MASTERTEMP 125 Pool and Spa Heater Installation and User’s Guide P/N 475114 Rev. F 8/2020
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Troubleshooting Instruction
TROUBLESHOOTING FLOW CHARTS
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
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 33)
Go to chart “HEATER WILL
NOT FIRE - B”
(Page 34)
Go to specific safety switch
troubleshooting chart
(Pages 35 and 37)
Go to chart ‘HEATER WILL
NOT FIRE -A and B
(Page 33 and 34)
Are any red diagnos-
tic LED’s on back of
board (AGS, AFS,
SFS, HLS, PS or
OR) “on”
NO
NO
NO
NO
NO
YES
YES
YES
NO
YES
Does red “SERVICE
HEATER” LED come
“on”
Verify that water temperature setting is
above water temperature reading. If it is,
and heater either will not fire or no red
LED’s come “on”, replace Control Board.
YES
Is POOL OR SPA displayed on
the LCD? See page 33.
See ALARMS. Heater Error
and Fault Codes, page 35.
Go to ALARMS in the menu
tree of the control board.
See page 36.
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.
Do any diagnostic LED’s on
back of board (AGS, AFS,
SFS, HLS, PS, or
E01 or 126 OR) come “on”
and stay on?
NOTICE: Any or all of the diag-
nostic LED’s may come “on”
momentarily when you turn on
the power to the heater.
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 17.
IMPORTANT! READ ME FIRST!
Start here for directions to specific Troubleshooting Chart
Fire and Explosion hazard.
EO1 or 126)
Section 3. Troubleshooting
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