Install Instructions

Caleffi North America, Inc.
3883 West Milwaukee Road
Milwaukee, WI 53208
T: 414.238.2360 F: 414.238.2366
Troubleshooting
Under normal operating conditions the Caleffi 5231 series thermostatic mixing valve will provide a
very high level of performance. However, in some circumstances, where our maintenance plan is not
followed, the following problems may arise.
Symptom Cause Corrective action
Hot water at the cold taps a) Operation of check valve
is hindered; check valve is
not sealing correctly
b) Check valves not fitted
• Replace faulty check valves
Fluctuating mixer water
temperature
a) Erratic supply
temperatures at the inlets
of the valve
b) Starvation of the water
supplies at the inlets of
thevalve
c) Incorrect commissioning
ofthe valve
• Restore inlet conditions
within the limits of the valve
Erratic flow of water from
thevalve
a) Insufficient water supplies
b) Fluctuations in supply
pressures/temperatures
c) Adverse effect created by
other draw off points on
the system
• Stabilize inlet supply
conditions
No flow of water from
thevalve
a) In-line filters blocked
b) Insufficient supply
pressures
c) Debris obstructing
valveoperation
• Clean filters
• Restore inlet supplies
• Clean debris or scale
fromvalve
04-30-18
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