1. The heating tube does not heat up / heats up insufficiently (core reason: damaged heating element, circuit fault)

First, cut off the power and check the circuit: check whether the power cord and plug are loose/damaged, and whether the circuit breaker and fuse are tripped/melted. If they are damaged, replace them with accessories of the same specification.

Inspect the heating element: Use a multimeter to measure the resistance of the heating tube (or heat pump heating component). If the reading is "infinitely large" (indicating an open circuit), it means the element is damaged and needs to be replaced with a matching model of heating tube/heat pump core component (such as compressor, evaporator).

Check the thermostat: If the thermostat malfunctions (such as setting temperature disorder, unable to trigger heating), first restart the device for resetting. If it is still ineffective, replace it with a thermostat of the same model to ensure normal temperature signal transmission.

2. Frequent tripping of heating circuit (core reasons: overload, leakage, component short circuit)

Prioritize the investigation of electrical leakage: Use a leakage detector to inspect the heating tube and the insulation layer of the circuit. If there is electrical leakage (such as the heating tube shell being charged), replace the damaged heating tube or wrap the insulation layer. At the same time, check whether the grounding circuit is intact (poor grounding can easily trigger leakage protection).

Check load matching: If the heating power exceeds the rated load of the circuit / circuit breaker (e.g. if the original 10A circuit breaker is used, the heating tube power needs to be ≥2200W), a circuit breaker with a higher rated current needs to be replaced (in accordance with circuit safety standards to avoid overload), or reduce the number of heating modules operating simultaneously (e.g. for dual heating tube devices, operate one tube at a time).

Troubleshooting short circuit: check whether the wiring terminal of the heating circuit is loose or adhered. If there is a short circuit point (such as damage to the wire sheath causing contact between the live wire and the neutral wire), it is necessary to reorganize the wiring, wrap insulation, and replace the damaged line if necessary.

3. The heating capacity of the heat pump heating system is reduced (core reason: refrigerant leakage, dirty and blocked heat exchanger)

Check the refrigerant: If the heat pump is slow to heat and the temperature at the air outlet is low, first check the refrigerant pressure gauge. If the pressure is lower than the standard value (such as R32 refrigerant static pressure of about 8-10bar, refer to the equipment manual), it indicates a leak. A leak detector is needed to locate the leak point (commonly found in pipe connections and valves). After repairing the leak, refill the corresponding model of refrigerant.

Cleaning the heat exchanger: If the evaporator and condenser of the heat pump are covered with dust and scale (especially when treating high-humidity wastewater), it will affect the heat transfer efficiency. It is necessary to stop the machine and use a high-pressure water gun (low-pressure mode) to flush the heat exchanger fins, or soak them in a neutral cleaning agent (to avoid corroding the metal). After removing the dirt, dry them and restart the machine.

4. Uneven heating (core reason: poor circulation, partial damage of heating elements)

Solve the circulation problem: If the pressure of the wastewater circulation pump is insufficient and the flow rate is slow, resulting in local overheating of the heating tube (some areas have high temperatures and some have low temperatures), first clean the inlet filter screen of the circulation pump (to avoid impurity blockage). If the pump body is worn, replace the pump blades or seals to ensure that the wastewater flows evenly through the heating area.

Check the local heating elements: If the electric heating tube is not heating locally (such as 1-2 groups of heating tubes failing in multiple groups), use an infrared thermometer to detect the surface temperature of the heating tube, locate the damaged element, and replace it separately to avoid uneven heating due to partial element failure.

5. The temperature cannot be stabilized after heating (core reason: poor temperature control accuracy and load fluctuation)

Calibrate the temperature control system: If the actual temperature deviates significantly from the set value (for example, if the set value is 40℃ but the actual temperature fluctuates between 35-45℃), first calibrate the temperature sensor (compare it with a standard thermometer. If the deviation exceeds ±1℃, adjust the sensor parameters or replace it). At the same time, check the PID parameters (proportional, integral, and derivative) of the temperature controller. If necessary, contact the manufacturer to reset them to improve temperature control accuracy.

Stable water inlet load: If the wastewater inlet flow rate and concentration fluctuate greatly (such as instantaneous influx of high-concentration wastewater, requiring more heat for evaporation), resulting in a sudden drop in heating temperature, it is necessary to install a buffer tank at the inlet end to control the stability of the inlet flow rate (such as through flow meter adjustment), to avoid frequent start-stop of the heating system and temperature fluctuations.