Intex PureSpa SB-H20 Assembly instructions

Page 1
Pure Spa
2021SSN BUBBLE Spa Control Base Repair Guide
Characteristic Feature
Item #
28426/28428/28476
Control base #: 12836
Model #:
SB-H20；SB-H20N
Panel Digital Cable
(new) hexagon type
Control Panel
Power button on the panel
Tub shape
Round & Octagon type
Production date
Start from 2020-6-15
Introduction
The purpose of this guide is to help you understand how to repair
the most common issues with the main heating and filtration unit.
This includes problems with the various internal sensors, the
internal computer (printed circuit board), water and air pumps.
IMPORTANT
Unplug the power cord before replacing spare parts.

Page 2
28426 Internal Part

Page 3
28426 Internal Part
REF.
SP#
QTY
DESC
1
12840
1
SPA CONTROL PANEL FOR 28425/28426
2
12913
1
BUBBLE SPA CONTROL BASE BACK COVER-KHAKI
3
12770W
2
CONTROL BASE SIDE COVER
5
12846
1
PTC HEATER FOR 28442
6
12848
1
AIR BLOWER FOR 28442
8
12836
1
SPA CONTROL BASE FOR 28426/28428/28476
9
11998
1
SPA RCD
10
12914
1
AIR PIPE SET DOWNWARD FOR BUBBLE SPA-KHAKI
11
12915
1
WATER INLET TUBE FOR BUBBLE SPA-KHAKI
12
12916
6
SCREW FOR SPA BASE
13
12917
1
BUBBLE SPA BASE-KHAKI
14
13052
1
MAIN CIRCUIT BOARD FOR 28426
15
12772D
2
SIDE COVER FIXER
17
12771D
2
SIDE COVER BASE
20
12775W
1
DEFLATION OUTLET CAP
21
10064
1
SPA CONTROL PANEL FIXER-BROWN
22
12919
1
TRANSFORMER FOR SB-H20 BUBBLE SPA
23
12920
1
RECTIFIER BRIDGE FOR BUBBLE SPA（From 20201103 rectifier bridge built in main circuit board#13052）
From 20201103, Rectifier bridge built in Main circuit board#13052
From 20201103, Rectifier bridge built in Main circuit board#13052
From 20201103, Rectifier bridge built in Main circuit board#13052
）
27
11687
1
SPA CONTROL STATION AIR INLET O-RING
28
11746
1
AIR INLET CONNECTOR NUT FOR 28401/02/03/04
29
10836
1
RUBBER CAP FOR #03R/#638/#638R/638G/637R MOTOR
30
10840
1
RESISTANCE TO RUB WASHER FOR #03R/#638/#638R/638G/637R MOTOR
31
12077
1
CERAMIC BAR FOR 28401MW/28403/04/21/22/23/24/43/44/53/54 & 28402 MADE ON/AFTER 2013-12-10
32
12084
1
MAGNETIC ROTOR AND IMPELLER FOR 28404/28422/28444/28454 & 28402 MADE ON/AFTER 2013-12-10
33
12778
1
FILTER MOTOR FOR 28462
34
12580
1
20-40℃TEMP. SENSOR FOR BUBBLE SPA MADE ON/AFTER OCT 1ST, 2016
35
12581
1
50℃TEMP. SENSOR FOR BUBBLE SPA MADE ON/AFTER OCT 1ST, 2016
36
12029
1
84℃TEMP. FUSE FOR 28402/28404 (14, 15 & 16 VERSION)
37
12310
1
OUTLET FLOW SENSOR FOR BUBBLE SPA (16 VERSION)
38
11745
1
WATER INLET/OUTLET CONNECTOR NUT FOR 28401/02/03/04 (KAKHI)
39
12918
1
WATER OUTLET TUBE FOR SPA-KHAKI
40
12006
1
SPA FILTER MOTOR CONNECTING TUBE
41
12751
2
FILTER MOTOR OUTLET O-RING FOR BUBBLEAND COMBO SPA
42
12601
1
BUBBLE SPA CONTROL BASE INLET HOSE W/ KAKHI NUT

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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

Page 5
PCB Schematic
New Old
Remark: From 2020-11-03, Rectifier bridge built in Main circuit board#13052, terminal block E&F change to
Q&R. The PCB layout has been totally different with before.

Page 6
Basic Tools
This is a list of basic tools required to repair almost any problem encountered with a control base. Tools
such as a digital multimeter and clip-on ammeter are used to test the electrical current of various
components on the control base. Psophometers are used to test certain components based on the
loudness of the sound they produce. Water thermometers check the temperature of the spa’s water and to
verify readings provided by the system’s internal thermometers. Screwdrivers and wrenches will help you
disassemble and reassemble the unit.
Tools required for spa control base repair
NAME SPEC. PHOTO
1
digital multimeter
0.1mVac-1000Vac/0.1mVdc-1000Vdc,
0.1uAac-10Aac/0.1uAdc-10Adc
2
clip-on ammeter 20A
3
psophometer 30-130dB
4
water thermometer 0-50◦C
5
electric Phillips screw
driver
5X100mm.
8X200mm.
6
Phillips screw driver 5X100mm.
8X200mm.
7
Slotted screw driver 3X100mm.
8
Adjustable wrench 6", 8"

Page 7
Understanding a Multi-Meter
The range with a V and a wavy line measuresAC voltage
The range with a V and a straight line measures DC voltage
First determine whether you will be testing for AC or DC voltage based on this guide and adjust the meter to
a range above the expected reading. For example, if we are looking for a DC voltage between 12 & 14, the
knob should be set to 20V in the DC range.
The position of the black and red probes/ports makes little difference. Anegative number will be displayed if
the cables are swapped. Ignore this and the number displayed is the current reading.

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Basic Spa Components
Control Base - This part houses the heater, water pump, and an air pump.
Control Panel- The Control Panel has a display used to adjust temperature and provide diagnostic
information when there are problems with the Control Base
Spa Tub- Holds the water. The tub is different depending on spa’s features. The inner structure features
Dura-Beam construction for strength
Spa Cover –An inflatable safety cover
Important for insulating spa water
Ground Cloth - A cloth that goes underneath the spa tub and provides protection from the ground
Control Base
Control Panel
Spa Tub

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Model #
Code
SB-H20:
(SB)n1-(H)n2(20)n3
n1
SB = Spa Bubble
n2
H = With Hard Water features
n3
20 = 220-240V working wattage

Page 10
Wiring Schematic
Main circuit Board