Installation
EFX 60/S19-2200
Bradley
• 215-1289 Rev. P; ECN 18-09-005
2/26/2018
7
Troubleshooting Thermostatic Mixing Valve
Problem
Cause
Solution
External leaks in the
system
Either the NPT joints or the o-rings have
been damaged.
Replace the NPT joints and/or o-rings where necessary. For
replacement of o-rings, contact your Bradley representative
and ask for O-Ring Seal Kit (S65-177).
No hot water flow
(cold water flow only)
The thermostat has failed and,
subsequently, the safety shut-off has
engaged.
Inspect Thermostat:
1. Remove the top cap and pull out the push rod and
thermostat.
2. Insert a 7/16" dia. rod into the thermostat bellows.
3. Mark the length of the thermostat bellows (at room
temperature, with 10 lb. of force, the bellows length
should be approx. 2-5/8").
4. If the thermostat bellows length is not in the proper
range, the thermostat must be replaced (it cannot be
repaired). Contact your Bradley representative and ask
for Thermostat Kit (S65-178).
Limited water flow
The inlet shut-off valve may be partially
closed or there has been a significant
decrease in water pressure.
Dirt and debris have collected on the check
screen or seat, limiting the movement of the
stop and checks.
Clean Stop and check Valves:
Remove the stop and checks, clean the screen and seat
and reassemble the valve. Do not remove the seat. The
components may be scraped with a screwdriver to remove
debris. A pair of tweezers works well for pulling debris out
from the seat. If the stop and checks need to be replaced,
contact your Bradley representative and ask for Check/Stop
Kit (S65-179).
Temperature
fluctuation or improper
Temperature
The stop and check sections of the valve do
not move freely.
Clean Stop and Check Valves as described above.
Thermostat is slowly failing.
Check Thermostat as described above, or replace.
Inlet supply line to the mixing valve is being
shared by other pieces of equipment that
are used only periodically, such as laundry
appliances or washdown stations. It may
reduce the inlet pressure to the mixing valve
to less than 10 PSI. The supply line size
may not be large enough to supply both the
valve and the other appliances.
Enlarge the supply line size, reconfigure the supply line or
regulate the supply usage.
Recirculation is not balanced.
Review recirculation set up on page 6.
Piston does not move freely and must be
cleaned.
See next page for piston disassembly and cleaning directions.
Before attempting to troubleshoot the valve or disassemble the
components, check for the following:
• Stop/check valves are fully open (the slotted stem must
be flush with the stop/check cap) and that all inlet and
outlet shut-off valves are open
• Hot and cold inlet pipes are connected properly, and
that there are no cross-connectio ns or leaking stop/
check valves
• Water heater output is at least 15° F above the set
temperature.
Check and Stop
Valve Seat
Stop/Check
Strainer
Be sure to close the appropriate shut-off valves
prior to disassembly of the valve and reopen the
valves after inspection and repair is complete.
