16
Symptom
Cause/Rectification
5.
Fluctuating or
reduced flow rate.
Normal function
of mixing valve
when operating
conditions are
unsatisfactory.
a. The inlet/outlet fittings may be restricted : check the inlet/
outlet strainers, refer to
PLANNeD MAINTeNANCe
.
b. The water outlet pressure is low : check the flow rate is
above the stated minimum, refer to
SPeCIFICATION
.
c. Fluctuating flow : make sure that dynamic inlet pressures
are within specification, refer to
SPeCIFICATION
.
d. Fluctuating water temperature : make sure that
inlet temperature differentials are sufficient, refer to
SPeCIFICATION
.
6.
Blend
temperature drift
or temperature
cycling.
a. Refer to symptoms
4
and
5
.
b. Hot water supply temperature fluctuation : check and
rectify.
7.
Maximum blend
temperature
setting too hot or
too cool.
a. Incorrect maximum temperature setting : refer to
COMMISSIONING
.
8.
Water leaking
from the DMV.
Warning!
Isolate mains electricity and water supply.
a. Check that the connections are secure.
b. Seal(s) worn or damaged on the inlet/outlet
connections : obtain service pack and renew all
seals.
c. Internal leakage : unit requires overhaul.
9.
LED’s are
flashing on the
control panel and
the DMV will not
activate.
a. An error has been diagnosed, refer to Self-diagnostic
Errors (following table).
10.
The DMV keeps
switching OFF
before the
completion of the
programmed time
flow period.
a. Blend temperature too hot : Reset the DMV by switching
the power supply to the DMV OFF, then ON.
b. Make sure that the inlet temperatures are within
specification, refer to
SPeCIFICATION
.
If the fault has not been rectified, contact your Local Agent
or Customer Care.