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Page 4

Table of Contents

PCB Schematic ---- 5

Basic Tool ---- 6

Understanding a Multimeter ---- 7

Basic Spa Components ---- 8

Control Base Repair

Schematics ---- 10

Opening the Control Base ---- 11

Accessing to PCB ---- 12

Internal Parts ---- 13-15

PCB ---- 16

Display Errors

Code E90 – No water flow ---- 17

Flow Sensor ---- 17

Water Pump ---- 18

Transformer ---- 19-20

PCB ---- 20

Code E94 – Water temperature too low ---- 21

Code E95 – Water temperature too high ---- 23

Code E97 – Dry-fire Protection ---- 24

Code E99/100 /000 – Bad temperature sensor ---- 25

END/ Heating problems ---- 26-27

Blank Panel ---- 28

Random Display or 888 ---- 29

Functional Errors

Air Blower problem ---- 30-31

How to replace RCD ---- 32

How to replace the printed circuit board (PCB) ---- 33

How to replace the broken base of bubble spa control ---- 34

Intex 28428 User Manual

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