4.9. Membrane controller and bimetallic thermostat
4.9.1. Mode of operation
The membrane controller smoothes the pulses of the coffee/hot water pump and reduces
the pump!s vibration noise.
4.9.2. Replacing the membrane controller
Removing the membrane controller
• Replace defective membrane controller
Detach hose from pump inlet
Use pliers to pull off clamp type clip
Take pump out of rubber holder
Unscrew membrane controller and remove
4.9.3. Bimetallic thermostat
4.9.4. Mode of operation
The bimetallic thermostat prevents the pump from overheating.
Removing the thermostat
• The thermostat is located on the top of the
pump housing
Disconnect cable connectors
Remove thermostat
4.9.5. Technical data
Bimetallic thermostat: Self-resetting (∆115° C)(239° F)
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