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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 161 Check the gas valve – power supply plug
z
Take the boiler out of operation, see box 43, 44 or 47.
box 162
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Check to ensure that the power supply plug (item 1) has
been inserted correctly into the gas valve.
box 163
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Put the boiler into operation, see
box 164 Check the gas valve – activation
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Take the boiler out of operation, see box 43, 44 or 47.
box 165
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Run the boiler at full load, see box 54, 55 and
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Set the multimeter to “measure DC voltage”.
Minimum measuring range: 40V DC.
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Check to see if the gas valve has been activated. During
operating code
C [0l]
, or somewhat later, 20 – 24V DC
must be detectable at both the centre and upper contacts
(item 1 and 2).
box 166
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Put the boiler into operation, see box 51, 54 or 55.
box 167 Check gas valve – electrical resistance of
power supply cable
z
Take the boiler out of operation and remove the DBA
control panel, see box 43, 44, 47, 63 or 70.
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1
2
box 168
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Remove the plug from the gas valve (item 1).
box 169
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Set multimeter to “measure resistance”.
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Check the power supply cable of the gas valve for breaks.
The electrical resistance measured at each individual wire
must be approximately 0
Ω
.
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Check the power supply cable of the gas valve for internal
short circuits. The level of electrical resistance, measured
between two wires, must be infinitely high.
box 170
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Insert the gas valve plug.
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Fit the DBA control panel and place the boiler into
operation, see box 51, 54 or 55.
box 171 Check the gas valve – internal electrical
resistance
z
Take the boiler out of operation, see
box 43, 44 or 47.
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Remove the power supply plug of the gas valve,
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2
JP4
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