Pentair MiniMax Plus Service Manual page 22

Troubleshooting
1. The POWER Light indicates voltage to the
circuit board from the Transformer. On the
previous MiniMax heaters, the voltage from the
transformer went through a switch and the
switch had to be pushed either to Pool or Spa
in order for the light to come on. The MiniMax
Plus Power Light will be On without pushing
the Pool/Spa switch, as long as there is power
being supplied to the transformer.
2. The T-STAT Light or Thermostat Light will come
on if there is voltage to the Potentiometers and
they are turned to the Hot Position and the water
temperature is below the hot set point.
3. The AUX Light or Remote Switch Light will come
on if the Remote control is operating properly and/
or is attached to the back of the circuit board
correctly. If the heater is not connected to a remote
switch, there will be a small jumper wire attached
to the circuit board to make the light come on.
4. The PRESS Light is attached to the Pressure Switch
and will come on if the Pump is On and is pumping
enough water to create enough water pressure to
close the points on the Pressure Switch.
P/N 38033
DIAGNOSTIC LIGHTS
5. The HEAT Light is attached to the MV (Main
Valve) terminal on the module. This terminal does
not receive voltage until a Pilot Flame has been
established. Once the MV terminal has voltage, it
tells the Gas Valve to open and gas flows to the
Burners and is ignited by the pilot flame.
6. The SERVICE Light is a dual purpose light. When
the Pilot is sparking, the Service Light will be on
until the pilot Flame is established. The Service
Light will also be on if there is a problem with the
High Limits, Thermal C/O or Pilot Valve on the
Module.
NOTE
Each Diagnostic Light is wired in sequence.
Meaning that the power must pass through
the "T" STAT first , the AUX second , the
PRESS third and then to the HEAT LIGHT
fourth . If any control fails or the wiring to
that control does not transfer voltage to that
control, the designated light will not be lit.
So, by checking for the first light that is not
on, we suspect that control or connecting
wire to be at fault.
2 2
Rev. C 12-1-00