THERMAflow Ltd | THERMAFLOW® ELECTRIC COMBINATION BOILER |
Tel: 0870 850 5207
32
One is fitted above the central heating pump and one further up on the boiler. This second stage over
temperature thermostat is pre-set to
90ºC.
It should not be tampered with.
If a failure on one of the thermostats has occurred you can re-set the thermostat by pressing the small
reset button on the thermostat.
If the thermostat continues to fail in an overheat condition a fault may have occurred in one or more of
the control thermostats within the heating elements.
Take note of which one it is and contact Thermaflow Ltd for spares and advice.
The second is also a manual re-set over temperature thermostat and is fitted on the boiler.
This is the 3rd stage manual re-set master over temperature thermostat. It will break the circuit to the
contactor on over temperature.
It is preset to
95ºC
and sealed and
should not be tampered with.
This will indicate a fault has occurred on one or more of the control thermostats within the
heating elements and will have to be investigated.
If it continues to fail in an over-heat condition the fault must be rectified before the appliance is
turned back on for use.
If a failure has occurred, contact Thermaflow Ltd for spares and advice.
3.2.12 Checking the heating elements
Check the resistance between live and neutral terminals on the element.
Replace the element if the resistance is greater than 10 m ohms.
3.2.13 Checking circuit breakers
Switch each circuit breaker off in turn and check that continuity is broken to each element.
3.2.14 Checking the contactor
Turn the main isolator off (this should be situated adjacent to the boiler) you should hear a small click
from the control box marked number
16
on the boiler schematic on
page 9
of this instruction manual.
This indicates that the contactor has disconnected the circuit to the heating elements.
Turn the main isolator on and off a few times and listen for this noise. This will indicate correct operation
of the contactor.
3.2.15 Check the operation of the AQUA STAT
The Aqua Stat is positioned on the cold water inlet entering the boiler.
Make sure
the
external controls
are calling for heat.
Remove the cover and turn the dial on the thermostat up and down and listen for a
small click.
As you turn the thermostat dial up and down check if the central heating pump, (
positioned on the right
side of the unit
) is switching
on
and
off
and do the same with the DHW pump on the left hand side
.
If
this is the case, this indicates correct operation of the thermostat.
