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Fault Diagnosis
Symptom
1. Only Hot or Cold Water From
Outlet
2. Fluctuating or Reduced Flow
Rate
3. No Flow From Mixing Valve
Outlet
4. Blend Temperature Drift
5. Hot Water in Cold Supply or
Vice-Versa
6. Water Leaking form Valve Body
7. Cold Water does Not Flow After
Hot Supply Failure
8. Hot Water continues to Flow
After Cold Supply Failure
1290447-W2-B
Cause/Action
a. Inlet supplied reversed (i.e. hot supply to cold inlet) can be diagnosed by
isolating the inlet supplies and removing the valve cartridge. With cartridge
removed, turn the water on at each supply individually and at a very low flow rate
(water will run out of the front of the valve body). Identify which inlet is the hot
supply and which is the cold supply. Re-install the cartridge matching the raised
H and C on the cartridge body to the inlets as identified.
b. No hot water reaching mixing valve. Check
c. Check strainers and inlet fittings for blockage.
d. Refer to symptom 5 below.
e. Installation conditions continuously outside operating parameters
f. Normal function of mixing valve: indicates hot water inlet supply failure/
interruption.
Normal function of mixing valve when operating conditions are unsatisfactory.
a. Check strainers and inlet/outlet fittings for flow restriction.
b. Ensure that minimum flow rate is sufficient for supply conditions.
c. Ensure that dynamic inlet pressures are nominally balanced
d. Ensure that inlet temperature differentials are sufficient.
e. (Subject to rectification of supply conditions). Check the thermostatic
performance; renew cartridge assembly if necessary.
f. Normal function of mixing valve: indicates hot water inlet supply failure/
interruption.
Check that inlet flow controls are fully open.
a. Check strainers and inlet/outlet fittings for blockage.
b. Cold supply failure; thermostat holding correct shutdown function: rectify, and
return to 2e above.
Indicates operating conditions changed.
a. Refer to symptom 2 above.
b. Hot supply temperature fluctuation (rectify and refer to Commissioning).
c. Supply pressure fluctuation (rectify and refer to Installation).
Indicates check valves require maintenance (refer to Maintenance).
Seal (s) worn or damaged.
a. Obtain seal pack, renew all seals.
b. (If leak persists from around temperature spindle). Renew cartridge assembly.
a. Incorrect valve model installed. Check and rectify.
b. Incorrect internal cartridge installed. Check identification code and rectify
c. Check strainers and inlet/outlet fittings for blockage
d. Cold supply failure.
a. Incorrect Valve commissioning. Validate the Commissioning.
b. Insufficient temperature differential see validate commissioning.
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