MasterTemp Pool and Spa Heater P/N 474131 Rev. M 8/2020
48
Section 3. Troubleshooting
Troubleshooting Instruction
Hazardous voltage. Can shock, burn or kill.
Disconnect power before servicing any components.
Do not jumper
switch terminals to remedy a failed safety switch.
WARNING
WARNING
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.
Go to chart “HEATER WILL
NOT FIRE - A”
(Page 49)
Go to chart “HEATER WILL
NOT FIRE - B”
(Page 50)
Go to specific safety switch
troubleshooting chart
(Pages 49 and 50)
Go to chart ‘HEATER WILL
NOT FIRE -A and B
(Page 49 and 50)
Are any ALARMS
shown on LCD?
NO
NO
NO
NO
NO
YES
YES
YES
NO
YES
Is the "Heating" LED
blinking?
Verify that water temperature setting is
above water temperature reading. If it is,
and heater either will not fire or NO
ERRORS are displayed. Replace Controll Baord.
YES
Is POOL OR SPA displayed on
the LCD? See page 49.
See ALARMS. Heater Error
and Fault Codes, page 51.
Go to ALARMS in the menu
tree of the control board.
See page 50.
Turn off power to heater for
about 5 seconds, and turn
back on. Make sure tempera-
ture setting is above water
temperature. Wait one minute.
NOTICE: Installing the black 120 volt plug in the control box and
then connecting the heater to a 240 volt line will destroy the trans -
former, 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.
READ THE FOLLOWING 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. See page 32.
IMPORTANT! READ ME FIRST!
Start here for directions to specific Troubleshooting Chart
Fire and Explosion hazard.
Are any errors displayed on
LCD?
Troubleshooting Flow Charts
