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Bleeding the cartridge filter pump
Too much air in the filtration system reduces water flow and can cause noisy operation or filtration malfunction. Venting is accomplished by turning the vent valve until water begins to escape. After proper venting, the filtration can be turned back on.

Cartridge Filters – Basic Troubleshooting
The main problem with cartridge filtration is insufficient water flow. This can be caused by poor maintenance, mechanical failure and poor wiring. It is necessary to check the cartridge and the entire water circuit in which the filtration is connected.

Checking pressure release valve
The pressure relief valve can cause problems if it is not properly closed or tightened. Recommended procedure includes using a service wrench, gently tightening and checking without water in the hot tub. This will prevent possible leakage or damage.

Checking the jets
Blocked air valves or nozzles can cause the whirlpool's massage function to fail. By cycling on and simple valve or water routing steps, any debris can be removed and proper nozzle function can be restored.

Code E81
Error message E81 occurs when the hot tub control panel fails to connect to the base. Possible causes are a faulty current protector, too great a distance between the panel and the base, or improper pairing. The problem can be solved by testing the RCD, checking the connection and re-pairing the panel to the base.

Code E90
Code E90 indicates insufficient water flow, usually due to a clogged filter or poor water quality. Common causes include dirty water, old filter or low chlorine levels. Changing the cartridge regularly and adjusting the water chemistry helps prevent problems.

Code E91
Error message E91 indicates a problem with the solinator, most commonly due to insufficient salt concentration, calcification or electrode wear. To correct the error, add salt, clean or replace the electrode and ensure that the water temperature does not drop below 10°C. If the problem persists, service intervention may be required.

Codes 91 and 92
Error E91 indicates low salt content, while E92 indicates too high. To achieve the correct concentration, the salt must either be added evenly or reduced by partial water change. The key is to dissolve consistently and check the values against the recommended tables.

High chlorine level in the spa
Too high a chlorine concentration can damage the hot tub - from staining the tub and warping the PVC to degrading the heater or filter pump. Always test the water before adding chlorine, and always blow out and store the hot tub if it is inactive for long periods of time.

High/low pressure in Sand filter Pumps
Pressure problems in the sand filtration can be caused by improper installation, the presence of air bubbles, or contaminated filter media. Low pressure is often related to inadequate system venting, while high pressure indicates the need for backwashing. Proper positioning of the pump below the water level is also important.