7219717 - 02 (08/15)
EcoBlue Heat
51
Maintenance
10
Removal of the fan air duct and flue outlet duct is
necessary to enable the changing of the pressure
switch, flow temperature sensor, return temperature
sensor, overheat sensor and gas valve.
10.3.4 Removal of Ducts
(Fig. 42)
1. Remove the air duct by pulling the bottom of the duct forward
to disengage it from the gas valve and then sliding the top of the
duct left away from the fan.
2. Disengage the clip at the top of the flue duct, pull the duct
forwards and then manoeuvre it out of the heat exchanger
sump connection.
10.3.5 Pressure Switch (21 & 24 only)
(Fig. 43)
1. Disconnect the pressure switch wiring from the overheat
sensor wiring harness.
2. Depress the retaining latch to release the pressure switch
pull to the right and remove it from the top flue duct tube.
3. Fit the new pressure switch, ensuring the ‘O’ ring is in place
on the lower spigot and reconnect to the wiring harness from
the overheat sensor.
10.3.6 “Socket & See” Electrical Test Point
(Fig. 43a)
1. Disconnect the test point wiring from the mains 3 core cable.
2. Disengage the fan protective cover securing tab and lower
the cover sufficiently to allow the test point wiring to be
disconnected from the PCB.
3. Draw the test point forwards off the cover.
4. Fit the new test point and reassemble in reverse order.
Fan Air
Duct
Flue Outlet
Duct
Flue Clip
Slide Pressure Switch away from
Top Flue Duct Tube
Pressure Switch
Retaining Latch
Disconnect from Overheat
Sensor Harness
Top Flue
Duct Tube
Fig. 42
Fig. 43
Fig. 43a
Draw Test Point forwards off
Cover after disconnecting
wiring