12
Version 1, 15 June 2020, 12 of 16
11.0
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 6 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 /- 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.
Temperature
adjuster difficult
to move.
−
Adjustment at maximum mix
temperature stops.
−
Valve piston over set.
−
Mixed water is at maximum temperature no higher
mix.
−
Wind adjuster out until set temperature required is
achieved.
Hot water flows
into the cold
water system or
vice versa.
−
Non return valves faulty.
−
Replace non-return valves.
Valve is noisy.
−
Water velocity above velocity
requirements of AS3500.1.2.
−
Reduce water velocity.
