MASTERTEMP 125 Pool and Spa Heater Installation and User’s Guide P/N 475114 Rev. F 8/2020
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POOL MAX (65°F-104°F): The maximum heater operating temperature for the pool.
SPA MAX (65°F-104°F): The maximum heater operating temperature for the spa.
UNITS: Select F (Fahrenheit) or C (Celsius) to display change the display of the heat settings. Select US or Metric units.
HISTORY: Use Up/Down button to scroll through the last ve heater errors.
CYCLES: Number of heater on/off cycles.
RUNTIME: Total number of hours the heater has spent heating the water.
SFS TEMP: Displays the current Stack Flue Sensor temperature.
FLAME: Displays the current ame sensor status (Normal or Low).
BACKLITE: Time-Out Enabled/Disabled:
Time-Out Enabled: The LCD backlight will turn off after two minutes of no control panel key pad activity. After three
minutes of no key pad activity the LCD will turn off. When the LCD and/or the Backlight are off, any button press will
turn the LCD and backlight back on. After that, the control panel buttons are in normal operating mode.
Time-Out Disabled: The LCD and backlight will stay on continuously and will not timeout.
HTR ADDR: Set the heater address (1-16) for automation control.
BP-VALVE (By-pass Valve): Enabled/Disabled
By-pass Valve Description
e purpose of the automatic BPVALVE (bypass valve) feature is to by-pass the ow of water from the heater
inlet to the heater outlet when the heater is not ring. ere is a minimal amount of water ow through the
heater when the heater is not ring, and a maximum water ow through the heater when the heater is ring.
For more information about Manual By-Pass and Automatic By-Pass valves, see page 5 and 6.
By-Pass Enabled
When the BYPASS VALVE feature is enabled and there is a call for heat, the by-pass valve closes to allow
water to ow through the heater. It takes 30 seconds for the bypass valve to rotate to the closed position. This allows
the valve to complete rotation so there is sufcient water ow and pressure to prevent the water pressure switch from
trigging an error. When the call for heat ends, the water ow continues through the heat exchanger for a cool down
period of one minute. After the cool down period, the by-pass valve will rotate so that water no longer ows through
the heater.
By-Pass Disabled
When the BYPASS VALVE feature is disabled, there is no automatic switching of the by-pass valve when the heater
starts a heating cycle. The valve stays in the position and water always ows through the heater.
LANGUAGE: English, Spanish or French
VERSION: View the current heater rmware version.
Section 2. Operation
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