Symptoms
Cause
Corrective action
Hot water at the cold taps
a) Operation of check valve is
hindered; Check valve is not
sealing correctly.
b) Check valves not fitted.
- Replace faulty check valve
Fluctuating mixed water
temperature
a) Erratic supply temperatures at
the inlet of the valve.
b) Starvation of the water
supplies at the inlets of the valve.
c) Incorrect commissioning of the
valve.
- Restore inlet conditions within
the limits of the valve.
Erratic flow of water from
the valve
a) Insufficient water supplies
b) Fluctuations in the supply
pressures/temperatures.
c) Adverse effect created by other
draw off points on the system
- Stabilize inlet supply condi-
tions.
No flow of water from the
valve
a) In-line filers blocked.
b) Insufficient supply pressures.
c) Debris obstructing valve
operation.
- Clean filters
- Resore inlet supplies
- Clean debris or scale from
the valve.
Valve shut-off function not
performed when tested
a) Installation not compliant with
instructions.
b) Minimum temperature differ-
ence not reached.
c) Valve mechanism blocked
by dirt.
- Follow installation instructions.
- Increase hot water
temperature.
- Remove dirt/limescale from
the valve.
NOTES
11
