rada DRV40 - Common Fault: High Pitched Noise from DRV40; Diagnosing Noise and Checking Motor

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Stop Valve
Full Bore Isolating Valve
Pressure Reducing Valve
Shower
Thermometer
Cold Water
Hot Water
Mixed Water
Check Valve
Recirculation Pump
Key
Strainer / Filter
Needle Valve
Flow indicator
Safety Valve
Water
Heater
Problem: “High pitched noise from DRV40...”
Water pressure
Make sure supply pressures are balanced.
Check for the following:
• Air locks
• Blocked strainers
• Closed isolator valves
• Check inlet flow rates are within
specified parameters. (See
'Specications'.)
Check motor
Motor may be worn, replace.