Atmos Energy INTERCOMBI HE32 - Manual (Page 53)

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9.2.11 Pump head
Disconnect the pump wires from the controller (see note in § 9.2.1).
Undo two Allen bolts on the Wilo pump head (alternative pump
Grundfos has 4 Allen bolts) to remove the pump head from the body.
Fit replacement pump head in reverse order. The pump must be
vented via its vent plug after refilling the appliance.
9.2.12 Expansion vessel
Unscrew the flexible hose connection, making sure that the sealing
ring is not damaged. Unclip the bracket holding the vessel and fit
replacement including the sealing ring. Using the Schroeder valve on
the expansion vessel, and pump if required, check the pressure is 1
bar.