THERMAL INNOVATIONS (UK) LTD | THERMAFLOW® ELECTRIC COMBINATION BOILER | Tel: 0870 850 5207
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Checking the concentration of corrosion inhibitor
We would recommend Sentinel X100, or equivalent. Dose appropriately according to the size of the
Thermaflow and central heating system volume combined and in accordance with the inhibitor
manufacturer’s guidelines.
Preventing pump seizure in summer
To prevent seizure of the central heating pump we recommend you turn the central heating on for 30
seconds or so every few weeks throughout the summer.
Seized pumps can usually be freed. The air release on the pump can be completely removed. A small
flat blade screwdriver can be inserted into the slot in the centre and rotated to free the pump.
Checking correct operation of electrical components
WARNING: BEFORE OBTAINING ACCESS TO TERMINALS, ALL SUPPLY CIRCUITS MUST
BE DISCONNECTED.
Low pressure switch
To check correct operation of the low pressure switch, drain some water from the central heating
system until the pressure falls below 0.5 bar, then check continuity between terminals 1 and 3 there
should be no continuity between these terminals. Re pressurise the boiler and re check there is
continuity between the same terminals.
Control and high limit thermostats
Check operation of the control and over temperature thermostats by checking for continuity between
both terminals. (YOU MAY HAVE TO REMOVE THESE THERMOSTATS IF THE BOILER IS STILL
HOLDING HOT WATER. YOU CAN PLACE THE THERMOSTATS IN A BEAKER OF COLD WATER
AND THEN CHECK FOR CONTINUITY ACROSS THE THERMOSTAT).
CONTROL THERMOSTATS; there are four of these thermostats in total, one in each element. The
control thermostats are individually preset and sealed; they should not be tampered with. If a failure on
one of the thermostats has occurred, take note of which element it was removed from and contact
Thermal Innovations (UK) Ltd for spares and advice.
OVER TEMPERATURE THERMOSTATS (Manual reset); there is also four of these, one in each
element. The over temperature thermostats are individually preset and sealed they should not be
tampered with. If a failure on one of the thermostats has occurred, reset the thermostat by pressing the
small reset button on the thermostat. If the thermostat continues to fail in an overheat condition, take
note of which element it was removed from and contact Thermal Innovations (UK) Ltd for spares and
advice.
There is also a non reset-able over temperature thermostat in the top enclosure this is the master over
temperature thermostat, this will break the circuit on over temperature it is preset and sealed and
should not be tampered with. This thermostat is not reset-able and will have to be replaced if it has
incurred an overheat situation). This will indicate a fault has occurred elsewhere and will have to
be investigated and rectified before the appliance is turned back on for use. If a failure has
occurred, contact Thermal Innovations (UK) Ltd for spares and advice.
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