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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 79
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Twist (drawing 1) the fan in the direction of the arrow to
remove (drawing 2).
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Check to see if the fan is soiled or wet.
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Check to see if the fan impeller has come loose at the
motor spindle.
box 80
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Loosen the three screws (item 1) on the gas valve.
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Remove the gas valve (item 2).
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box 81
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Remove the Venturi (item 1).
box 82
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Fit the Venturi to the new fan.
box 83
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Fit the gas valve to the new fan. When doing so, ensure
that the gas injector (item 1) is correctly fitted.
box 84
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Fit the fan to the boiler. Remember to fit the new flat rubber
sealing ring (supplied) when doing so.
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Fit the air silencer tube to the fan.
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Fit the gas supply pipe to the gas valve. Ensure when
doing so that the flat rubber sealing ring is correctly fitted.
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Insert the power supply plug into the gas valve, then insert
the power supply plug and tacho cable plug into the fan.
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Open the gas cock and place the electrical system of the
boiler into operation, see box 59, 54 or 55.
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Carry out a gas-leak check. Check the tightness of all
components that were loosened in the course of
component removal. Use an authorised foam-type leak
detection product for this purpose. If you detect a gas leak,
refer to box 46, 43 or 44.
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Remedy the cause of the gas leak.
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Open the gas cock, place the electrical system of the
boiler into operation and fit the casing, see box 59, 54, 55
or 51.
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