Aqualisa 669908 Thermostatic Cartridge for Concealed Siren Shower Mixer Valves

Summary

Aqualisa 669908 is a thermostatic cartridge assembly for Aqualisa Siren thermostatic shower mixer valves. It is used inside the valve body to regulate the mixed water temperature and help maintain stable showering temperature from the hot and cold supplies.

This cartridge is suited to verified Aqualisa Siren concealed, recessed and exposed mixer shower valve applications. Check the valve model, trim style and existing cartridge code before ordering, especially where the shower has been serviced previously or where exposed and concealed Siren parts are being compared.

Technical Details

Typical Fault Symptoms

• Shower temperature fluctuates or is difficult to control
• Shower does not maintain the selected mixed temperature
• Shower runs too hot or too cold even when the supplies are correct
• Temperature control becomes stiff or unreliable after scale build-up or cartridge wear

Confirmed Compatible Models

• Aqualisa Siren concealed valve only 669904
• Aqualisa Siren Exposed Shower Valve - Chrome SRN001EA
• Aqualisa SRN001CA Siren Concealed Mixer Shower with Adjustable Head Spare Parts

Before Ordering Check

• Match the existing cartridge code 669908 where visible
• Confirm the shower is from the Aqualisa Siren thermostatic mixer valve range
• Check whether the valve is concealed, recessed or exposed before ordering surrounding trim parts
• Flush the pipework and clean inlet filters during servicing because debris can reduce flow and affect cartridge performance
• Use silicone grease on suitable cartridge O-rings during fitting and avoid petroleum-based lubricants

Related Spares You May Need

• Triton 83312940 Thermostatic Cartridge for Elina Sequential Shower Valves
• TACSIL 3g Premium Cartridge Silicone Grease - WRAS Approved
• Aqualisa Siren Range Control Knob Lever Only
• Aqualisa Asp/Srn Exposed Elbow Cover Plates Pair
• Aqualisa Asp/Srn Check Valves Pair
• Aqualisa Asp/Srn Exposed Outlet Flow Regulator & Housing
• Aqualisa Asp/Srn Concealed Mounting Plate
• Aqualisa Asp/Srn Concealed Wallplate Chrome Plated
• Aqualisa Asp/Srn Concealed Inlet Elbow Assembly Pair
• Aqualisa Asp/Srn Concealed Valve Outlet Assembly
• Aqualisa Asp/Srn Concealed Inlet Filters/Washers
• 150mm Universal Shower Hose - NXT734

Installation Note

Isolate the hot and cold water supplies before removing the old cartridge. After fitting, restore the supplies gradually, check for leaks, confirm correct hot and cold orientation, then test the temperature control through its full movement before putting the shower back into use.