Troubleshooting
Under normal operating conditions the Caleffi 5212 series thermostatic mixing valve will provide a
very high level of performance. However, in some circumstances, when the included maintenance
plan is not properly performed, the following problems may arise.
Sympton
Cause
Corrective action
Hot water at the cold faucets a) Inserted check
operation failed.
b) Check valves not
installed.
Replace faulty check valves.
Fluctuating mixed water
temperature
a) Erratic supply
temperatures at the
valve inlets.
b) Starvation of the
water supplies at the
valve inlets.
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 pressure and/
or temperatures.
c) Adverse effect
created by other
draw-off points on the
system.
Stabilize inlet supply conditions.
No water flowing from the
valve
a) In-line strainers
blocked.
b) Insufficient supply
pressures.
c) Debris obstructing
valve operation.
a) Clean or replace strainers.
b) Restore inlet supplies.
c) Clean debris or scale from valve
internals.
Caleffi North America, Inc.
3883 West Milwaukee Road
Milwaukee, WI 53208
T: 414.238.2360 F: 414.238.2366
03-16-2020
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