Thermo Sphere TSMEB-5 User manual

HEATING | WATER
MICRO ELECTRIC BOILER
Live well...
INSTALL GUIDE

Want to get rewarded for
this installation?
SIGN-UP
FOR FREE
Entry into our monthly prize giveaways
Accidental damage cover on underoor heating
On site support during and after installation
Training & development
Exclusive early access to new products
Free promotion of your work
Just scan the QR code or search online for
ThermoSphere CONNECT and ll in the
form. Nice and easy!
After you sign up instantly start uploading
your receipts to gain your rewards!
Join in 60 seconds!
Join hundreds of electric heating installers who have already signed up to
ThermoSphere CONNECT! Don‘t miss out!
Member benets:
We can‘t wait for you to join the ThermoSphere CONNECT community and start
getting the rewards you deserve for every registered installation!

0800 019 5899 [email protected]
3
Contents
Warranty terms and conditions 4
Installation checklist 5
Component guide 6
Introduction to single and tandem systems 7
Installation options 8
Specications 9
Flow rates 10
Installation procedure 11
Mounting to the wall 12
Electrical terminals and connections 13
Wiring diagrams for single and tandem installations 14
Plumbing connections 15
Preparing the unit for use 16
Operating instructions 17
Diagnostics 18
Manual intervention 19
Product registration 22
Mounting hole template 23

0800 019 5899 [email protected]
4
Warranty terms & conditions for ThermoSphere Micro Electric Boilers
For the ThermoSphere Micro Electric Boiler (TSMEB), Thermogroup Ltd will repair or, if necessary, at its sole discretion, replace the TSMEB, which
falls within the Warranty Periods and Territory specied below, subject to the warranty conditions and the warranty exclusions. Warranty Period
within the United Kingdom is 3 years from the date of purchase by the consumer as dened by the Competition and Consumer Act 2010.
Our goods come with guarantees that cannot be excluded under the UK Consumer Law. You are entitled to a replacement or refund for a major
failure. You are also entitled to have the goods repaired or replaced if the goods fail to be of acceptable quality and the failure does not amount to
a major failure. It is the responsibility of the consumer to provide proof of purchase within the Territory.
WARRANTY CONDITIONS
1. This warranty is applicable only for TSMEB appliances.
2. The TSMEB must be installed in accordance with the ThermoSphere TSMEB Installation Instructions, to be supplied with the TSMEB water
heater, and in accordance with all relevant statutory and local requirements of the Territory in which the TSMEB is installed.
3. Where a failed component or TSMEB is replaced under warranty, the balance of the original warranty period will remain effective. The
replaced part or TSMEB does not carry a new warranty.
4. Where a failed component or TSMEB is replaced or repaired under warranty, ThermoSphere will incur costs associated with shipping and
repair at its sole discretion, if the unit is installed within the UK. If the unit is outside the UK, the associated costs are the responsibility of the
owner.
5. Where the TSMEB is installed in a position that does not allow safe, ready access, the cost of accessing the site safely, including the cost of
additional materials handling and/or safety equipment, shall be the owner‘s responsibility.
6. The warranty only applies to the TSMEB and therefore does not cover any plumbing or electrical parts supplied by others and not an integral
part of the TSMEB, e.g. pressure limiting valve; tempering valves; isolation valves; shut off valves; electrical switches; electrical cabling; pumps
or fuse.
7. The benets of this warranty are in addition to other rights and remedies of the consumer under laws in relation to the goods and services to
which the warranty relates.
8. The TSMEB must be sized to supply the hot water in accordance with the guidelines in the ThermoSphere TSMEB literature.
PROCEDURE FOR HONOURING WARRANTY
1. To initiate a claim for a warranty against defects, the consumer shall contact: Thermogroup Ltd T/A ThermoSphere, Bridge House, Pattenden
Lane, Marden, Kent, TN12 9QJ, United Kingdom. [email protected]. 0800 0195899.
2. The process will then follow the ThermoSphere Product Warranty Flow Chart to assess whether the product is under warranty.
WARRANTY EXCLUSIONS
Repair and replacement work will be carried out as set out in the ThermoSphere warranty. However, the following exclusions may cause the
ThermoSphere warranty to become void and may incur a service charge and/or cost of parts:
1. Accidental damage to the TSMEB or any component, including: Acts of God; failure due to misuse, abuse, re or ood damage; incorrect
installation; damage as the result of transportation, removal or storage; attempts to repair the TSMEB other than by a ThermoSphere
Accredited Service Agent, the ThermoSphere Service Department or a repairer not approved by ThermoSphere.
2. Where it is found there is nothing wrong with the TSMEB water heater; where the complaint is related to circumstances where there is no
ow of hot water due to faulty plumbing; where water leaks are related to plumbing and not the TSMEB or TSMEB components; where there
is a failure of electricity or water supplies; where the supply of electricity or water does not comply with relevant standards, codes or acts,
ThermoSphere may then charge the consumer a nominal service charge if inspection reveals no fault with the TSMEB unit or its installation.
3. Where the TSMEB or TSMEB component has failed directly or indirectly as a result of excessive water pressure in excess of 10bar; incorrect
pressure limiting valves; incorrect tempering valve settings; temperature input in excess of 85ºC and/or excessive thermal input; blocked outlet;
corrosive atmosphere; foreign matter in the water supply; or ice formation in the pipe work to or from the TSMEB water heater.
4. Where the TSMEB is located in a position that does not comply with the ThermoSphere TSMEB Installation Instructions or relevant statutory
requirements, causing the need for major dismantling or removal of cupboards, doors or walls, or use of special equipment to bring the
TSMEB to a serviceable position.
5. Repair and/or replacement of the TSMEB due to the effects of either corrosive water or water with a high chloride or low pH level caused by
unnatural circumstances or when the TSMEB has been connected to a water supply with water conductivity levels that are outside the range
of water conductivity outlined in the Installation Instruction Manual.
6. Subject to any rights you have under UK Consumer Law or other statutory provisions to the contrary, this warranty excludes any and all claims
for damage to furniture, carpets, walls, foundations or any other consequential loss either directly or indirectly due to leakage from the water
heater, or due to leakage from ttings and/or pipe work of metal, plastic or other materials caused by water temperature, workmanship or
other.

0800 019 5899 [email protected]
5
Installation checklist
Please read through this guide before commencing installation, to ensure you are familiar with the component parts
the tting procedure and all of the general do‘s and don‘ts.
This unit must be installed by:
• A professional electrician, ensuring installation conforms to all current electrical wiring standards.
• A professional plumber, ensuring installation conforms to all current plumbing standards.
ThermoSphere Micro Electric Boilers (TSMEBs) should preferably be installed in a vertical position on an internal wall,
or in an internal cupboard or space.
If the safety rules or the instructions outlined in this manual are not followed correctly, the unit may not operate
properly and could cause damage to property, serious bodily injury and/or death.
ThermoSphere nor its Distributors will be liable for any damages due to failure to comply with the installation and
operating instructions outlined in this manual or through improper use.
Improper use includes, but is not limited to, the use of this appliance to heat any liquid other than potable water
within the conductivity range specied in this manual. Refer to the general specication on page 9.
Dimensions

0800 019 5899 [email protected]
6
Component guide
This is a guide to all of the components and parts that make up a ThermoSphere Micro Electric Boiler. It will familiarise
you with the component parts of the unit and will assist you during the installation process. Full details for wall
mounting, electrical and plumbing installation are provided in the following sections.
PART No ITEM PART No ITEM
1 TSMEB Chassis 12 TSMEB Wall Mounting Screws 8mm head maximum(Not
included in the packaging).
2 TSMEB Top Cover 13 TSMEB Inlet Filter
3 TSMEB Heat Sink 14 PCB Terminal Block
4 TSMEB Flow Rate Sensor 15 Electric Mains Supply Cable Gland
5TSMEB Temperature Sensor, Receptacle, Cable and Plug
Assembly 16 RED/GREEN LED – TSMEB
(GREEN Ready / RED Error)
6 TSMEB ½” BSP Inlet Water Connection 17 Flow Rate/Temperature Setting Display
7 TSMEB ½” BSP Outlet Water Connection 18 Extension Cover (Optional)
8 TSMEB PCBA V6.2 19 Display PCB, Cable and Plug*
9 TSMEB Earth Locking Mechanism 20 Display PCB *
10 SERIES 1 – TSMEB Exterior Cover (Premium) 21 Reset Button*
11
Pan Phillips Head Self Tapping Screw x 2 – Exterior Cover
Screws Included in the packaging – provided separately
in the small satchel
*Shown on page 14

0800 019 5899 [email protected]
7
Introduction to single and tandem systems
In a single unit installation the TSMEB delivers a
water increase of 25°C at ow rates of between
2.8 to 5.5 litres per minute, depending on the
output of the unit installed.
Single unit installation
2.8 to 5.5 Litres per minute @25°C increase
In a tandem installation the 2 TSMEBs deliver a
water increase of 25°C at ow rates of between
5.6 to 11 litres per minute, depending on the
output of the unit installed.
Tandem unit installation
5.6 to 11.0 Litres per minute @25°C increase
In accordance with HSE recommendations the TSMEB is designed to deliver water up to maximum temperature of 50°C. Water
temperatures above 50°C can cause scalding, Care should be taken with children and vulnerable people.
Failure to comply with the installation and operating instructions or improper use voids the warranty. Never remove the unit cover
unless the electricity is turned off at the isolation switch or switchboard. To reduce the risk of electric shock or injury to persons or
property, please follow the installation instructions carefully.
Where the ambient temperatures are likely to drop below 5°C the unit must be drained of water to prevent frozen water damage
occurring. Failure to comply with the installation and operating instructions or improper use voids the warranty.
Important information and warnings!
Key information on single installations
Model Power
(kW)
Supply
(A)
Supply
cable
Flow L/m
@ +25°C
increase
TSMEB-5 4.8 20 2.5 2.8
TSMEB-6 6.0 25 4.0 3.4
TSMEB-7 7.2 30 4.0 4.1
TSMEB-8 8.4 35 6.0 4.8
TSMEB-10 9.6 40 6.0 5.5
Key information on tandem installations
Model Power
(kW)
Supply
(A)
Total Supply
(A)
Supply
cable
Flow L/m
@ +25°C
increase
TSMEB-5
(x2) 4.8 ea 20 (x2) 40 2.5 5.6
TSMEB-6
(x2) 6.0 ea 25 (x2) 50 4.0 6.8
TSMEB-7
(x2) 7.2 ea 30 (x2) 60 4.0 8.2
TSMEB-8
(x2) 8.4 ea 35 (x2) 70 6.0 9.6
TSMEB-10
x(2) 9.6 ea 40 (x2) 80 6.0 11.0

0800 019 5899 [email protected]
8
Installation options
The suggested installation options show how ThermoSphere Micro Electric Boilers, either single or tandem units, can
be tted in bathrooms, kitchens, to heat pump systems and as a hot water supply to appliances or underoor heating.
Please note that the location and installation of the unit is not limited to the options shown here.
NOTE: When the TSMEB is connected to a washing machine or dishwasher with automatic on/off controlled inlet
valve, a water hammer arrestor must be mounted at the outlet of the TSMEB. This reduces the water hammer effect
during the automatic turning off of the water inlet valve of these appliances.
The TSMEB should preferably be installed in a vertical position on an internal wall, or in an internal cupboard or space.
Direct point of use
The most efcient way to install an TSMEB is as a
direct hot water feed at the point of use. This removes
the need to run cold water pipes and install mixer
taps, as the water comes out of the tap at the desired
temperature.
This type of installation reduces both plumbing
materials and labour. It also eliminates wasted water
and wasted energy by delivering water at the correct
temperature within seconds.
Point of use with cold feeds or mixer taps
TSMEBs can be installed to supply hot water to the hot
outlets or mixer taps in a bathroom.
The TSMEB is connected to the hot outlets and cold
water is connected to the cold outlets.
The user then mixes the hot and cold water as required.
In-line Heat pump backup heater
TSMEBs can be installed as an in-line backup heater
or give heat pump systems an extra boost in very
cold weather.
Underoor heating hot water supply
TSMEBs can be installed as the hot water source for
wet electric underoor heating systems.
TSMEB
Outlet
Hot water out at
pre-set temperature
Hot water comes out
of the single outlet
at the pre-set
temperature
Cold
water in
Shutoff
valve
Pressure
limiting valve
(5 BAR)
Inlet
TSMEB
Outlet
Hot water out at pre-set
temperature
Cold
water in
Shutoff
valve
Pressure limiting
valve (5 BAR)
Inlet
Hot water temp is set high and
can be adjusted by the user
with the mixer tap
TSMEB
HEAT
PUMP
Outlet
Hot water
out to cylinder,
outlets or heating
Warm water
from heat pump
Shutoff
valve
Pressure limiting
valve (5 BAR)
Inlet
Cold
water in
Outlet
Hot water supplied to
UFH with no need for
cold tempering
TSMEB
Filling
loop
Inlet

0800 019 5899 [email protected]
9
Specications
General specications
Switch on ow rate 1.5 litres per minute
Temperature selection 20 - 50°C in 1°C increments.
System type Micro electric boiler - Continuous ow electric water heater
Maximum rated operating pressure 10 bar / 1 MPa / 150 PSI. 5 bar pressure limiting valve required at inlet side
Minimum operating pressure 1.5 bar / 0.15 MPa. Can be operated from mains or pump supply.
Water conductivity range 12.5 kΩ-cm to 1.2 kΩ-cm +15% at 20°C
Dimensions Length 315 mm x Width 210 mm x Depth 120 mm (A4 footprint)
Heating method Optimised Direct Energy Transfer - Digitally controlled water heating
Nominal capacity 385 ml (single unit installation). 2 x 385 ml (tandem installation)
IP Rating IP44. Appliance must be installed inside only.
Ambient temperatures 5°C +. Drain unit if the ambient temperature is likely to drop below 5°C
Standards CE
Warranty 3 years
Electrical specications
Model TSMEB-5 TSMEB-6 TSMEB-7 TSMEB-8 TSMEB-10
Install type Single Tandem Single Tandem Single Tandem Single Tandem Single Tandem
Rated power (kW) 4.8 9.6
(2 x 4.8) 612
(2 x 6) 7.2 14.4
(2 x 7.2) 8.4 16.8
(2 x 8.4) 9.6 19.2
(2 x 9.6)
Flow rate (LPM)
(@25°C temp increase)
2.8 5.6 3.4 6.8 4.1 8.2 4.8 9.6 5.5 11.0
Voltage (V) 240 240 240 240 240 240 240 240 240 240
Power supply (A) 20 2 x 20 25 2 x 25 30 2 x 30 35 2 x 35 40 2 x 40
Supply cable (mm2)
(Method 100 - In contact
with plasterboard, ceiling or
joists, covered by thermal
insulation not exceeding
100mm)
2.5 2.5 4 4 4 4 6 6 6 6
Supply cable (mm2)
(Method 103 - Surrounded
by thermal insulation
including in a stud wall with
thermal insulation with cable
not touching the wall)
4 4 6 6 6 6 10 10 10 10
Frequency (Hz) 50/60 50/60 50/60 50/60 50/60 50/60 50/60 50/60 50/60 50/60

0800 019 5899 [email protected]
10
Important information and warnings!
The incoming water temperature will vary during summer and winter. This may affect the available hot water ow rate. If the water
appears to be luke warm, simply reduce the ow rate out of the outlet until the water reaches the desired temperature.
Water conductivity may be less than 1.25 kΩ-cm. Reduce the ow rate to achieve comfortable water temperature. Water conductivity
greater than 12.5 kΩ+ 15% will generate an error. In this circumstance, the appliance will shut down safely without damage.
Flow rates
Temperature increase
required (°C) TSMEB-5 TSMEB-6 TSMEB-7 TSMEB-8 TSMEB-10
Install type Single Tandem Single Tandem Single Tandem Single Tandem Single Tandem
Max ow rate (Litres
per minute) based on
temperature increase
15°C 4.6 9.2 5.7 11.4 6.9 13.8 8 16 9.2 17
25°C 2.8 5.6 3.4 6.8 4.1 8.2 4.8 9.6 5.5 11
35°C 2 4 2.5 5 2.9 5.8 3.4 6.8 3.9 7.8
45°C 1.5 3 1.9 3.8 2.3 4.6 2.7 5.4 3.1 6.2
Flow rates and energy use with input water at 5°C
Warm water ow rate (Litres per min.) 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0
Deliverable output water temperature (°C) 50.0 50.0 50.0 50.0 42.0 39.5 35.5 32.5
Optimised energy usage (kW) 4.7 6.3 7.8 9.4 9.5 9.6 9.6 9.6
Flow rates and energy use with input water at 10°C
Warm water ow rate (Litres per min.) 1.5 2.0 2.5 3.0 4.0 4.35 4.5 5.0
Deliverable output water temperature (°C) 50.0 50.0 50.0 50.0 45.0 42.0 40.5 37.5
Optimised energy usage (kW) 4.2 5.6 7.0 8.4 9.6 9.6 9.6 9.6
Optimised energy usage
Flow rates
The table below shows the ow rate in litres per minute (LPM), related to deliverable output water temperature (°C)
and optimised electrical energy usage (kW). The table shows you the results that can be achieved by varying the water
ow and temperature.
The optimum operational capability of the unit is shown in GREEN.

0800 019 5899 [email protected]
11
Installation procedure
1. To remove the TSMEB cover, nd a clean at
surface and place the unit on its back. Remove
the 2 screws from the base of the unit with a
cross head screwdriver.
2. Using both your thumbs and forengers, grip the
cover rmly along the bottom of the unit, and push
the cover slowly up to separate it from the body of
the unit.
3. Carefully remove the display PCB/LED plug from the
PCBA.
4. Mount the unit onto the wall. Refer to page 23 of
this manual for the mounting hole template and
page 5 for product dimensions.
5. The electricity supply cable must be brought through
the electric gland from the rear of the appliance.
Connect the supply L/N/E to the correct terminals.
6. Ensure the RCBO and the isolation switch supplying
the 240VAC electrical mains to the TSMEB are turned
OFF.
7. Carefully replace the plug and cable connecting the
display PCB/LED indicator to the PCBA.
8. Connect a water pressure limiting valve (maximum 5.0 bar/72.5 psi/500 kpa) and shutoff valve.
9. Connect the water supply via the shutoff valve and pressure limiting valve to the inlet water connection (BLUE).
NOTE: Flush the cold water line before connecting to the unit.
10. Connect the hot water from the outlet water connection (RED).
11. Run water through the unit without power to ensure there are no leaks.
12. Switch ON the circuit breaker and isolation switch supplying the electric mains power to the unit and check if the
unit turns ON.
If the LED is slowly blinking GREEN, the unit is in standby mode and is ready for use.
Turning hot water on will initiate the heating process and hot water should exit from the point of use water outlet.
When the TSMEB is operating the LED will illuminate as fast blinking GREEN.

0800 019 5899 [email protected]
12
Mounting to the wall
The unit should be mounted vertically onto a solid internal wall, or in an internal cupboard or space. Use the 4 x
mounting screws in the mounting screw hole locations as shown.
Use the screw hole template on page 23 of this guide to easily mark out your xing holes.
The maximum screw head diameter is 8mm. A screw head larger than 8mm will damage the mounting boss and crack
the body.
No holes are to be drilled within the area shown below in RED and the mains supply cable gland tting hole must not
be drilled out. Any holes drilled within these areas, the sides of the unit, or opening out the cable gland tting hole,
will render the unit inoperable and irreparable and will void the product warranty.
ANY DAMAGE TO THE CASING, BODY, GLAND OR MOUNTING BOSS WILL VOID THE WARRANTY.
Make sure your wall and mounting method can continuously support a minimum weight of 10 kg.
When mounting the unit onto a rough surface (ie: a brick wall or similar), a backing board should be mounted to the
wall. The unit can then be mounted onto the backing board. This will allow the cover to be properly tted to the unit.
Mounting
screw holes
Mains supply
cable gland
tting
15
12

0800 019 5899 [email protected]
13
Electrical terminals and connections
1
2
3
4
5
6
Electric supply cable gland
Printed circuit board assembly (PCBA)
Terminal block
Display PCB
PCBA reset button
Display PCB plug and cable
1
2
45
3
6

0800 019 5899 [email protected]
14
Wiring diagrams for single unit installations
Electrical connections for tandem unit installations
All ThermoSphere Micro Electric Boilers must be tted
with their own correctly sized RCBO and an isolation
switch in-line with the xed wiring to the electrical
supply.
Bring the Live, Neutral and Earth from the supply
through the cable gland.
The Live, Neutral and Earth electrical supply
connections must be permanently and correctly
connected to the terminals on the PCBA as shown.
It is the installer‘s responsibility to ensure that the
230V supply circuit can support the total maximum
load of the installed system and that the supply cable,
RCBO and any switches are adequately sized for the
output of the installed TSMEBs.
All wiring connections are polarity dependent.
Incorrect wiring will cause an earth leakage detection
(Error code FC).
With tandem installations, both units must be tted
with their own respective RCBO and an isolation
switch in-line with the xed wiring to each electrical
supply.
It is the installer‘s responsibility to ensure that the
230V supply circuit can support the total maximum
load of the installed system and that the supply cable,
RCBO and any switches are adequately sized for the
output of the TSMEBs.
Bring the Live, Neutral and Earth from the supply
through the cable gland of each unit.
The Live, Neutral and Earth electrical supply
connections must be permanently and correctly
connected to the terminals on the PCBA as shown.
All wiring connections are polarity dependent.
Incorrect wiring will cause an earth leakage detection
(Error code FC).
Single unit wiring
Tandem unit wiring
TSMEB
LN
E
Isolation
switch
30mA
RCBO
230VAC
Supply
TSMEB
LN
E
Isolation
switch
30mA
RCBO
230VAC
Supply
TSMEB
LN
E
Isolation
switch
30mA
RCBO
230VAC
Supply
TSMEB
LN
E
Isolation
switch
30mA
RCBO
230VAC
Supply

0800 019 5899 [email protected]
15
Important information and warnings!
Plumbing connections
The unit is a closed outlet water heater and is intended to operate at the pressure of the water mains, where the ow
of water is controlled by one or more taps or valves in the outlet line.
The unit can be installed into any type of commercial or residential construction as per the current local Plumbing
Standards.
It is mandatory for a water pressure limiting valve and a shutoff valve to be connected in series
with the unit‘s cold water inlet connection.
• The maximum rated operating line pressure is 1 MPA / 10 bar / 145 PSI.
• The minimum operating pressure is atmospheric pressure.
• The installation of a pressure limiting valve (a mandatory requirement) ensures that excess water pressure applied,
as result of water hammer and/or other circumstances, does not stress the appliance unduly.
• The in-line water pressure limiting valve must be rated at 5.0 BAR / 72.5 PSI / 500 KPA.
• The shutoff valve installed must not be a non-return valve.
• If the water heater is supplying a dishwasher or washing machine, a water hammer arrestor must be installed on
the outlet side of the water heater.
Water inlet and outlet connections
The inlet and outlet water connections are both ½”
BSP SERIES GB. There are three options for inlet/outlet
connections with this unit:
Single unit installation Tandem unit installation
1. Braided hose with seal
3. Braided hose without seal
2. Straight copper tube
ThermoSphere nor its Distributors will be liable for any damages caused by failure to comply with the installation and operating
instructions outlined in this manual – specically in this instance where the specied water pressure limiting valve and shutoff
valve type, as indicated, must be installed with this unit. If the unit is supplying a dishwasher or washing machine a water
hammer arrestor must be installed at the outlet side of the unit, failure to do so will void warranty.
TSMEB
Outlet
Hot water
out
Cold
water in
Shutoff
valve
Pressure limiting
valve (5 BAR)
Inlet
TSMEB
Outlet
TSMEB
Stage 1 heated
water
Max 250mm
Stage 2 hot
water out
Cold
water in
Shutoff
valve
Pressure limiting
valve (5 BAR)
Inlet

0800 019 5899 [email protected]
16
Preparation for use
This process must be followed after installation and prior to rst use
ThermoSphere Micro Electric Boilers must be primed after installation and before the rst use.
Priming is also required after the electricity supply to the unit has been turned off or removed, for example after a
power failure or isolation of the electrical supply.
Priming is required to set the unit up for optimal heating ramp-up time and maximum efciency. A correctly primed
TSMEB will ramp up to the optimised power required as efciently as possible without overshoot.
Note: Power overshoot typically occurs in instantaneous water heaters as a result of the maximum output required
to get a heat exchanger up to working temperature as quickly as possible. However, as TSMEBs do not have a heat
exchanger the risk of overshoot is greatly reduced because it does not require a power “kick” at start up.
Your ThermoSphere Micro Electric Boiler is now ready for use!
Step 1: Flush
• Flushing is required to clear the unit of plumbing
debris that may have collected in the piping during
installation.
• This is done with the electric power supply turned off
• Flush water through the unit.
• Flushing should be allowed to continue for at least 2
minutes.
• After ushing remove the inlet lter from the cold
water inlet, clean any debris due to installation and
ushing and ret.
Step 2: Prime
• Turn the electricity supply on and check the LED is slow ashing GREEN. The unit is now in stand-by mode.
• Turn on the hot water outlet to a ow rate greater than 1.5 ltr/min. The unit will start heating.
• Check the LED is fast ashing GREEN and allow the unit to run for at least 3 minutes before closing the outlet.
Automatic air purging during priming
Depending on the initial ow rate during priming, the unit may not start heating until approximately 1.2 Litres of
water has cycled through the unit. This is to ensure that any air in the system has been purged.
You know heating has started as soon as the LED starts fast ashing GREEN. This automatic air purging and priming
will happen whenever the electrical mains power is turned off, to ensure optimum performance.

0800 019 5899 [email protected]
17
Operating instructions
Your ThermoSphere Micro Electric Boiler will
automatically begin operating when you turn on a hot
water tap, and water is owing faster than 1.5 litres per
minute.
The heated water temperature can be set manually by
using the decrease and increase push buttons.
Temperature can be set between a minimum of 20°C and
the maximum of 50°C.
The display also shows water ow rate in litres per
minute (LPM).
The minimum ow rate that can be displayed is 0.1 LPM
and the maximum displayed is 99 LPM.
LED indicators
The LED indicator on the cover indicates the operational
status of the unit.
Slow ashing GREEN
Standby mode. Waiting for water to be turned on.
Flashing alternate RED and GREEN
The unit is self-diagnosing an error that it will
attempt to resolve.
When the error has been resolved, the LED will
return to slow or fast ashing GREEN.
Fast ashing GREEN
Unit is operating and water is being heated.
Flashing RED continuously
Irresolvable error and mechanical lockout. Unit will
no longer operate until the error is cleared. See
error codes on page 19.
This cannot be resolved by switching the unit off
and on again. Manual intervention is required.
If this occurs you should call ThermoSphere to tell
us the error code and we will arrange for a service
technician to help resolve the problem either
remotely or via a site visit if required.
Repair should not be attempted by anyone
without consent from ThermoSphere as this
will void the warranty.
Solid GREEN
The inbound temperature of the water exceeds
the set temperature. No heating required.
Error codes
If the unit experiences some type of malfunction, the
LED indicator will also display an error code.
You will see Er appear in the temperature setting
window and then an alpha-numerical code in the
ow rate window.
For example the image above shows error code A6
which means the outlet water is 5°C above the set
temperature.

0800 019 5899 [email protected]
18
Important information and warnings!
Diagnostics, error codes and descriptions
Maintenance
ThermoSphere Micro Electric Boilers are designed to provide long and reliable service. Actual life expectancy will vary
with water quality and use. The unit itself does not require any regular maintenance.
However, to ensure consistent water ow, it is recommended to periodically remove any scale and dirt that may build
up in the inlet lter, the tap or in the shower head.
Other than the inlet lter, there are no user serviceable parts inside a ThermoSphere Micro Electric Boiler.
In case of an irresolvable or error or mechanical lockout please call ThermoSphere and tell us the error
code. We will arrange for a support technician to try to resolve the issue remotely or via a site visit.
Error code LED display Error description (cause) Error type
N/A OFF No power No error
00 Slow ashing GREEN Standby (normal operation) No error
01 Fast ashing GREEN Heating (normal operation) No error
N/A Solid ORANGE Water conductivity too low No error
N/A Solid ORANGE In priming mode No error
A4 Flashing RED Operating temperature too low Blocking / Resolving
A5 Flashing RED Operating temperature too high Blocking / Resolving
A6 Flashing RED Outlet water temperature 5°C above set point Blocking / Resolving
A7 Flashing RED Inlet cold water input sensor open circuit Blocking / Resolving
A8 Flashing RED Inlet cold water input sensor short circuit Blocking / Resolving
A9 Flashing RED Outlet cold water input sensor open circuit Blocking / Resolving
AA Flashing RED Outlet cold water input sensor short circuit Blocking / Resolving
Ac Flashing RED AC mains electrical supply failure Blocking / Resolving
FA Solid RED High temperature limit exceeded >70°C Mechanical lockout
Fb Solid RED Water conductivity too high Mechanical lockout
Fc Solid RED Earth leakage detection Mechanical lockout
Fd Solid RED CPU watch dog timer error Mechanical lockout
FE Solid RED Temperature control error (A6 >5 times) Mechanical lockout
FF Solid RED Unkown failure Mechanical lockout

0800 019 5899 [email protected]
19
Important information and warnings!
Manual intervention
IMPORTANT! Manual intervention procedure must only be done by an authorised
professional service engineer as the unit must have a LIVE supply to reset.
Some problems can be resolved by resetting the unit. This can be done by following the steps below:
1. Remove the cover and unplug the connecting cable
from the PCB.
The three LED indicators on the PCB will be illuminated
when the unit is in standby, running or in error mode.
2. Press the PCBA reset button.
If the RED LED remains either ashing or illuminated and error condition is still present. There are NO
user serviceable parts, other than the inlet lter, inside the housing so no further action can be taken.
Call for a qualied service electrician to attend site and attempt repair.
If the error has been successfully reset the GREEN LED
on the PCB will start to ash slowly, indicating the unit is
now in standby mode. You can now reconnect the display
PCB cable and replace the exterior cover.

0800 019 5899 [email protected]
20
Important information and warnings!
Product registration
To the installer:
Please ll in both the installer details and product details tables below to ensure that the home or
property owner has all the information they need to register the product and also get technical
help from ThermoSphere should the need arise.
The installer must complete the information on this page and hand a copy to the home owner to keep
for their records. The home owner will require this information in order to register the product and to
make a warranty claim should the need arise. Proof of purchase is also required for warranty claims.
Installer details
Name:
Company:
Email:
Phone:
Address:
Postcode:
Date of installation:
Proof of purchase: Yes / No
Signature:
Product details
Part no Serial no
Supply
circuit max
current
(Amps)
Supply
cable
diameter
(mm)
No. of
taps/
showers
supplied
Incoming
water
temp (°C)
Set water
temp. (°C)
System
ushed
and
primed?
Single or
Tandem
install?
The stock no of the
product. You can
nd this on the label
under the unit.
The serial no of the
product. You can
nd this on the label
under the unit.
What is the max
current of the
RCBO in Amps?
What is the
diameter of the
cable in the
supply circuit?
How many taps,
showers or
other outlets are
supplied?
Use a
thermometer
to measure the
temp of the
water going
into the unit.
What is the water
temperature set on
the control panel
on the front of the
unit?
Has the product
been ushed
and primed
before leaving
site?
Is it a single or
tandem unit
installation?
Yes / No Single /
Tandem
Yes / No Single /
Tandem
Yes / No Single /
Tandem
To the home/property owner:
Use this information to register your
product online at thermosphere.com.
Ensuring you have all of the information
on this page will help with any technical
support that you may need, or a warranty
claim should the need arise.
Scan the QR code or visit:
www.thermosphere.com/water-heating/
micro-electric-boilers/register