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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 91
Check the pump – activation
H
DANGER OF FATAL ACCIDENT
due to electric shock
A
CAUTION!
To prevent damage, do not insert the measuring
electrodes of the multimeter too far into the holes of the
plug-and-socket connection.
A
CAUTION!
Close gas valve during pump test.
z
Take the boiler out of operation, see box 43, 44 or 47.
box 92
z
Pull out the power supply plug of the pump.
box 93
z
Set the multimeter to “measure AC voltage”.
Minimum measuring range: 250V AC.
z
Put the boiler into operation, see box 54 and 55.
z
Carry out a multimeter check to verify whether 230V AC is
present at both outer contacts (L and N) of the power
supply plug of the pump during locking fault code
[2l]
.
box 94
z
Insert the power supply plug of the pump.
z
box 95
Check the pump – power supply cable
H
DANGER OF FATAL ACCIDENT
due to electric shock
z
Take the boiler out of serve and tip the DBA control panel
forwards, see box 43, 44, 47 or 63.
z
Loosen the six screws and remove the rear section,
z
Remove the power supply plug of the pump, see box 92.
box 96
z
Check the power supply cable of the pump for breaks.
The electrical resistance measured at each individual wire
must be approximately 0
Ω
.
z
Check the power supply cable of the pump for internal
short circuits. The level of electrical resistance, measured
between two wires chosen at random, must be infinitely
high.
z
Fit the power supply plug of the pump, fit the DBA control
panel and place the boiler into operation, see box 53, 54
or 55.
box 97
Check the pump – soiling
z
Take the boiler out of operation and drain the heating
system, see box 43, 44, 47, 45, 49 or 50.
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JP1
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