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We reserve the right to make technical modifications
Buderus Ltd. • http://www.buderus-domestic.co.uk
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Servicing manual Gas condensing boiler Buderus 500-24/S, 500-24/C and 500-28/C • Issued 02/2006
box 193
z
Check the power supply cable of the 3-way valve for
internal short circuits. The level of electrical resistance,
measured between two wires chosen at random, must be
infinitely high.
box 194
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Insert the power supply plug of the 3-way valve, fit the
DBA control panel and place the boiler into operation,
box 195 Check the internal 3-way valve – drive
mechanism
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Take the boiler out of operation, see box 43, 44 or 47.
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Remove the servomotor of the 3-way valve, see box 182.
box 196
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Check to ensure that the drive mechanism of the 3-way
valve is running smoothly. This is done by gradually
pushing the spring fully home by hand and allowing the
spring to return gradually to its home position.
box 197
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Refit the servomotor, following the above procedure in
reverse order.
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Put the boiler into operation, see box 51, 54 or 55.
box 198 Replace the internal 3-way valve – drive
mechanism
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Take the boiler out of operation and drain the heating
system, see box 48 to 51.
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Remove the servomotor of the 3-way valve, see box 182.
box 199
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Remove the stop spring (item 1) by pulling it in the
direction of the arrow.
box 200
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Remove the drive mechanism (item 1) of the 3-way valve.
A
CAUTION!
Note that water will squirt out when the drive
mechanism is removed.
Have a bucket and a supply of dry cloths to hand.
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