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.

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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

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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"

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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

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Opening the Control Base
Begin by removing 6 screws around the enclosure. Then take strength to pull out the connector. Open the
deflation outlet cap with the included bolt wrench and unscrew the one screw that link the outlet cap to
release it from the wire.
Removing 4 screws around the cover that hold enclosure
Removing 2 screws near on side, remove the panel from control bas
Release the screw and disconnect the black cord

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The Control Panel connector is attached to the outer casing, lift the cover vertically carefully to ensure the
cable is not pulled and connection between base and cover is not damaged.
Accessing the PCB
Remove the 2 screws that secure the white PCB cover to reveal the PCB. Unscrew the 2 screws on the
holder to remove the PCB set from the Control Base.

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Internal Parts
B
C
G
D
H
F
A
I
E
A: The terminal has been changed from
Nov.03-2020, the indicate mark is Q, R, C, D

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NO.
ITEM
Part #
A
Transformer
12919
B
Air Blower
12848
C
PCB (Main Circuit Board)
13052
D
Base
12917
E
20-40℃Temperature Sensor
12025
F
Heating Element
12846
G
Flow sensor
12310
H
84℃Temperature Sensor
12029
I
50℃Temperature Sensor
12026
Internal Parts
N
M
J
K
L

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NO.
ITEM
Part #
J
Water Inlet for Tub
12601
K
Water Outlet for Tub
12915
L
Air Inlet nut
12914
M
Electrical Cord with RCD
11998
N
Water Pump (Filter)
12778
Internal Parts
Main circuit Board
HGRQDCBA
Black:"50C 黑" - Water Temperature
Sensor
White:"20~40C 白" - Water Temperature
Green: "FLOW 绿" - Flow Sensor one (E90)
Yellow:"84 C 黄" - Dry Fire Protection (E97)
1 & 2 - Main power supply
5 & 6 - Transformer power input
7 & 8 - Air blower power
9 to 12 - Heating element power
A & B - Filter pump power input
C & D - Transformer output for Filter Pump
Q & R –Input for control/Output of rectifier
G & H - Hardwater coil

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Error Code E90
This code indicates low water pressure which could be due to an obstruction or a problem with an internal
component.
Ensure the correct connection between the control base and tub. The tub is filled with water to the
recommended level. Ensure that all filter cartridges, filter housing & suction fittings are free from any
obstruction. Turn on the spa control base.
Run the filtering function for 1 minute. If the spa display doesn’t indicate an error code and the unit is
circulating water without issue, no further troubleshooting is necessary. Remove the unit for further testing if
Error Code 90 continues to appear on the panel. If the display indicates Code E90, please follow the logic
diagram and instructions as below (E90 has two cases)：
Yes
Yes
No
Replace Filter Motor or Rotor
/Ceramic Bar, run system
Power on and run filter
Water
flow?
Remove cartridge
assembly, run system
No
1 Min
E90?
END
Terminal
5&6≈220V?
Terminal
C&D≈12V?
Terminal
A&B≈12V?
Replace PCB
Replace PCB
Replace Motor
Replace
Transformer
Yes
Yes
No
E90?
Bypass the flow sensor
terminal
END
1 Min
No
Replace Flow Sensor
Replace Heater Set
Replace PCB
Run 1 min.
E90?

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Error Code E90 (Flow Sensor)
1. Check the connection of the flow sensor. Make sure connectors are in good contact. Ensure that the
pins inside the connector are not broken or bent. Color and style of connector may be different from
the one shown in the photo below. To ensure you are looking at the right cable, follow it back from
the PCB terminal marked FLOW.
2. Proceed to testing the unit if the connection was bad to verify. Go to the next step if problem is not
fixed.
3. Check the flow sensors. Short the terminal to simulate an inactivated flow sensor after turning on the
system and run the filter function. Flow center is located near the air blower.
Replace the defective flow sensor if the system does not display Code 90 and turn off.
a. Start by unscrewing the PCB cover to reveal the PCB. Disconnect the flow sensor terminal on the
PCB as well as terminals H&G.
b. Release the screws for Flow sensor replacment.

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Error Code E90 (Water Pump)
If the display indicates Code 90 & there is no water flow;
1. If only a click can be heard from the pump when attempting to turn on the unit, there is likely a
problem with the water pump. Check the water pump for any broken parts inside.
a. Refer to the control base open procedure to open the enclosure and base opening procedure to
open base
b. Disconnect water pump power cable. Unscrew brown nuts by loosening. Release the screw.
Disconnect the black power cord
c. Unscrew 5 screws on the pump to reveal the impeller and ceramic shaft. The impeller is magnetic
so pull it out carefully and make sure it doesn’t come in contact with anything sensitive to
magnetism. Check for broken parts.
d. Replace any broken pieces and reinstall the shaft, impeller, washer and rubber caps. Place a
rubber cap on the end of the shaft and add a washer over it. Insert the end with the rubber cap into
the water pump.

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e. Carefully drop the impeller into the pump and ceramic shaft. The magnetism from the impeller is
strong so take care not to position your fingers between the impeller and the pump. Add a washer
on the ceramic shaft and a rubber cap over the washer.
f. Reinstall the water pump cover. Check to see that the rubber cap fits into the corresponding
opening on the cover. Screw down the cover using the 5 screws.
g. Install the reassembled water pump on the control base. Check to make sure the seal on the
pump housing in in place before putting in the pump. Secure the motor cover with screws.
Connect the water pump power cable.
Error Code E90 (Transformer)
1. Test the voltage of the transformer with a multi-meter.
a. Check terminals (1&2), (5&6), (C&D), and (Q&R). Set the multi-meter for AC current with a
range that will measure 12-14 Vac. Turn on the system and run the filtering function. Touch
each of the terminals with a multi-meter in pairs and see if the reading on the multi-meter is
between 12&14 Vac. Terminals (1&2) and (5&6) is equal to the socket output which depends
on the local power supply.
b. The test should be completed in 5 seconds after activating the filter function.
i. If (1&2) have a voltage reading and (5&6) do not, the PCB must be replaced
ii. If (5&6) are ok, and (C&D) and (Q&R) are not ok, the transformer must be replaced.
Proceed with the instructions below for replacing the transformer.
c. Replacing the transformer
i. Disconnect (C&D), (Q&R) and (5&6) on the PCB to disconnect the transformer. Then
remove a single screw that holds the outlet jet to a plastic support. Disconnect (7&8)
on the PCB to disconnect the air blower
ii. Remove 3 screws that hold the bubble blower to the heating element support and
disconnect the drain hose. Remove 1 screw that wired the blower to the heating
element equipotential bonding system.
iii. Remove screws holding air blower to the rest of the jet. Use wrench to disconnect the
threaded nut of blower. Remove 3 screws holding the black part above the transformer

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iv. Once the transformer has been exposed, remove 2 screws holding down the cover on
the transformer. Take off the cover to expose the transformer. At the picture below, all
parts taken from the jet spa are laid out for reference.
v. Once the transformer has been exposed, it can be taken out and replaced.
Error Code E90 (PCB)
1. Test the voltage of the PCB
a. Check terminals (A&B). Set the multi-meter for AC current with a range that will measure
12-14 Vac. Touch one of the multimeter’s leads to A and the other to B. Turn on the system
and run the filtering function. See if the reading on the multimeter is between 12 & 14 Vac.
b. Replace the PCB if the unit fails to give a reading. Follow the PCP replacement instructions.
Error Code E90 (Heating Element / Heater Set)
To change the heating element, first disconnect the flow sensor cables, temperature sensor cables,
power terminals (9 to 12). Remove the 4 screws holding the heating element. Release the water tube under
the heating element by hand. Disconnect the external equipotential bonding conductors on the heating
element. Ensure these equipotential cables are reinstalled.