15
1058907-W2-J
FAULT DIAGNOSIS
Symptom
Cause/Rectification
1.
Only hot or
cold water
from outlet.
a.
Inlet supplies reversed (hot supply to cold inlet).
Check.
b.
No hot water reaching Thermotap-3. Check.
c.
Check strainers and inlet/outlet fittings for blockage.
d.
Refer symptom
5.
below.
e.
Installation conditions continuously outside operating
parameters: refer to section:
'Specifications'
, and
2.e.
below.
2.
Fluctuating
or reduced
flow rate.
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, refer to symptom
9.b.
below.
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 shuttle/thermostat
assembly if necessary.
3.
No flow from
outlet.
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.
c.
Circlip disengaged from head assembly, Check.
4.
B l e n d
temperature
drift.
Indicates operating conditions changed.
a.
Refer to symptom
2.
above.
b.
Hot supply temperature fluctuation.
c.
Supply pressure fluctuation.
d.
Seal(s) damage or wear. Renew internal 'O' seals.
5.
Hot water in
cold supply or
vice versa.
Indicates checkvalves require maintenance, refer to
MAINTENANCE
.
