Water temperature fluctuation

[Wade Johnson]

Hello gentlemen, Just in a condo building that has a central water heater. The condo unit has 2 showers. The hall shower operates properly. The master shower starts out with a normal (warm) temperature than it starts to fluctuate between scolding hot & ice cold. Any ideas to the cause.
Thanks in advance.

[Jerry Peck]

It may have a mixing valve which is bad.

[Jeff Remas]

Jerry, you forgot to post code text.

Individual shower valves. Individual shower and
tub-shower combination valves shall be balanced-pressure,
thermostatic or combination balanced-pressure/thermostatic
valves that conform to the requirements of ASSE 1016 or CSA
B125 and shall be installed at the point of use. Shower and
tub-shower combination valves required by this section shall
be equipped with a means to limit the maximum setting of the
valve to 120°F (49°C), which shall be field adjusted in accordance
with the manufacturer’s instructions. In-line thermostatic
valves shall not be utilized for compliance with this
section.

[Jerry Peck]

It may have a mixing valve which is bad.


Jerry, you forgot to post code text.

Huh???

There is code text about mixing valves which may be bad? Where? :confused:

By the way, when posting code text, which is what it looks like you did, you should first state what code and edition it is from.

[Ted Menelly]

Bad valve about does it