Troubleshooting - Pentair MiniMax Plus Service Manual

Troubleshooting

The circuit board in the MiniMax Plus uses lights that are wired in sequence with the controls. The
MiniMax Plus still uses the same controls as the original MiniMax but this method of wiring is more
helpful while trouble shooting.
Sequence wiring means that each control is wired separately from the other controls and they are
independently attached to the circuit board. This is how the wiring method works to help diagnose a
problem.
Power is connected to the board directly from the Transformer. So, if the Transformer is wired
correctly and is being supplied with voltage, the Power Light will be "ON".
When you push the Pool/Spa Switch to either position and turn the thermostat knobs to Hot, the
voltage is transferred into the circuit board, through the Thermistor, Potentiometer and down to the
Remote Control terminals. If the Thermistor and Potentiometer are working the "T"STAT Light will
come "ON".
If there is a Remote Control connected to these terminals, the voltage travels to the remote switch
and back to the circuit board and the "AUX" Light comes "ON". If there is no remote, there will be a
Jumper wire across the remote terminals causing the "AUX" Light to come "ON".
If the voltage comes across the remote control terminals, it will go back into the circuit board and
go to the Pressure Switch. If the Pump is On and Primed and there is enough water flow, the Pressure
Switch will close and the "PRESS" Light will come "ON".
On the back of the circuit board, there are (3) more lights. "HIGH LIMIT", "THERMAL CUT
OFF" and "PILOT VALVE". Voltage must travel to and through the High Limits, Thermal Cut Off
and finally to the Orange "Pilot Valve" wire before the Module will start to Spark. And each time the
voltage goes through a control, indicating that the control is working, the voltage must go back to the
circuit board, where it lights the control indicator light.
With this method of wiring we can easily see which control is not working by looking at the FIRST
LIGHT that is NOT LIT because we know that voltage has to pass through the control and back to
the board in order for the light to come "ON". If the Light is NOT "ON", look at that control first.
JUMPER REQUIRED IF NO REMOTE SWITCH
25D K .032 D.C TAB
Rev. C 12-1-00
24V
1
J2 J3
AUX.
CONTACTS
CONTROL RELAY
J6 J8 J5
CLOSE ON CALL
FOR HEAT
SPA COM POOL
P6 P8 P5
POOL OFF SPA
THERMOSTAT SELECT SWITCH
DIAGNOSTIC LIGHT OPERATION
IGN MODULE
VLV
J4 J11
J7 JI0
1
1 1
TPROBE
THERMOSTAT
CIRCUIT BOARD
J9
P9
BLK
BLK
2 1
TEMPERATURE
PROBE
P/N 38033