
S59-2007 Series Installation
6 9/29/2017 Bradley • 215-1297 Rev. L; ECN 17-09-008
Clean the valve
seats and other
components with a
small wire brush. Stop/Check Valves
Troubleshooting Thermostatic Mixing Valve
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-connections or leaking stop/
check valves
• Water heater output is at least 15° F above the set
temperature.
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.
Valve appearance may differ slightly.
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 (S65-204).
No hot water flow
(cold water flow only)
The thermostat has failed and,
subsequently, the safety shut-off has
engaged (the shut-off valve has closed on
either the inlets or outlet).
Check the thermostat for proper operation:
1. At room temperature (80° or less), remove the top cap
and thermostat.
2. Place the thermostat into a small container filled
with 115° water. The pushrod should pop out of the
thermostat approximately 1/10".
If the thermostat pushrod does not pop out, the thermostat
must be replaced (it cannot be repaired). Contact your Bradley
representative and ask for Thermostat Kit (Part number S65-417).
Limited water flow The stop/check sections of the valve do not
move freely.
Clean Stop and Check Valves:
Remove the stop and checks, clean the seat and reassemble
the valve. The stop/checks may also be disassembled and
cleaned. The components may be brushed with a small wire
brush to remove debris. If the stop/check valves need to be
replaced, contact your Bradley representative and ask for
Stop/Check Valve (part number S27-102 - Rough Brass,
S27-292A - Chrome).
Dirt and debris have collected on the check
screen or seat, limiting the movement of the
stop and checks.
Temperature
fluctuation or improper
Temperature
Valve temperature is not properly set. See "Adjusting the Temperature" section.
Thermostat is slowly failing or not working
at all.
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 3 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.