Figure 41
3x 7mm
nuts
11.5 High limit thermostat.
Isolate the electrical supply to the boiler.
Disconnect the thermostat's 'push' on electrical
connections and unscrew the thermostat from its
fitting using a 17mm socket (Fig 42).
Fit replacement thermostat in reverse order, using
heat sink paste to ensure good conductivity.
Figure 42.
11.6 Hot water temperature sensor.
Isolate the electrical supply to the boiler.
Disconnect the sensor's electrical connections and
unscrew the hot water temperature sensor from its
itting using an 8mm spanner (Fig 43). f
Fit the replacement sensor in reverse order.
Figure 43
11.7 Control Unit.
Isolate the electrical supply to the boiler.
Unplug all leads from the control panel. Press the
control panel in, twist anticlockwise, and gently
pull forwards and away (Fig 44).
Fit replacement control panel in reverse order,
checking that correct polarity is maintained on
connection to the mains isolation switch.
Figure 44
Note! The replacement of the following
components requires the boiler to be drained.
For draining the boiler refer to section 9.3 and
section 8.1 for re-fillin
the boiler.
11.8 Pressure sensor.
Isolate the electrical supply to the boiler.
Disconnect the pressure sensor 'push' on electrical
connections. Isolate the central heating flow and
return connections, depressurise and drain the
primary circuit within the boiler. Gently unscrew
the pressure sensor from its fitting by hand (Fig
45).
Fit replacement pressure sensor in reverse order.
Note: Do not overtighten the connection!
ATMOS MULTI Mk 2 version 2004
Page 39
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