21
FAULT DIAGNOSIS
Symptom
Cause/Rectification
Normal function of thermostatic control when operating
conditions are unsatisfactory;
a.
Check strainers and inlet/outlet fittings for flow restriction.
b.
Make sure that minimum flow rate is sufficient for supply
conditions.
c.
Make sure that dynamic inlet pressures are nominally
balanced and sufficient.
d.
Make sure that inlet temperature differentials are sufficient.
e.
(Subsequent to rectification of supply conditions) Check
thermostatic performance; renew Thermostatic cartridge, if
necessary.
2.
Fluctuating
or reduced
flow rate.
3.
No flow
from shower
control
outlet.
4.
Blend
temperature
drift.
Indicates operating conditions changed.
a.
Refer to symptom
2.
above.
b.
Hot supply temperature fluctuation.
c.
Supply pressure fluctuation.
a.
Check strainers and inlet/outlet fittings for blockage.
b.
Hot or cold supply failure; thermostat holding correct
shutdown function: rectify, and refer to symptom
2.e.
above.
a.
Inlet supplies reversed (hot supply to cold inlet). Check.
b.
No hot water reaching shower control. Check.
c.
Check strainers and inlet/outlet fittings for blockage.
d
. Refer symptom
5
below.
e.
Installation conditions continuously outside operating
parameters: refer to
SPECIFICATION
, and
2e
below.
1.
Only hot or
cold water
from outlet.
5.
Hot water in
cold supply
or vice
versa.
Indicates checkvalves require maintenance, refer to
MAINTENANCE
.
6.
Maximum
blend
temperature
setting too
hot or too
cool.
a.
Indicates incorrect
maximum temperature
setting;
refer
to
COMMISSIONING
.
b.
As symptom
4.
above.
c.
As symptom
5.
above.