Boulter Buderus Benchmark 600-28C Installation And Servicing Instruction page 58

5 Servicing
Measure the resistance of the ionisation electrode
(see fig. 92).
Check if the ionisation electrode has been damaged, soiled
or is shows signs of wear (see fig. 93).
Replace ionisation electrode if necessary and reassemble
in reverse order.
5.3.14 Checking the three-way valve for correct operation
Set DHW temperature knob to "0".
Disconnect the boiler from the mains power supply.
Remove the securing pin (see fig. 95, item 1) and remove
the servomotor.
Connect the boiler to the mains power supply.
Set the DHW temperature knob on the BC10 to 60 °C.
Open a warm water faucet.
Check if the servomotor of the internal three way valve is
turning to the DHW position.
Set the DHW temperature knob to "0".
Close the warm water faucet.
Check if the servomotor of the internal three-way valve
turns to the central heating position.
Subject to modifications resulting from technical improvements!
58 Installation and maintenance instructions for wall-mounted condensing gas boiler 600 - 28C • 01/2004
fig. 92 Measure resistance ionisation electrode
fig. 93 Check ionisation electrode
fig. 94 Checking the three-way valve for correct operation
Boulter Buderus Ltd. • http://www.boulter-boilers.com