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3. Troubleshooting
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.
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.
P/N 475106 Rev. D 1/2016
All manuals and user guides at all-guides.com
IMPORTANT! READ ME FIRST!
READ THE FOLLOWING CAREFULLY:
1. Check the line voltage to your heater. This heater operartes
on 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,
plug in the RED 240 volt plug.
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.
NO
YES
YES
NO
YES
NO
WARNING
Fire and Explosion hazard.
switch terminals to remedy a failed safety switch.
™
MASTERTEMP
Pool and Spa Heater Installation and User's Guide
Go to chart "HEATER WILL
NOT FIRE - A"
(Page 26)
Go to chart "HEATER WILL
NOT FIRE - B"
(Page 27)
Go to specific safety switch
troubleshooting chart
(Pages 30 & 31)
Go to chart 'HEATER WILL
NOT FIRE -C"
(Page 28)
Do not jumper
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