18
1095640-W2-B
FAULT DIAGNOSIS
Read the section:
Important Safety Information
first.
Provided that the Thermostatic Mixing Valve has been correctly installed and is
operated in accordance with the instructions contained in this guide, difficulties should
not arise. If any maintenance is required then it must be carried out by a competent
tradesperson for whom the fault diagnosis chart and maintenance instructions are
provided. Before replacing any parts make sure that the underlying cause of the
malfunction has been identified.
Symptom
Cause / Rectification
1.
Only hot or cold
water from the
outlet.
a.
Inlet supplies reversed (i.e. hot supply to cold inlet). Check.
b.
No hot water reaching mixing valve. Check.
c.
Check strainers and inlet/outlet fittings for blockage.
d.
Refer to symptom 5, below.
e.
Installation conditions continuously outside operating parameters: refer
to symptom 2e and section:
‘Specifications’
.
2.
Fluctuating or
reduced flow
rate.
Normal function of mixing valve when operating conditions are
unsatisfactory.
a.
Check strainers and inlet/outlet fittings for flow restriction.
b.
Make sure that the minimum flow rate is sufficient for the supply
conditions.
c.
Make sure that the dynamic inlet pressures are nominally balanced.
d.
Make sure that the inlet temperature differentials are sufficient.
e.
Check thermostatic performance; renew thermostatic cartridge if
necessary.
3.
No flow from
mixing valve
outlet.
a.
Check strainers and inlet/outlet fittings for blockage.
b.
Hot or cold supply failure; thermostat holding correct shutdown function:
rectify, and return to 2e above.
4.
B l e n d
t e m p e r a t u r e
drift.
Indicates operating conditions changed.
a.
Refer to symptom 2 above.
b.
Hot supply temperature fluctuation.
c.
Supply pressure fluctuation.
5.
Hot water in
cold supply or
vice versa.
Indicates checkvalves require maintenance, refer to section:
‘
Maintenance’
.
6.
Maximum blend
t e m p e r a t u r e
setting too hot
or too cool.
a.
Indicates incorrect maximum temperature setting; refer to section:
‘Commissioning’
b.
As symptom 4.
c.
As symptom 5.
7.
Water leaking
f r o m v a l v e
body.
a.
Seal(s) worn or damaged, obtain service pack, and renew all seals.
If leak persists from around the temperature spindle, renew the
thermostatic cartridge.
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