis and troubleshooting methods for common faults can effectively reduce downtime. The following will explain the faults in three categories.

1、 Temperature related faults

Large temperature fluctuations or failure to reach the set value:

Analysis: This is the most common problem. The reasons may be refrigerant leakage or decreased compressor efficiency (unable to cool), damaged heating pipes (unable to heat), or long-term operation leading to insufficient speed of the circulating fan and uneven temperature inside the box.

Exclusion: Firstly, observe whether the pressure gauge is abnormal during the operation of the compressor. If the low pressure is too low, there may be a lack of fluoride; If the compressor does not start, check the circuit and overload protector. For heating issues, use a multimeter to measure the resistance of the heating tube to determine if there is an open circuit. Clean the dust accumulation on the fan blades and motor of the circulating fan to ensure smooth airflow.

2、 System malfunction

Frequent start stop or overheating alarm of compressor:

Analysis: Poor heat dissipation of the condenser is the main cause, such as clogged filter screens with dust and high ambient temperatures. Blockage and lack of oil in the refrigeration system can also cause excessive load on the compressor.

Exclusion: Prioritize checking and cleaning the condenser fins and filter screens to ensure sufficient heat dissipation space around the enclosure (usually greater than 60cm). This is the fastest and most effective preventive maintenance measure.

3、 Auxiliary faults

Condensation or icing inside the box:

Analysis: During low-temperature testing, if the sealing strip of the box door is aging or the door is not tightly closed, and external humid and hot air enters, it will freeze or even "freeze" the door seal near the door gap.

Exclusion: Check the airtightness of the door seal with soapy water, clean the sealing strip, and ensure that the door is tightly closed. If the sealing strip ages, it needs to be replaced in a timely manner.

Quick processing process suggestion:

When a malfunction occurs, please follow the principle of "from the outside to the inside, from the easy to the difficult":

Power off inspection: Safety first, power off before operation.

Observation phenomenon: Record the fault code and specific symptoms (such as no cooling, no heating).

External inspection: Check if the power supply, switches, and setting parameters are correct, clean the filter screen and condenser.

Internal maintenance: If the above steps are ineffective, contact a professional engineer to conduct maintenance on core components such as compressors and circuit boards. Do not disassemble them by yourself to avoid causing greater damage.

Regular preventive maintenance (such as cleaning the filter screen and checking the sealing strip) is an effective method to avoid most malfunctions.