Heater Will Not Fire Troubleshooting - Pentair MASTERTEMP 125 Guía De Instalación Y Usuario

Section 5. Troubleshooting
38
Heater Will Not Fire - A
Start
Is green "SPA" or
"POOL" LED "on"
YES
Check that correct 12-pin
plug is installed (red is
240V, black is 120V)
NO
If plug is not installed:
Install correct plug.
240V plug in 120V
circuit: Replace with
correct plug.
120V plug in 240V
circuit: Replace trans-
former, control board,
and ignition control
module (see "HEATER
WILL NOT FIRE-C and
-D", Pages 40 and 41).
Check fuse and all
other 24V components
for damage.
GO TO
"HEATER WILL NOT FIRE - B"
Page 39
MASTERTEMP 125 Pool and Spa Heater Installation and User's Guide
Depress "POOL" or "SPA" ON
NO
button on Membrane Pad.
Does "POOL" or "SPA" LED
come on?
YES
Check for line voltage to
heater.
YES
Check for 24 VAC at sec-
ondary of Transformer.
YES
Check for Line Voltage
between L1 and L2 terminals
on Terminal Board.
Check for Line Voltage at
Transformer primary pins.
White connects to Pin 3 on
Transformer, Black to Pin 2,
Orange to Pin 1.
240V: check Pin1 to Pin 3.
120V: check Pin 2 to Pin 3.
Jumper Fireman's Switch at
Terminal Board and depress
"POOL" or "SPA" ON button on
membrane pad. Does "SPA" or
"POOL" LED come "on"?
Leaving jumper in place,
YES
check for 24 VAC between
Fireman's Switch terminals
and ground.
Remove jumper. Check ribbon
cable connection between
Membrane Pad and J6 on
Control Board. Depress
"POOL" or "SPA" On pad
NO
again. Does "POOL" or "SPA"
LED come on?
Jumper pins 6 and 5 on J6 of
Control Board. Does "SPA"
LED come on?
Jumper pins 6 and 4 on J6 of
Control Board. Does "POOL"
LED come on?
YES
NO
NO
NO
NO
YES
NO
YES
YES
NO
NO
YES
YES
NO
Heater should fire on demand
for heat.
Restore power to heater.
Check wiring connections
between power supply and
Junction Box and between
Junction Box and Terminal
Board; restore continuity.
Check wiring connections
between Terminal Board and
Transformer primary and
restore continuity.
Replace Transformer.
Check Fireman's Switch circuit
connections (time clock, wiring,
external controller relay).
Remove jumper. Check wiring
between Transformer and J7
terminals on Control Board
and between J7 and
Fireman's Switch on Terminal
Board, check fuse, and
restore continuity.
Heater should fire on
demand for heat.
Replace Membrane Pad.
Replace Control Board.
Rev. C 3/2019