© Galvin Engineering Pty Ltd
Version 1, 13 November 2023, Page 8 of 13
8.0 TROUBLESHOOTING
PROBLEM CAUSE RECTIFICATION
The desired mixed
water temperature
cannot be obtained.
Hot and cold supplies are fitted to
the wrong connections
Valve contains debris.
Strainers contain debris.
Ensure the valve has the Hot/Cold supplies
fitted to the correct connections.
Clean valve ensuring debris is removed and
components are not damaged.
Clean strainers ensuring debris is removed.
Check non return device is not jammed. Clean
if necessary.
The valve will
not shut down
during testing.
The hot to mix temperature
differential is not high enough.
Sealing seat is damaged or
fouled by debris
Raise hot water temperature.
Replace piston O-rings
Clean seat.
Replace element assembly
Mix temperature
unstable.
Debris is fouling valve.
Flow rate below 4 L/min.
Strainers are fouled.
Systems may be fluctuating
outside valve parameters
Clean the valve ensuring that all debris is
removed and components are not damaged.
Rectify any pressure deterioration.
Clean strainers
Check system pressure; install pressure
control valves to ensure inlet conditions are
within limit
Mix temperature
changing over
time.
Inlet conditions (pressures or
temperatures) are fluctuating,
Strainers contain debris.
Install suitable pressure control valves to
ensure inlet conditions are within range.
Clean strainers ensuring debris is removed.
Either full hot or cold
flowing from the
outlet fixture.
Valve is incorrectly set.
Hot/Cold water has migrated to
other inlet.
Adjust mix temperature between 35 – 48
Degrees Celsius as required.
Replace faulty non-return valves
No flow from the
valve outlet.
Hot or cold water failure.
Strainers are fouled
Valve functioning correctly. Restore inlet
supplies and check mix temperature.
Clean strainer.
Flow rate reduced or
fluctuating
Valve or inlet fittings fouled by
debris.
Dynamic inlet pressures are not
within those recommended limits.
Check valve and inlet fittings for blockages.
Ensure the dynamic inlet pressures are
nominally balanced to within +/- 10%
Mixed water
temperature too
hot or cold.
Valve has been tampered with.
Valve incorrectly set.
Inlet temperatures are not within
specified limits.
Readjust valve to required set temperature.
Readjust valve to required set temperature.
Ensure inlet temperatures are within the
specified limits.
Valve is noisy.
Water velocity above velocity
requirements of AS3500.1.
Reduce water velocity.
