Technical service bulletin
Heat Exchanger Replacement
Bulletin Number: TBG-35 | Model: GB142 series boilers
Heat Exchanger Replacement Procedure
Remove the cable plug from the gas control valve.
Figure 1
Remove both cable plugs [Fig.2, pos.1] from the fan unit.
1
Figure 2
Pull down on both retaining clips [Fig.3, pos.1] to open and
remove the burner cover.
1.
1.
Figure 3
Remove the burner [Fig.4, pos.1].
1
Figure 4
Disconnect the supply [Fig.5, pos.1] and return [Fig.5, pos.2]
sensors.
CAUTION: electrical short circuit
To prevent mix-ups, the supply sensor is marked by a
red sleeve on the side of the cable harness.
1
2
Figure 5
Disconnect the safety sensor [Fig.6, pos.1].
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Figure 6
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