MASTERTEMP
125 Pool and Spa Heater Installation and User’s Guide 460906 Rev. D 8/2020
48
Troubleshooting
Initial Troubleshooting
Only qualified, trained service technicians with appropriate test equipment should service the heater. Remember
that all parts of the system affect heater operation. Before starting this troubleshooting procedure, make sure
that the pump is running correctly, that there are no blockages in the system, that the valves are correctly set
and that the time clock is correctly set and is running.
CAUTION: Installing the BLACK 120 volt plug in the control box and then connecting the heater to a
240 volt line will destroy the transformer, control broad, and ignition control module, and will void the
warranty. If you install the RED 240 volt plug and then connect the heater to a 120 volt line, the heater
will not operate. See page 34.
READ THE FOLLOWING INFORMATION CAREFULLY
1. Check the line voltage to your heater. This heater will operate on either 120 Volts AC or 240 Volts AC.
2. Remove the covers and check the 12-pin plug in the back of the control box. The plug must match the
voltage in the heater circuit.
3. If the 12-pin plug is not plugged into the back of the control box, select the correct plug from the bag in
the control box and plug it in. The BLACK plug is for 120 volts, the RED plug is for 240 volts.
Section 3. Troubleshooting
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