Section 5. Troubleshooting - Pentair MASTERTEMP 125 Guía De Instalación Y Usuario

Troubleshooting Instruction
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.
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 CAREFULL Y:
1. Check the line voltage to your heater. This heater will operate
Start here for directions to specific Troubleshooting Chart
Is green "POOL" or "SPA"
LED "on"?
YES
Is red "SERVICE SYSTEM"
LED "on"?
NO
Is red "SERVICE HEATER"
LED "on"?
NO
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
THERMISTOR) 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.
WARNING
Hazardous voltage. Can shock, burn or kill.
Disconnect power before servicing any components.
Rev. C 3/2019
IMPORTANT! READ ME FIRST!
NO
YES
Are any red diagnos-
tic LED's on back of
YES
board (AGS, AFS,
SFS, HLS, PS or
THERMISTOR) "on"
YES
NO
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.
MASTERTEMP 125 Pool and Spa Heater Installation and User's Guide

Section 5. Troubleshooting

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.
Go to chart "HEATER WILL
NOT FIRE - A"
(Page 38)
Go to chart "HEATER WILL
NOT FIRE - B"
(Page 39)
YES Go to specific safety switch
troubleshooting chart
(Pages 41 and 42)
NO
YES
Go to chart 'HEATER WILL
NOT FIRE -C"
(Page 40)
NO
WARNING
Fire and Explosion hazard.
switch terminals to remedy a failed safety switch.
37
Do not jumper