17
Version 1, 21 August 2019, 17 of 21
14.0
TROUBLESHOOTING
PROBLEM
CAUSE
RECTIFICATION
Sensor Not Responding
−
Damaged or scratched lens
−
Sensor length to short
−
Lead damaged
−
No power
−
Waving hand too fast
−
Transformer faulty
−
Replace the sensor unit
−
Adjust beam to correct length.
−
Replace connected item.
−
Check power is on
−
Slow down the action in front of the
sensor
−
Replace transformer
False Activation
−
Sensor length too long
−
Reflection from a light source
−
Adjust sensor length to correct length
−
Re-align sensor or shield light source
The desired mixed
water temperature
cannot be obtained, or
valve is difficult to set.
.
−
Hot and cold supplies are fitted to the
wrong connections
−
Thermostatic cartridge contains debris
or is damaged
−
Strainers contain debris
−
Non-return devices are damaged
−
Refit the valve with Hot/Cold supplies fitted to
the correct connections
−
Clean the Cartridge ensuring that all debris is
removed, and components are not damage.
Replace if necessary
−
Clean strainers ensuring debris is removed
−
Check non-return device is not jammed.
Clean it if necessary
−
Check for airlocks in the water supply
When the water is set at
cold, the blended
temperature is too hot
−
Hot & Cold water supply connections
are installed in reverse.
−
Refit the valve with Hot/Cold supplies fitted to
the correct connections
The thermostatic mixing
valve will not shut down
−
The hot to mix temperature differential
is not 10°C or greater
−
Thermostatic cartridge contains debris
or is damaged
−
Non-return devices are damaged
−
Raise hot water temperature
−
Clean the cartridge ensuring that all debris is
not jammed. Clean if necessary
Mix temperature unstable
−
Flow rate below 6 L/min
−
Thermostatic cartridge contains debris
or is damaged
−
Strainers contain debris
−
Non-return devices are damaged
−
Rectify any pressure deterioration
−
Clean the cartridge ensuring that all debris is
removed and components are not damaged.
Replace if necessary
−
Clean strainers ensuring debris is removed
−
Check non-return device is not jammed. Clean
if necessary
Mix temperature
changing over time
−
Inlet conditions (pressure or
temperatures) are fluctuating
−
Strainers contain debris
−
Install suitable pressure control valves to
ensure inlet conditions
−
Clean strainers ensuring debris is removed
Either full hot or cold
flowing from outlet fixture
−
The upper temperature ring is incorrectly
set
−
Hot/Cold water has migrated to another
inlet
−
No flow from Hot and Cold supplies
–
damaged check valves
−
Refer also to fault/symptom 1 & 2
−
Re-set temperature to between 35-46°C as
required
−
Replace faulty check valves
Water is not flowing from
outlet
−
Hot or cold water failure
−
Thermostatic cartridge contains debris
or damage
−
Strainers contain debris
−
Remove aerator and clean then reinstall
−
Restore inlet supplies and check mix
temperature
−
Clean the cartridge ensuring that all debris is
removed and components are not damaged.
Replace if necessary
−
Clean strainers